Merge branch 'clk-next' of git://git.linaro.org/people/mturquette/linux into next/clock

* 'clk-next' of git://git.linaro.org/people/mturquette/linux:
  clk: Fix CLK_SET_RATE_GATE flag validation in clk_set_rate().
  clk: Provide dummy clk_unregister()
  ARM: Kirkwood: Replace clock gating
  ARM: Orion: Audio: Add clk/clkdev support
  ARM: Orion: PCIE: Add support for clk
  ARM: Orion: XOR: Add support for clk
  ARM: Orion: CESA: Add support for clk
  ARM: Orion: SDIO: Add support for clk.
  ARM: Orion: NAND: Add support for clk, if there is one.
  ARM: Orion: EHCI: Add support for enabling clocks
  ARM: Orion: SATA: Add per channel clk/clkdev support.
  ARM: Orion: UART: Get the clock rate via clk_get_rate().
  ARM: Orion: WDT: Add clk/clkdev support
  ARM: Orion: Eth: Add clk/clkdev support.
  ARM: Orion: SPI: Add clk/clkdev support.
  ARM: Orion: Add clocks using the generic clk infrastructure.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

36 files changed, 585 insertions, 264 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f0fc52784ebc..0a166b52600d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1142,6 +1142,7 @@ config PLAT_ORION
         bool
         select CLKSRC_MMIO
         select GENERIC_IRQ_CHIP
+        select COMMON_CLK
 
 config PLAT_PXA
         bool
diff --git a/arch/arm/mach-dove/common.c b/arch/arm/mach-dove/common.c
index bda7aca04ca0..0ab0f81b661d 100644
--- a/arch/arm/mach-dove/common.c
+++ b/arch/arm/mach-dove/common.c
@@ -13,7 +13,7 @@
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/pci.h>
-#include <linux/clk.h>
+#include <linux/clk-provider.h>
 #include <linux/ata_platform.h>
 #include <linux/gpio.h>
 #include <asm/page.h>
@@ -68,6 +68,19 @@ void __init dove_map_io(void)
 }
 
 /*****************************************************************************
+ * CLK tree
+ ****************************************************************************/
+static struct clk *tclk;
+
+static void __init clk_init(void)
+{
+        tclk = clk_register_fixed_rate(NULL, "tclk", NULL, CLK_IS_ROOT,
+                                       get_tclk());
+
+        orion_clkdev_init(tclk);
+}
+
+/*****************************************************************************
  * EHCI0
  ****************************************************************************/
 void __init dove_ehci0_init(void)
@@ -89,8 +102,7 @@ void __init dove_ehci1_init(void)
 void __init dove_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
         orion_ge00_init(eth_data,
-                        DOVE_GE00_PHYS_BASE, IRQ_DOVE_GE00_SUM,
-                        0, get_tclk());
+                        DOVE_GE00_PHYS_BASE, IRQ_DOVE_GE00_SUM, 0);
 }
 
 /*****************************************************************************
@@ -116,7 +128,7 @@ void __init dove_sata_init(struct mv_sata_platform_data *sata_data)
 void __init dove_uart0_init(void)
 {
         orion_uart0_init(DOVE_UART0_VIRT_BASE, DOVE_UART0_PHYS_BASE,
-                         IRQ_DOVE_UART_0, get_tclk());
+                         IRQ_DOVE_UART_0, tclk);
 }
 
 /*****************************************************************************
@@ -125,7 +137,7 @@ void __init dove_uart0_init(void)
 void __init dove_uart1_init(void)
 {
         orion_uart1_init(DOVE_UART1_VIRT_BASE, DOVE_UART1_PHYS_BASE,
-                         IRQ_DOVE_UART_1, get_tclk());
+                         IRQ_DOVE_UART_1, tclk);
 }
 
 /*****************************************************************************
@@ -134,7 +146,7 @@ void __init dove_uart1_init(void)
 void __init dove_uart2_init(void)
 {
         orion_uart2_init(DOVE_UART2_VIRT_BASE, DOVE_UART2_PHYS_BASE,
-                         IRQ_DOVE_UART_2, get_tclk());
+                         IRQ_DOVE_UART_2, tclk);
 }
 
 /*****************************************************************************
@@ -143,7 +155,7 @@ void __init dove_uart2_init(void)
 void __init dove_uart3_init(void)
 {
         orion_uart3_init(DOVE_UART3_VIRT_BASE, DOVE_UART3_PHYS_BASE,
-                         IRQ_DOVE_UART_3, get_tclk());
+                         IRQ_DOVE_UART_3, tclk);
 }
 
 /*****************************************************************************
@@ -151,12 +163,12 @@ void __init dove_uart3_init(void)
  ****************************************************************************/
 void __init dove_spi0_init(void)
 {
-        orion_spi_init(DOVE_SPI0_PHYS_BASE, get_tclk());
+        orion_spi_init(DOVE_SPI0_PHYS_BASE);
 }
 
 void __init dove_spi1_init(void)
 {
-        orion_spi_1_init(DOVE_SPI1_PHYS_BASE, get_tclk());
+        orion_spi_1_init(DOVE_SPI1_PHYS_BASE);
 }
 
 /*****************************************************************************
@@ -272,18 +284,17 @@ void __init dove_sdio1_init(void)
 
 void __init dove_init(void)
 {
-        int tclk;
-
-        tclk = get_tclk();
-
         printk(KERN_INFO "Dove 88AP510 SoC, ");
-        printk(KERN_INFO "TCLK = %dMHz\n", (tclk + 499999) / 1000000);
+        printk(KERN_INFO "TCLK = %dMHz\n", (get_tclk() + 499999) / 1000000);
 
 #ifdef CONFIG_CACHE_TAUROS2
         tauros2_init();
 #endif
         dove_setup_cpu_mbus();
 
+        /* Setup root of clk tree */
+        clk_init();
+
         /* internal devices that every board has */
         dove_rtc_init();
         dove_xor0_init();
diff --git a/arch/arm/mach-dove/dove-db-setup.c b/arch/arm/mach-dove/dove-db-setup.c
index ea77ae430b2d..bc2867f11346 100644
--- a/arch/arm/mach-dove/dove-db-setup.c
+++ b/arch/arm/mach-dove/dove-db-setup.c
@@ -20,7 +20,6 @@
 #include <linux/i2c.h>
 #include <linux/pci.h>
 #include <linux/spi/spi.h>
-#include <linux/spi/orion_spi.h>
 #include <linux/spi/flash.h>
 #include <linux/gpio.h>
 #include <asm/mach-types.h>
diff --git a/arch/arm/mach-kirkwood/board-dreamplug.c b/arch/arm/mach-kirkwood/board-dreamplug.c
index 985453994dd3..55e357ab2923 100644
--- a/arch/arm/mach-kirkwood/board-dreamplug.c
+++ b/arch/arm/mach-kirkwood/board-dreamplug.c
@@ -27,7 +27,6 @@
 #include <linux/mtd/physmap.h>
 #include <linux/spi/flash.h>
 #include <linux/spi/spi.h>
-#include <linux/spi/orion_spi.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
diff --git a/arch/arm/mach-kirkwood/board-dt.c b/arch/arm/mach-kirkwood/board-dt.c
index 1c672d9e6656..87856b5a397d 100644
--- a/arch/arm/mach-kirkwood/board-dt.c
+++ b/arch/arm/mach-kirkwood/board-dt.c
@@ -42,6 +42,9 @@ static void __init kirkwood_dt_init(void)
         kirkwood_l2_init();
 #endif
 
+        /* Setup root of clk tree */
+        kirkwood_clk_init();
+
         /* internal devices that every board has */
         kirkwood_wdt_init();
         kirkwood_xor0_init();
diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index a02cae881f2f..25fb3fd418ef 100644
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -15,6 +15,8 @@
 #include <linux/ata_platform.h>
 #include <linux/mtd/nand.h>
 #include <linux/dma-mapping.h>
+#include <linux/clk-provider.h>
+#include <linux/spinlock.h>
 #include <net/dsa.h>
 #include <asm/page.h>
 #include <asm/timex.h>
@@ -31,6 +33,7 @@
 #include <plat/common.h>
 #include <plat/time.h>
 #include <plat/addr-map.h>
+#include <plat/mv_xor.h>
 #include "common.h"
 
 /*****************************************************************************
@@ -60,20 +63,188 @@ void __init kirkwood_map_io(void)
         iotable_init(kirkwood_io_desc, ARRAY_SIZE(kirkwood_io_desc));
 }
 
-/*
- * Default clock control bits.  Any bit _not_ set in this variable
- * will be cleared from the hardware after platform devices have been
- * registered.  Some reserved bits must be set to 1.
- */
-unsigned int kirkwood_clk_ctrl = CGC_DUNIT | CGC_RESERVED;
+/*****************************************************************************
+ * CLK tree
+ ****************************************************************************/
+
+static void disable_sata0(void)
+{
+        /* Disable PLL and IVREF */
+        writel(readl(SATA0_PHY_MODE_2) & ~0xf, SATA0_PHY_MODE_2);
+        /* Disable PHY */
+        writel(readl(SATA0_IF_CTRL) | 0x200, SATA0_IF_CTRL);
+}
+
+static void disable_sata1(void)
+{
+        /* Disable PLL and IVREF */
+        writel(readl(SATA1_PHY_MODE_2) & ~0xf, SATA1_PHY_MODE_2);
+        /* Disable PHY */
+        writel(readl(SATA1_IF_CTRL) | 0x200, SATA1_IF_CTRL);
+}
+
+static void disable_pcie0(void)
+{
+        writel(readl(PCIE_LINK_CTRL) | 0x10, PCIE_LINK_CTRL);
+        while (1)
+                if (readl(PCIE_STATUS) & 0x1)
+                        break;
+        writel(readl(PCIE_LINK_CTRL) & ~0x10, PCIE_LINK_CTRL);
+}
+
+static void disable_pcie1(void)
+{
+        u32 dev, rev;
+
+        kirkwood_pcie_id(&dev, &rev);
+
+        if (dev == MV88F6282_DEV_ID) {
+                writel(readl(PCIE1_LINK_CTRL) | 0x10, PCIE1_LINK_CTRL);
+                while (1)
+                        if (readl(PCIE1_STATUS) & 0x1)
+                                break;
+                writel(readl(PCIE1_LINK_CTRL) & ~0x10, PCIE1_LINK_CTRL);
+        }
+}
+
+/* An extended version of the gated clk. This calls fn() before
+ * disabling the clock. We use this to turn off PHYs etc. */
+struct clk_gate_fn {
+        struct clk_gate gate;
+        void (*fn)(void);
+};
 
+#define to_clk_gate_fn(_gate) container_of(_gate, struct clk_gate_fn, gate)
+#define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
+
+static void clk_gate_fn_disable(struct clk_hw *hw)
+{
+        struct clk_gate *gate = to_clk_gate(hw);
+        struct clk_gate_fn *gate_fn = to_clk_gate_fn(gate);
+
+        if (gate_fn->fn)
+                gate_fn->fn();
+
+        clk_gate_ops.disable(hw);
+}
+
+static struct clk_ops clk_gate_fn_ops;
+
+static struct clk __init *clk_register_gate_fn(struct device *dev,
+                const char *name,
+                const char *parent_name, unsigned long flags,
+                void __iomem *reg, u8 bit_idx,
+                u8 clk_gate_flags, spinlock_t *lock,
+                void (*fn)(void))
+{
+        struct clk_gate_fn *gate_fn;
+        struct clk *clk;
+        struct clk_init_data init;
+
+        gate_fn = kzalloc(sizeof(struct clk_gate_fn), GFP_KERNEL);
+        if (!gate_fn) {
+                pr_err("%s: could not allocate gated clk\n", __func__);
+                return ERR_PTR(-ENOMEM);
+        }
+
+        init.name = name;
+        init.ops = &clk_gate_fn_ops;
+        init.flags = flags;
+        init.parent_names = (parent_name ? &parent_name : NULL);
+        init.num_parents = (parent_name ? 1 : 0);
+
+        /* struct clk_gate assignments */
+        gate_fn->gate.reg = reg;
+        gate_fn->gate.bit_idx = bit_idx;
+        gate_fn->gate.flags = clk_gate_flags;
+        gate_fn->gate.lock = lock;
+        gate_fn->gate.hw.init = &init;
+
+        /* ops is the gate ops, but with our disable function */
+        if (clk_gate_fn_ops.disable != clk_gate_fn_disable) {
+                clk_gate_fn_ops = clk_gate_ops;
+                clk_gate_fn_ops.disable = clk_gate_fn_disable;
+        }
+
+        clk = clk_register(dev, &gate_fn->gate.hw);
+
+        if (IS_ERR(clk))
+                kfree(gate_fn);
+
+        return clk;
+}
+
+static DEFINE_SPINLOCK(gating_lock);
+static struct clk *tclk;
+
+static struct clk __init *kirkwood_register_gate(const char *name, u8 bit_idx)
+{
+        return clk_register_gate(NULL, name, "tclk", 0,
+                                 (void __iomem *)CLOCK_GATING_CTRL,
+                                 bit_idx, 0, &gating_lock);
+}
+
+static struct clk __init *kirkwood_register_gate_fn(const char *name,
+                                                    u8 bit_idx,
+                                                    void (*fn)(void))
+{
+        return clk_register_gate_fn(NULL, name, "tclk", 0,
+                                    (void __iomem *)CLOCK_GATING_CTRL,
+                                    bit_idx, 0, &gating_lock, fn);
+}
+
+void __init kirkwood_clk_init(void)
+{
+        struct clk *runit, *ge0, *ge1, *sata0, *sata1, *usb0, *sdio;
+        struct clk *crypto, *xor0, *xor1, *pex0, *pex1, *audio;
+
+        tclk = clk_register_fixed_rate(NULL, "tclk", NULL,
+                                       CLK_IS_ROOT, kirkwood_tclk);
+
+        runit = kirkwood_register_gate("runit",  CGC_BIT_RUNIT);
+        ge0 = kirkwood_register_gate("ge0",    CGC_BIT_GE0);
+        ge1 = kirkwood_register_gate("ge1",    CGC_BIT_GE1);
+        sata0 = kirkwood_register_gate_fn("sata0",  CGC_BIT_SATA0,
+                                          disable_sata0);
+        sata1 = kirkwood_register_gate_fn("sata1",  CGC_BIT_SATA1,
+                                          disable_sata1);
+        usb0 = kirkwood_register_gate("usb0",   CGC_BIT_USB0);
+        sdio = kirkwood_register_gate("sdio",   CGC_BIT_SDIO);
+        crypto = kirkwood_register_gate("crypto", CGC_BIT_CRYPTO);
+        xor0 = kirkwood_register_gate("xor0",   CGC_BIT_XOR0);
+        xor1 = kirkwood_register_gate("xor1",   CGC_BIT_XOR1);
+        pex0 = kirkwood_register_gate_fn("pex0",   CGC_BIT_PEX0,
+                                         disable_pcie0);
+        pex1 = kirkwood_register_gate_fn("pex1",   CGC_BIT_PEX1,
+                                         disable_pcie1);
+        audio = kirkwood_register_gate("audio",  CGC_BIT_AUDIO);
+        kirkwood_register_gate("tdm",    CGC_BIT_TDM);
+        kirkwood_register_gate("tsu",    CGC_BIT_TSU);
+
+        /* clkdev entries, mapping clks to devices */
+        orion_clkdev_add(NULL, "orion_spi.0", runit);
+        orion_clkdev_add(NULL, "orion_spi.1", runit);
+        orion_clkdev_add(NULL, MV643XX_ETH_NAME ".0", ge0);
+        orion_clkdev_add(NULL, MV643XX_ETH_NAME ".1", ge1);
+        orion_clkdev_add(NULL, "orion_wdt", tclk);
+        orion_clkdev_add("0", "sata_mv.0", sata0);
+        orion_clkdev_add("1", "sata_mv.0", sata1);
+        orion_clkdev_add(NULL, "orion-ehci.0", usb0);
+        orion_clkdev_add(NULL, "orion_nand", runit);
+        orion_clkdev_add(NULL, "mvsdio", sdio);
+        orion_clkdev_add(NULL, "mv_crypto", crypto);
+        orion_clkdev_add(NULL, MV_XOR_SHARED_NAME ".0", xor0);
+        orion_clkdev_add(NULL, MV_XOR_SHARED_NAME ".1", xor1);
+        orion_clkdev_add("0", "pcie", pex0);
+        orion_clkdev_add("1", "pcie", pex1);
+        orion_clkdev_add(NULL, "kirkwood-i2s", audio);
+}
 
 /*****************************************************************************
  * EHCI0
  ****************************************************************************/
 void __init kirkwood_ehci_init(void)
 {
-        kirkwood_clk_ctrl |= CGC_USB0;
         orion_ehci_init(USB_PHYS_BASE, IRQ_KIRKWOOD_USB, EHCI_PHY_NA);
 }
 
@@ -83,11 +254,9 @@ void __init kirkwood_ehci_init(void)
  ****************************************************************************/
 void __init kirkwood_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
-        kirkwood_clk_ctrl |= CGC_GE0;
-
         orion_ge00_init(eth_data,
                         GE00_PHYS_BASE, IRQ_KIRKWOOD_GE00_SUM,
-                        IRQ_KIRKWOOD_GE00_ERR, kirkwood_tclk);
+                        IRQ_KIRKWOOD_GE00_ERR);
 }
 
 
@@ -96,12 +265,9 @@ void __init kirkwood_ge00_init(struct mv643xx_eth_platform_data *eth_data)
  ****************************************************************************/
 void __init kirkwood_ge01_init(struct mv643xx_eth_platform_data *eth_data)
 {
-
-        kirkwood_clk_ctrl |= CGC_GE1;
-
         orion_ge01_init(eth_data,
                         GE01_PHYS_BASE, IRQ_KIRKWOOD_GE01_SUM,
-                        IRQ_KIRKWOOD_GE01_ERR, kirkwood_tclk);
+                        IRQ_KIRKWOOD_GE01_ERR);
 }
 
 
@@ -143,7 +309,6 @@ static struct platform_device kirkwood_nand_flash = {
 void __init kirkwood_nand_init(struct mtd_partition *parts, int nr_parts,
                                int chip_delay)
 {
-        kirkwood_clk_ctrl |= CGC_RUNIT;
         kirkwood_nand_data.parts = parts;
         kirkwood_nand_data.nr_parts = nr_parts;
         kirkwood_nand_data.chip_delay = chip_delay;
@@ -153,7 +318,6 @@ void __init kirkwood_nand_init(struct mtd_partition *parts, int nr_parts,
 void __init kirkwood_nand_init_rnb(struct mtd_partition *parts, int nr_parts,
                                    int (*dev_ready)(struct mtd_info *))
 {
-        kirkwood_clk_ctrl |= CGC_RUNIT;
         kirkwood_nand_data.parts = parts;
         kirkwood_nand_data.nr_parts = nr_parts;
         kirkwood_nand_data.dev_ready = dev_ready;
@@ -174,10 +338,6 @@ static void __init kirkwood_rtc_init(void)
  ****************************************************************************/
 void __init kirkwood_sata_init(struct mv_sata_platform_data *sata_data)
 {
-        kirkwood_clk_ctrl |= CGC_SATA0;
-        if (sata_data->n_ports > 1)
-                kirkwood_clk_ctrl |= CGC_SATA1;
-
         orion_sata_init(sata_data, SATA_PHYS_BASE, IRQ_KIRKWOOD_SATA);
 }
 
@@ -220,7 +380,6 @@ void __init kirkwood_sdio_init(struct mvsdio_platform_data *mvsdio_data)
                 mvsdio_data->clock = 100000000;
         else
                 mvsdio_data->clock = 200000000;
-        kirkwood_clk_ctrl |= CGC_SDIO;
         kirkwood_sdio.dev.platform_data = mvsdio_data;
         platform_device_register(&kirkwood_sdio);
 }
@@ -231,8 +390,7 @@ void __init kirkwood_sdio_init(struct mvsdio_platform_data *mvsdio_data)
  ****************************************************************************/
 void __init kirkwood_spi_init()
 {
-        kirkwood_clk_ctrl |= CGC_RUNIT;
-        orion_spi_init(SPI_PHYS_BASE, kirkwood_tclk);
+        orion_spi_init(SPI_PHYS_BASE);
 }
 
 
@@ -252,7 +410,7 @@ void __init kirkwood_i2c_init(void)
 void __init kirkwood_uart0_init(void)
 {
         orion_uart0_init(UART0_VIRT_BASE, UART0_PHYS_BASE,
-                         IRQ_KIRKWOOD_UART_0, kirkwood_tclk);
+                         IRQ_KIRKWOOD_UART_0, tclk);
 }
 
 
@@ -262,7 +420,7 @@ void __init kirkwood_uart0_init(void)
 void __init kirkwood_uart1_init(void)
 {
         orion_uart1_init(UART1_VIRT_BASE, UART1_PHYS_BASE,
-                         IRQ_KIRKWOOD_UART_1, kirkwood_tclk);
+                         IRQ_KIRKWOOD_UART_1, tclk);
 }
 
 /*****************************************************************************
@@ -270,7 +428,6 @@ void __init kirkwood_uart1_init(void)
  ****************************************************************************/
 void __init kirkwood_crypto_init(void)
 {
-        kirkwood_clk_ctrl |= CGC_CRYPTO;
         orion_crypto_init(CRYPTO_PHYS_BASE, KIRKWOOD_SRAM_PHYS_BASE,
                           KIRKWOOD_SRAM_SIZE, IRQ_KIRKWOOD_CRYPTO);
 }
@@ -281,8 +438,6 @@ void __init kirkwood_crypto_init(void)
  ****************************************************************************/
 void __init kirkwood_xor0_init(void)
 {
-        kirkwood_clk_ctrl |= CGC_XOR0;
-
         orion_xor0_init(XOR0_PHYS_BASE, XOR0_HIGH_PHYS_BASE,
                         IRQ_KIRKWOOD_XOR_00, IRQ_KIRKWOOD_XOR_01);
 }
@@ -293,8 +448,6 @@ void __init kirkwood_xor0_init(void)
  ****************************************************************************/
 void __init kirkwood_xor1_init(void)
 {
-        kirkwood_clk_ctrl |= CGC_XOR1;
-
         orion_xor1_init(XOR1_PHYS_BASE, XOR1_HIGH_PHYS_BASE,
                         IRQ_KIRKWOOD_XOR_10, IRQ_KIRKWOOD_XOR_11);
 }
@@ -305,7 +458,7 @@ void __init kirkwood_xor1_init(void)
  ****************************************************************************/
 void __init kirkwood_wdt_init(void)
 {
-        orion_wdt_init(kirkwood_tclk);
+        orion_wdt_init();
 }
 
 
@@ -381,7 +534,6 @@ static struct platform_device kirkwood_pcm_device = {
 
 void __init kirkwood_audio_init(void)
 {
-        kirkwood_clk_ctrl |= CGC_AUDIO;
         platform_device_register(&kirkwood_i2s_device);
         platform_device_register(&kirkwood_pcm_device);
 }
@@ -465,6 +617,9 @@ void __init kirkwood_init(void)
         kirkwood_l2_init();
 #endif
 
+        /* Setup root of clk tree */
+        kirkwood_clk_init();
+
         /* internal devices that every board has */
         kirkwood_rtc_init();
         kirkwood_wdt_init();
@@ -477,61 +632,6 @@ void __init kirkwood_init(void)
 #endif
 }
 
-static int __init kirkwood_clock_gate(void)
-{
-        unsigned int curr = readl(CLOCK_GATING_CTRL);
-        u32 dev, rev;
-
-        kirkwood_pcie_id(&dev, &rev);
-        printk(KERN_DEBUG "Gating clock of unused units\n");
-        printk(KERN_DEBUG "before: 0x%08x\n", curr);
-
-        /* Make sure those units are accessible */
-        writel(curr | CGC_SATA0 | CGC_SATA1 | CGC_PEX0 | CGC_PEX1, CLOCK_GATING_CTRL);
-
-        /* For SATA: first shutdown the phy */
-        if (!(kirkwood_clk_ctrl & CGC_SATA0)) {
-                /* Disable PLL and IVREF */
-                writel(readl(SATA0_PHY_MODE_2) & ~0xf, SATA0_PHY_MODE_2);
-                /* Disable PHY */
-                writel(readl(SATA0_IF_CTRL) | 0x200, SATA0_IF_CTRL);
-        }
-        if (!(kirkwood_clk_ctrl & CGC_SATA1)) {
-                /* Disable PLL and IVREF */
-                writel(readl(SATA1_PHY_MODE_2) & ~0xf, SATA1_PHY_MODE_2);
-                /* Disable PHY */
-                writel(readl(SATA1_IF_CTRL) | 0x200, SATA1_IF_CTRL);
-        }
-        
-        /* For PCIe: first shutdown the phy */
-        if (!(kirkwood_clk_ctrl & CGC_PEX0)) {
-                writel(readl(PCIE_LINK_CTRL) | 0x10, PCIE_LINK_CTRL);
-                while (1)
-                        if (readl(PCIE_STATUS) & 0x1)
-                                break;
-                writel(readl(PCIE_LINK_CTRL) & ~0x10, PCIE_LINK_CTRL);
-        }
-
-        /* For PCIe 1: first shutdown the phy */
-        if (dev == MV88F6282_DEV_ID) {
-                if (!(kirkwood_clk_ctrl & CGC_PEX1)) {
-                        writel(readl(PCIE1_LINK_CTRL) | 0x10, PCIE1_LINK_CTRL);
-                        while (1)
-                                if (readl(PCIE1_STATUS) & 0x1)
-                                        break;
-                        writel(readl(PCIE1_LINK_CTRL) & ~0x10, PCIE1_LINK_CTRL);
-                }
-        } else  /* keep this bit set for devices that don't have PCIe1 */
-                kirkwood_clk_ctrl |= CGC_PEX1;
-
-        /* Now gate clock the required units */
-        writel(kirkwood_clk_ctrl, CLOCK_GATING_CTRL);
-        printk(KERN_DEBUG " after: 0x%08x\n", readl(CLOCK_GATING_CTRL));
-
-        return 0;
-}
-late_initcall(kirkwood_clock_gate);
-
 void kirkwood_restart(char mode, const char *cmd)
 {
         /*
diff --git a/arch/arm/mach-kirkwood/common.h b/arch/arm/mach-kirkwood/common.h
index fa8e7689c436..0729b11a3e2a 100644
--- a/arch/arm/mach-kirkwood/common.h
+++ b/arch/arm/mach-kirkwood/common.h
@@ -50,6 +50,7 @@ void kirkwood_nand_init(struct mtd_partition *parts, int nr_parts, int delay);
 void kirkwood_nand_init_rnb(struct mtd_partition *parts, int nr_parts, int (*dev_ready)(struct mtd_info *));
 void kirkwood_audio_init(void);
 void kirkwood_restart(char, const char *);
+void kirkwood_clk_init(void);
 
 /* board init functions for boards not fully converted to fdt */
 #ifdef CONFIG_MACH_DREAMPLUG_DT
diff --git a/arch/arm/mach-kirkwood/include/mach/bridge-regs.h b/arch/arm/mach-kirkwood/include/mach/bridge-regs.h
index 957bd7997d7e..3eee37a3b501 100644
--- a/arch/arm/mach-kirkwood/include/mach/bridge-regs.h
+++ b/arch/arm/mach-kirkwood/include/mach/bridge-regs.h
@@ -43,6 +43,22 @@
 #define L2_WRITETHROUGH         0x00000010
 
 #define CLOCK_GATING_CTRL       (BRIDGE_VIRT_BASE | 0x11c)
+#define CGC_BIT_GE0             (0)
+#define CGC_BIT_PEX0            (2)
+#define CGC_BIT_USB0            (3)
+#define CGC_BIT_SDIO            (4)
+#define CGC_BIT_TSU             (5)
+#define CGC_BIT_DUNIT           (6)
+#define CGC_BIT_RUNIT           (7)
+#define CGC_BIT_XOR0            (8)
+#define CGC_BIT_AUDIO           (9)
+#define CGC_BIT_SATA0           (14)
+#define CGC_BIT_SATA1           (15)
+#define CGC_BIT_XOR1            (16)
+#define CGC_BIT_CRYPTO          (17)
+#define CGC_BIT_PEX1            (18)
+#define CGC_BIT_GE1             (19)
+#define CGC_BIT_TDM             (20)
 #define CGC_GE0                 (1 << 0)
 #define CGC_PEX0                (1 << 2)
 #define CGC_USB0                (1 << 3)
diff --git a/arch/arm/mach-kirkwood/mv88f6281gtw_ge-setup.c b/arch/arm/mach-kirkwood/mv88f6281gtw_ge-setup.c
index 85f6169c2484..6d8364a97810 100644
--- a/arch/arm/mach-kirkwood/mv88f6281gtw_ge-setup.c
+++ b/arch/arm/mach-kirkwood/mv88f6281gtw_ge-setup.c
@@ -23,7 +23,6 @@
 #include <linux/gpio_keys.h>
 #include <linux/spi/flash.h>
 #include <linux/spi/spi.h>
-#include <linux/spi/orion_spi.h>
 #include <net/dsa.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
diff --git a/arch/arm/mach-kirkwood/pcie.c b/arch/arm/mach-kirkwood/pcie.c
index f56a0118c1bb..f26d6cff8bab 100644
--- a/arch/arm/mach-kirkwood/pcie.c
+++ b/arch/arm/mach-kirkwood/pcie.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
+#include <linux/clk.h>
 #include <video/vga.h>
 #include <asm/irq.h>
 #include <asm/mach/pci.h>
@@ -19,6 +20,23 @@
 #include <plat/addr-map.h>
 #include "common.h"
 
+static void kirkwood_enable_pcie_clk(const char *port)
+{
+        struct clk *clk;
+
+        clk = clk_get_sys("pcie", port);
+        if (IS_ERR(clk)) {
+                printk(KERN_ERR "PCIE clock %s missing\n", port);
+                return;
+        }
+        clk_prepare_enable(clk);
+        clk_put(clk);
+}
+
+/* This function is called very early in the boot when probing the
+   hardware to determine what we actually are, and what rate tclk is
+   ticking at. Hence calling kirkwood_enable_pcie_clk() is not
+   possible since the clk tree has not been created yet. */
 void kirkwood_enable_pcie(void)
 {
         u32 curr = readl(CLOCK_GATING_CTRL);
@@ -26,7 +44,7 @@ void kirkwood_enable_pcie(void)
                 writel(curr | CGC_PEX0, CLOCK_GATING_CTRL);
 }
 
-void __init kirkwood_pcie_id(u32 *dev, u32 *rev)
+void kirkwood_pcie_id(u32 *dev, u32 *rev)
 {
         kirkwood_enable_pcie();
         *dev = orion_pcie_dev_id((void __iomem *)PCIE_VIRT_BASE);
@@ -163,7 +181,6 @@ static void __init pcie1_ioresources_init(struct pcie_port *pp)
 
 static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
 {
-        extern unsigned int kirkwood_clk_ctrl;
         struct pcie_port *pp;
         int index;
 
@@ -182,11 +199,11 @@ static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys)
 
         switch (index) {
         case 0:
-                kirkwood_clk_ctrl |= CGC_PEX0;
+                kirkwood_enable_pcie_clk("0");
                 pcie0_ioresources_init(pp);
                 break;
         case 1:
-                kirkwood_clk_ctrl |= CGC_PEX1;
+                kirkwood_enable_pcie_clk("1");
                 pcie1_ioresources_init(pp);
                 break;
         default:
diff --git a/arch/arm/mach-kirkwood/rd88f6192-nas-setup.c b/arch/arm/mach-kirkwood/rd88f6192-nas-setup.c
index fd2c9c8b6831..f742a66a7045 100644
--- a/arch/arm/mach-kirkwood/rd88f6192-nas-setup.c
+++ b/arch/arm/mach-kirkwood/rd88f6192-nas-setup.c
@@ -16,7 +16,6 @@
 #include <linux/gpio.h>
 #include <linux/spi/flash.h>
 #include <linux/spi/spi.h>
-#include <linux/spi/orion_spi.h>
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
 #include <mach/kirkwood.h>
diff --git a/arch/arm/mach-kirkwood/t5325-setup.c b/arch/arm/mach-kirkwood/t5325-setup.c
index f9d2a11b7f96..bad738e44044 100644
--- a/arch/arm/mach-kirkwood/t5325-setup.c
+++ b/arch/arm/mach-kirkwood/t5325-setup.c
@@ -16,7 +16,6 @@
 #include <linux/mtd/physmap.h>
 #include <linux/spi/flash.h>
 #include <linux/spi/spi.h>
-#include <linux/spi/orion_spi.h>
 #include <linux/i2c.h>
 #include <linux/mv643xx_eth.h>
 #include <linux/ata_platform.h>
diff --git a/arch/arm/mach-kirkwood/tsx1x-common.c b/arch/arm/mach-kirkwood/tsx1x-common.c
index 24294b2bc469..8943ede29b44 100644
--- a/arch/arm/mach-kirkwood/tsx1x-common.c
+++ b/arch/arm/mach-kirkwood/tsx1x-common.c
@@ -4,7 +4,6 @@
 #include <linux/mtd/physmap.h>
 #include <linux/spi/flash.h>
 #include <linux/spi/spi.h>
-#include <linux/spi/orion_spi.h>
 #include <linux/serial_reg.h>
 #include <mach/kirkwood.h>
 #include "common.h"
diff --git a/arch/arm/mach-mv78xx0/common.c b/arch/arm/mach-mv78xx0/common.c
index a5dcf766a3f9..b4c53b846c9c 100644
--- a/arch/arm/mach-mv78xx0/common.c
+++ b/arch/arm/mach-mv78xx0/common.c
@@ -13,6 +13,7 @@
 #include <linux/platform_device.h>
 #include <linux/serial_8250.h>
 #include <linux/ata_platform.h>
+#include <linux/clk-provider.h>
 #include <linux/ethtool.h>
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
@@ -103,24 +104,24 @@ static void get_pclk_l2clk(int hclk, int core_index, int *pclk, int *l2clk)
 
 static int get_tclk(void)
 {
-        int tclk;
+        int tclk_freq;
 
         /*
          * TCLK tick rate is configured by DEV_A[2:0] strap pins.
          */
         switch ((readl(SAMPLE_AT_RESET_HIGH) >> 6) & 7) {
         case 1:
-                tclk = 166666667;
+                tclk_freq = 166666667;
                 break;
         case 3:
-                tclk = 200000000;
+                tclk_freq = 200000000;
                 break;
         default:
                 panic("unknown TCLK PLL setting: %.8x\n",
                         readl(SAMPLE_AT_RESET_HIGH));
         }
 
-        return tclk;
+        return tclk_freq;
 }
 
 
@@ -166,6 +167,19 @@ void __init mv78xx0_map_io(void)
 
 
 /*****************************************************************************
+ * CLK tree
+ ****************************************************************************/
+static struct clk *tclk;
+
+static void __init clk_init(void)
+{
+        tclk = clk_register_fixed_rate(NULL, "tclk", NULL, CLK_IS_ROOT,
+                                       get_tclk());
+
+        orion_clkdev_init(tclk);
+}
+
+/*****************************************************************************
  * EHCI
  ****************************************************************************/
 void __init mv78xx0_ehci0_init(void)
@@ -199,7 +213,7 @@ void __init mv78xx0_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
         orion_ge00_init(eth_data,
                         GE00_PHYS_BASE, IRQ_MV78XX0_GE00_SUM,
-                        IRQ_MV78XX0_GE_ERR, get_tclk());
+                        IRQ_MV78XX0_GE_ERR);
 }
 
 
@@ -210,7 +224,7 @@ void __init mv78xx0_ge01_init(struct mv643xx_eth_platform_data *eth_data)
 {
         orion_ge01_init(eth_data,
                         GE01_PHYS_BASE, IRQ_MV78XX0_GE01_SUM,
-                        NO_IRQ, get_tclk());
+                        NO_IRQ);
 }
 
 
@@ -234,7 +248,7 @@ void __init mv78xx0_ge10_init(struct mv643xx_eth_platform_data *eth_data)
 
         orion_ge10_init(eth_data,
                         GE10_PHYS_BASE, IRQ_MV78XX0_GE10_SUM,
-                        NO_IRQ, get_tclk());
+                        NO_IRQ);
 }
 
 
@@ -258,7 +272,7 @@ void __init mv78xx0_ge11_init(struct mv643xx_eth_platform_data *eth_data)
 
         orion_ge11_init(eth_data,
                         GE11_PHYS_BASE, IRQ_MV78XX0_GE11_SUM,
-                        NO_IRQ, get_tclk());
+                        NO_IRQ);
 }
 
 /*****************************************************************************
@@ -285,7 +299,7 @@ void __init mv78xx0_sata_init(struct mv_sata_platform_data *sata_data)
 void __init mv78xx0_uart0_init(void)
 {
         orion_uart0_init(UART0_VIRT_BASE, UART0_PHYS_BASE,
-                         IRQ_MV78XX0_UART_0, get_tclk());
+                         IRQ_MV78XX0_UART_0, tclk);
 }
 
 
@@ -295,7 +309,7 @@ void __init mv78xx0_uart0_init(void)
 void __init mv78xx0_uart1_init(void)
 {
         orion_uart1_init(UART1_VIRT_BASE, UART1_PHYS_BASE,
-                         IRQ_MV78XX0_UART_1, get_tclk());
+                         IRQ_MV78XX0_UART_1, tclk);
 }
 
 
@@ -305,7 +319,7 @@ void __init mv78xx0_uart1_init(void)
 void __init mv78xx0_uart2_init(void)
 {
         orion_uart2_init(UART2_VIRT_BASE, UART2_PHYS_BASE,
-                         IRQ_MV78XX0_UART_2, get_tclk());
+                         IRQ_MV78XX0_UART_2, tclk);
 }
 
 /*****************************************************************************
@@ -314,7 +328,7 @@ void __init mv78xx0_uart2_init(void)
 void __init mv78xx0_uart3_init(void)
 {
         orion_uart3_init(UART3_VIRT_BASE, UART3_PHYS_BASE,
-                         IRQ_MV78XX0_UART_3, get_tclk());
+                         IRQ_MV78XX0_UART_3, tclk);
 }
 
 /*****************************************************************************
@@ -378,25 +392,26 @@ void __init mv78xx0_init(void)
         int hclk;
         int pclk;
         int l2clk;
-        int tclk;
 
         core_index = mv78xx0_core_index();
         hclk = get_hclk();
         get_pclk_l2clk(hclk, core_index, &pclk, &l2clk);
-        tclk = get_tclk();
 
         printk(KERN_INFO "%s ", mv78xx0_id());
         printk("core #%d, ", core_index);
         printk("PCLK = %dMHz, ", (pclk + 499999) / 1000000);
         printk("L2 = %dMHz, ", (l2clk + 499999) / 1000000);
         printk("HCLK = %dMHz, ", (hclk + 499999) / 1000000);
-        printk("TCLK = %dMHz\n", (tclk + 499999) / 1000000);
+        printk("TCLK = %dMHz\n", (get_tclk() + 499999) / 1000000);
 
         mv78xx0_setup_cpu_mbus();
 
 #ifdef CONFIG_CACHE_FEROCEON_L2
         feroceon_l2_init(is_l2_writethrough());
 #endif
+
+        /* Setup root of clk tree */
+        clk_init();
 }
 
 void mv78xx0_restart(char mode, const char *cmd)
diff --git a/arch/arm/mach-orion5x/common.c b/arch/arm/mach-orion5x/common.c
index 24481666d2cd..fd36e020d09d 100644
--- a/arch/arm/mach-orion5x/common.c
+++ b/arch/arm/mach-orion5x/common.c
@@ -18,6 +18,7 @@
 #include <linux/mv643xx_i2c.h>
 #include <linux/ata_platform.h>
 #include <linux/delay.h>
+#include <linux/clk-provider.h>
 #include <net/dsa.h>
 #include <asm/page.h>
 #include <asm/setup.h>
@@ -70,6 +71,19 @@ void __init orion5x_map_io(void)
 
 
 /*****************************************************************************
+ * CLK tree
+ ****************************************************************************/
+static struct clk *tclk;
+
+static void __init clk_init(void)
+{
+        tclk = clk_register_fixed_rate(NULL, "tclk", NULL, CLK_IS_ROOT,
+                                       orion5x_tclk);
+
+        orion_clkdev_init(tclk);
+}
+
+/*****************************************************************************
  * EHCI0
  ****************************************************************************/
 void __init orion5x_ehci0_init(void)
@@ -95,7 +109,7 @@ void __init orion5x_eth_init(struct mv643xx_eth_platform_data *eth_data)
 {
         orion_ge00_init(eth_data,
                         ORION5X_ETH_PHYS_BASE, IRQ_ORION5X_ETH_SUM,
-                        IRQ_ORION5X_ETH_ERR, orion5x_tclk);
+                        IRQ_ORION5X_ETH_ERR);
 }
 
 
@@ -132,7 +146,7 @@ void __init orion5x_sata_init(struct mv_sata_platform_data *sata_data)
  ****************************************************************************/
 void __init orion5x_spi_init()
 {
-        orion_spi_init(SPI_PHYS_BASE, orion5x_tclk);
+        orion_spi_init(SPI_PHYS_BASE);
 }
 
 
@@ -142,7 +156,7 @@ void __init orion5x_spi_init()
 void __init orion5x_uart0_init(void)
 {
         orion_uart0_init(UART0_VIRT_BASE, UART0_PHYS_BASE,
-                         IRQ_ORION5X_UART0, orion5x_tclk);
+                         IRQ_ORION5X_UART0, tclk);
 }
 
 /*****************************************************************************
@@ -151,7 +165,7 @@ void __init orion5x_uart0_init(void)
 void __init orion5x_uart1_init(void)
 {
         orion_uart1_init(UART1_VIRT_BASE, UART1_PHYS_BASE,
-                         IRQ_ORION5X_UART1, orion5x_tclk);
+                         IRQ_ORION5X_UART1, tclk);
 }
 
 /*****************************************************************************
@@ -179,7 +193,7 @@ static void __init orion5x_crypto_init(void)
  ****************************************************************************/
 void __init orion5x_wdt_init(void)
 {
-        orion_wdt_init(orion5x_tclk);
+        orion_wdt_init();
 }
 
 
@@ -276,6 +290,9 @@ void __init orion5x_init(void)
          */
         orion5x_setup_cpu_mbus_bridge();
 
+        /* Setup root of clk tree */
+        clk_init();
+
         /*
          * Don't issue "Wait for Interrupt" instruction if we are
          * running on D0 5281 silicon.
diff --git a/arch/arm/mach-orion5x/rd88f6183ap-ge-setup.c b/arch/arm/mach-orion5x/rd88f6183ap-ge-setup.c
index 2c5fab00d205..7b97a9a211ed 100644
--- a/arch/arm/mach-orion5x/rd88f6183ap-ge-setup.c
+++ b/arch/arm/mach-orion5x/rd88f6183ap-ge-setup.c
@@ -16,7 +16,6 @@
 #include <linux/mtd/physmap.h>
 #include <linux/mv643xx_eth.h>
 #include <linux/spi/spi.h>
-#include <linux/spi/orion_spi.h>
 #include <linux/spi/flash.h>
 #include <linux/ethtool.h>
 #include <net/dsa.h>
diff --git a/arch/arm/plat-orion/common.c b/arch/arm/plat-orion/common.c
index 74daf5ed1432..61fd837624a8 100644
--- a/arch/arm/plat-orion/common.c
+++ b/arch/arm/plat-orion/common.c
@@ -14,15 +14,41 @@
 #include <linux/dma-mapping.h>
 #include <linux/serial_8250.h>
 #include <linux/ata_platform.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
 #include <linux/mv643xx_eth.h>
 #include <linux/mv643xx_i2c.h>
 #include <net/dsa.h>
-#include <linux/spi/orion_spi.h>
-#include <plat/orion_wdt.h>
 #include <plat/mv_xor.h>
 #include <plat/ehci-orion.h>
 #include <mach/bridge-regs.h>
 
+/* Create a clkdev entry for a given device/clk */
+void __init orion_clkdev_add(const char *con_id, const char *dev_id,
+                             struct clk *clk)
+{
+        struct clk_lookup *cl;
+
+        cl = clkdev_alloc(clk, con_id, dev_id);
+        if (cl)
+                clkdev_add(cl);
+}
+
+/* Create clkdev entries for all orion platforms except kirkwood.
+   Kirkwood has gated clocks for some of its peripherals, so creates
+   its own clkdev entries. For all the other orion devices, create
+   clkdev entries to the tclk. */
+void __init orion_clkdev_init(struct clk *tclk)
+{
+        orion_clkdev_add(NULL, "orion_spi.0", tclk);
+        orion_clkdev_add(NULL, "orion_spi.1", tclk);
+        orion_clkdev_add(NULL, MV643XX_ETH_NAME ".0", tclk);
+        orion_clkdev_add(NULL, MV643XX_ETH_NAME ".1", tclk);
+        orion_clkdev_add(NULL, MV643XX_ETH_NAME ".2", tclk);
+        orion_clkdev_add(NULL, MV643XX_ETH_NAME ".3", tclk);
+        orion_clkdev_add(NULL, "orion_wdt", tclk);
+}
+
 /* Fill in the resources structure and link it into the platform
    device structure. There is always a memory region, and nearly
    always an interrupt.*/
@@ -49,6 +75,12 @@ static void fill_resources(struct platform_device *device,
 /*****************************************************************************
  * UART
  ****************************************************************************/
+static unsigned long __init uart_get_clk_rate(struct clk *clk)
+{
+        clk_prepare_enable(clk);
+        return clk_get_rate(clk);
+}
+
 static void __init uart_complete(
         struct platform_device *orion_uart,
         struct plat_serial8250_port *data,
@@ -56,12 +88,12 @@ static void __init uart_complete(
         unsigned int membase,
         resource_size_t mapbase,
         unsigned int irq,
-        unsigned int uartclk)
+        struct clk *clk)
 {
         data->mapbase = mapbase;
         data->membase = (void __iomem *)membase;
         data->irq = irq;
-        data->uartclk = uartclk;
+        data->uartclk = uart_get_clk_rate(clk);
         orion_uart->dev.platform_data = data;
 
         fill_resources(orion_uart, resources, mapbase, 0xff, irq);
@@ -90,10 +122,10 @@ static struct platform_device orion_uart0 = {
 void __init orion_uart0_init(unsigned int membase,
                              resource_size_t mapbase,
                              unsigned int irq,
-                             unsigned int uartclk)
+                             struct clk *clk)
 {
         uart_complete(&orion_uart0, orion_uart0_data, orion_uart0_resources,
-                      membase, mapbase, irq, uartclk);
+                      membase, mapbase, irq, clk);
 }
 
 /*****************************************************************************
@@ -118,10 +150,10 @@ static struct platform_device orion_uart1 = {
 void __init orion_uart1_init(unsigned int membase,
                              resource_size_t mapbase,
                              unsigned int irq,
-                             unsigned int uartclk)
+                             struct clk *clk)
 {
         uart_complete(&orion_uart1, orion_uart1_data, orion_uart1_resources,
-                      membase, mapbase, irq, uartclk);
+                      membase, mapbase, irq, clk);
 }
 
 /*****************************************************************************
@@ -146,10 +178,10 @@ static struct platform_device orion_uart2 = {
 void __init orion_uart2_init(unsigned int membase,
                              resource_size_t mapbase,
                              unsigned int irq,
-                             unsigned int uartclk)
+                             struct clk *clk)
 {
         uart_complete(&orion_uart2, orion_uart2_data, orion_uart2_resources,
-                      membase, mapbase, irq, uartclk);
+                      membase, mapbase, irq, clk);
 }
 
 /*****************************************************************************
@@ -174,10 +206,10 @@ static struct platform_device orion_uart3 = {
 void __init orion_uart3_init(unsigned int membase,
                              resource_size_t mapbase,
                              unsigned int irq,
-                             unsigned int uartclk)
+                             struct clk *clk)
 {
         uart_complete(&orion_uart3, orion_uart3_data, orion_uart3_resources,
-                      membase, mapbase, irq, uartclk);
+                      membase, mapbase, irq, clk);
 }
 
 /*****************************************************************************
@@ -203,13 +235,11 @@ void __init orion_rtc_init(unsigned long mapbase,
  ****************************************************************************/
 static __init void ge_complete(
         struct mv643xx_eth_shared_platform_data *orion_ge_shared_data,
-        int tclk,
         struct resource *orion_ge_resource, unsigned long irq,
         struct platform_device *orion_ge_shared,
         struct mv643xx_eth_platform_data *eth_data,
         struct platform_device *orion_ge)
 {
-        orion_ge_shared_data->t_clk = tclk;
         orion_ge_resource->start = irq;
         orion_ge_resource->end = irq;
         eth_data->shared = orion_ge_shared;
@@ -260,12 +290,11 @@ static struct platform_device orion_ge00 = {
 void __init orion_ge00_init(struct mv643xx_eth_platform_data *eth_data,
                             unsigned long mapbase,
                             unsigned long irq,
-                            unsigned long irq_err,
-                            int tclk)
+                            unsigned long irq_err)
 {
         fill_resources(&orion_ge00_shared, orion_ge00_shared_resources,
                        mapbase + 0x2000, SZ_16K - 1, irq_err);
-        ge_complete(&orion_ge00_shared_data, tclk,
+        ge_complete(&orion_ge00_shared_data,
                     orion_ge00_resources, irq, &orion_ge00_shared,
                     eth_data, &orion_ge00);
 }
@@ -313,12 +342,11 @@ static struct platform_device orion_ge01 = {
 void __init orion_ge01_init(struct mv643xx_eth_platform_data *eth_data,
                             unsigned long mapbase,
                             unsigned long irq,
-                            unsigned long irq_err,
-                            int tclk)
+                            unsigned long irq_err)
 {
         fill_resources(&orion_ge01_shared, orion_ge01_shared_resources,
                        mapbase + 0x2000, SZ_16K - 1, irq_err);
-        ge_complete(&orion_ge01_shared_data, tclk,
+        ge_complete(&orion_ge01_shared_data,
                     orion_ge01_resources, irq, &orion_ge01_shared,
                     eth_data, &orion_ge01);
 }
@@ -366,12 +394,11 @@ static struct platform_device orion_ge10 = {
 void __init orion_ge10_init(struct mv643xx_eth_platform_data *eth_data,
                             unsigned long mapbase,
                             unsigned long irq,
-                            unsigned long irq_err,
-                            int tclk)
+                            unsigned long irq_err)
 {
         fill_resources(&orion_ge10_shared, orion_ge10_shared_resources,
                        mapbase + 0x2000, SZ_16K - 1, irq_err);
-        ge_complete(&orion_ge10_shared_data, tclk,
+        ge_complete(&orion_ge10_shared_data,
                     orion_ge10_resources, irq, &orion_ge10_shared,
                     eth_data, &orion_ge10);
 }
@@ -419,12 +446,11 @@ static struct platform_device orion_ge11 = {
 void __init orion_ge11_init(struct mv643xx_eth_platform_data *eth_data,
                             unsigned long mapbase,
                             unsigned long irq,
-                            unsigned long irq_err,
-                            int tclk)
+                            unsigned long irq_err)
 {
         fill_resources(&orion_ge11_shared, orion_ge11_shared_resources,
                        mapbase + 0x2000, SZ_16K - 1, irq_err);
-        ge_complete(&orion_ge11_shared_data, tclk,
+        ge_complete(&orion_ge11_shared_data,
                     orion_ge11_resources, irq, &orion_ge11_shared,
                     eth_data, &orion_ge11);
 }
@@ -521,44 +547,32 @@ void __init orion_i2c_1_init(unsigned long mapbase,
 /*****************************************************************************
  * SPI
  ****************************************************************************/
-static struct orion_spi_info orion_spi_plat_data;
 static struct resource orion_spi_resources;
 
 static struct platform_device orion_spi = {
         .name           = "orion_spi",
         .id             = 0,
-        .dev            = {
-                .platform_data  = &orion_spi_plat_data,
-        },
 };
 
-static struct orion_spi_info orion_spi_1_plat_data;
 static struct resource orion_spi_1_resources;
 
 static struct platform_device orion_spi_1 = {
         .name           = "orion_spi",
         .id             = 1,
-        .dev            = {
-                .platform_data  = &orion_spi_1_plat_data,
-        },
 };
 
 /* Note: The SPI silicon core does have interrupts. However the
  * current Linux software driver does not use interrupts. */
 
-void __init orion_spi_init(unsigned long mapbase,
-                           unsigned long tclk)
+void __init orion_spi_init(unsigned long mapbase)
 {
-        orion_spi_plat_data.tclk = tclk;
         fill_resources(&orion_spi, &orion_spi_resources,
                        mapbase, SZ_512 - 1, NO_IRQ);
         platform_device_register(&orion_spi);
 }
 
-void __init orion_spi_1_init(unsigned long mapbase,
-                             unsigned long tclk)
+void __init orion_spi_1_init(unsigned long mapbase)
 {
-        orion_spi_1_plat_data.tclk = tclk;
         fill_resources(&orion_spi_1, &orion_spi_1_resources,
                        mapbase, SZ_512 - 1, NO_IRQ);
         platform_device_register(&orion_spi_1);
@@ -567,24 +581,18 @@ void __init orion_spi_1_init(unsigned long mapbase,
 /*****************************************************************************
  * Watchdog
  ****************************************************************************/
-static struct orion_wdt_platform_data orion_wdt_data;
-
 static struct resource orion_wdt_resource =
                 DEFINE_RES_MEM(TIMER_VIRT_BASE, 0x28);
 
 static struct platform_device orion_wdt_device = {
         .name           = "orion_wdt",
         .id             = -1,
-        .dev            = {
-                .platform_data  = &orion_wdt_data,
-        },
-        .resource       = &orion_wdt_resource,
         .num_resources  = 1,
+        .resource       = &orion_wdt_resource,
 };
 
-void __init orion_wdt_init(unsigned long tclk)
+void __init orion_wdt_init(void)
 {
-        orion_wdt_data.tclk = tclk;
         platform_device_register(&orion_wdt_device);
 }
 
diff --git a/arch/arm/plat-orion/include/plat/common.h b/arch/arm/plat-orion/include/plat/common.h
index a7fa005a5a0e..e00fdb213609 100644
--- a/arch/arm/plat-orion/include/plat/common.h
+++ b/arch/arm/plat-orion/include/plat/common.h
@@ -16,22 +16,22 @@ struct dsa_platform_data;
 void __init orion_uart0_init(unsigned int membase,
                              resource_size_t mapbase,
                              unsigned int irq,
-                             unsigned int uartclk);
+                             struct clk *clk);
 
 void __init orion_uart1_init(unsigned int membase,
                              resource_size_t mapbase,
                              unsigned int irq,
-                             unsigned int uartclk);
+                             struct clk *clk);
 
 void __init orion_uart2_init(unsigned int membase,
                              resource_size_t mapbase,
                              unsigned int irq,
-                             unsigned int uartclk);
+                             struct clk *clk);
 
 void __init orion_uart3_init(unsigned int membase,
                              resource_size_t mapbase,
                              unsigned int irq,
-                             unsigned int uartclk);
+                             struct clk *clk);
 
 void __init orion_rtc_init(unsigned long mapbase,
                            unsigned long irq);
@@ -39,29 +39,26 @@ void __init orion_rtc_init(unsigned long mapbase,
 void __init orion_ge00_init(struct mv643xx_eth_platform_data *eth_data,
                             unsigned long mapbase,
                             unsigned long irq,
-                            unsigned long irq_err,
-                            int tclk);
+                            unsigned long irq_err);
 
 void __init orion_ge01_init(struct mv643xx_eth_platform_data *eth_data,
                             unsigned long mapbase,
                             unsigned long irq,
-                            unsigned long irq_err,
-                            int tclk);
+                            unsigned long irq_err);
 
 void __init orion_ge10_init(struct mv643xx_eth_platform_data *eth_data,
                             unsigned long mapbase,
                             unsigned long irq,
-                            unsigned long irq_err,
-                            int tclk);
+                            unsigned long irq_err);
 
 void __init orion_ge11_init(struct mv643xx_eth_platform_data *eth_data,
                             unsigned long mapbase,
                             unsigned long irq,
-                            unsigned long irq_err,
-                            int tclk);
+                            unsigned long irq_err);
 
 void __init orion_ge00_switch_init(struct dsa_platform_data *d,
                                    int irq);
+
 void __init orion_i2c_init(unsigned long mapbase,
                            unsigned long irq,
                            unsigned long freq_m);
@@ -70,13 +67,11 @@ void __init orion_i2c_1_init(unsigned long mapbase,
                              unsigned long irq,
                              unsigned long freq_m);
 
-void __init orion_spi_init(unsigned long mapbase,
-                           unsigned long tclk);
+void __init orion_spi_init(unsigned long mapbase);
 
-void __init orion_spi_1_init(unsigned long mapbase,
-                             unsigned long tclk);
+void __init orion_spi_1_init(unsigned long mapbase);
 
-void __init orion_wdt_init(unsigned long tclk);
+void __init orion_wdt_init(void);
 
 void __init orion_xor0_init(unsigned long mapbase_low,
                             unsigned long mapbase_high,
@@ -106,4 +101,9 @@ void __init orion_crypto_init(unsigned long mapbase,
                               unsigned long srambase,
                               unsigned long sram_size,
                               unsigned long irq);
+
+void __init orion_clkdev_add(const char *con_id, const char *dev_id,
+                             struct clk *clk);
+
+void __init orion_clkdev_init(struct clk *tclk);
 #endif
diff --git a/arch/arm/plat-orion/include/plat/orion_wdt.h b/arch/arm/plat-orion/include/plat/orion_wdt.h
deleted file mode 100644
index 665c362a2fba..000000000000
--- a/arch/arm/plat-orion/include/plat/orion_wdt.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
- * arch/arm/plat-orion/include/plat/orion_wdt.h
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- */
-
-#ifndef __PLAT_ORION_WDT_H
-#define __PLAT_ORION_WDT_H
-
-struct orion_wdt_platform_data {
-        u32     tclk;           /* no <linux/clk.h> support yet */
-};
-
-
-#endif
-
diff --git a/arch/arm/plat-orion/pcie.c b/arch/arm/plat-orion/pcie.c
index 86dbb5bdb172..f20a321088a2 100644
--- a/arch/arm/plat-orion/pcie.c
+++ b/arch/arm/plat-orion/pcie.c
@@ -52,12 +52,12 @@
 #define  PCIE_DEBUG_SOFT_RESET          (1<<20)
 
 
-u32 __init orion_pcie_dev_id(void __iomem *base)
+u32 orion_pcie_dev_id(void __iomem *base)
 {
         return readl(base + PCIE_DEV_ID_OFF) >> 16;
 }
 
-u32 __init orion_pcie_rev(void __iomem *base)
+u32 orion_pcie_rev(void __iomem *base)
 {
         return readl(base + PCIE_DEV_REV_OFF) & 0xff;
 }
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 7336d4a7ab31..24712adf69df 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -553,6 +553,7 @@ struct mv_host_priv {
 
 #if defined(CONFIG_HAVE_CLK)
         struct clk              *clk;
+        struct clk              **port_clks;
 #endif
         /*
          * These consistent DMA memory pools give us guaranteed
@@ -4027,6 +4028,9 @@ static int mv_platform_probe(struct platform_device *pdev)
         struct resource *res;
         int n_ports = 0;
         int rc;
+#if defined(CONFIG_HAVE_CLK)
+        int port;
+#endif
 
         ata_print_version_once(&pdev->dev, DRV_VERSION);
 
@@ -4054,6 +4058,13 @@ static int mv_platform_probe(struct platform_device *pdev)
 
         if (!host || !hpriv)
                 return -ENOMEM;
+#if defined(CONFIG_HAVE_CLK)
+        hpriv->port_clks = devm_kzalloc(&pdev->dev,
+                                        sizeof(struct clk *) * n_ports,
+                                        GFP_KERNEL);
+        if (!hpriv->port_clks)
+                return -ENOMEM;
+#endif
         host->private_data = hpriv;
         hpriv->n_ports = n_ports;
         hpriv->board_idx = chip_soc;
@@ -4066,9 +4077,17 @@ static int mv_platform_probe(struct platform_device *pdev)
 #if defined(CONFIG_HAVE_CLK)
         hpriv->clk = clk_get(&pdev->dev, NULL);
         if (IS_ERR(hpriv->clk))
-                dev_notice(&pdev->dev, "cannot get clkdev\n");
+                dev_notice(&pdev->dev, "cannot get optional clkdev\n");
         else
-                clk_enable(hpriv->clk);
+                clk_prepare_enable(hpriv->clk);
+
+        for (port = 0; port < n_ports; port++) {
+                char port_number[16];
+                sprintf(port_number, "%d", port);
+                hpriv->port_clks[port] = clk_get(&pdev->dev, port_number);
+                if (!IS_ERR(hpriv->port_clks[port]))
+                        clk_prepare_enable(hpriv->port_clks[port]);
+        }
 #endif
 
         /*
@@ -4098,9 +4117,15 @@ static int mv_platform_probe(struct platform_device *pdev)
 err:
 #if defined(CONFIG_HAVE_CLK)
         if (!IS_ERR(hpriv->clk)) {
-                clk_disable(hpriv->clk);
+                clk_disable_unprepare(hpriv->clk);
                 clk_put(hpriv->clk);
         }
+        for (port = 0; port < n_ports; port++) {
+                if (!IS_ERR(hpriv->port_clks[port])) {
+                        clk_disable_unprepare(hpriv->port_clks[port]);
+                        clk_put(hpriv->port_clks[port]);
+                }
+        }
 #endif
 
         return rc;
@@ -4119,14 +4144,21 @@ static int __devexit mv_platform_remove(struct platform_device *pdev)
         struct ata_host *host = platform_get_drvdata(pdev);
 #if defined(CONFIG_HAVE_CLK)
         struct mv_host_priv *hpriv = host->private_data;
+        int port;
 #endif
         ata_host_detach(host);
 
 #if defined(CONFIG_HAVE_CLK)
         if (!IS_ERR(hpriv->clk)) {
-                clk_disable(hpriv->clk);
+                clk_disable_unprepare(hpriv->clk);
                 clk_put(hpriv->clk);
         }
+        for (port = 0; port < host->n_ports; port++) {
+                if (!IS_ERR(hpriv->port_clks[port])) {
+                        clk_disable_unprepare(hpriv->port_clks[port]);
+                        clk_put(hpriv->port_clks[port]);
+                }
+        }
 #endif
         return 0;
 }
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index e5d5dc13bcfd..687b00d67c8a 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -903,7 +903,7 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
         if (rate == clk->rate)
                 goto out;
 
-        if ((clk->flags & CLK_SET_RATE_GATE) && __clk_is_enabled(clk)) {
+        if ((clk->flags & CLK_SET_RATE_GATE) && clk->prepare_count) {
                 ret = -EBUSY;
                 goto out;
         }
@@ -1420,6 +1420,15 @@ fail_out:
 }
 EXPORT_SYMBOL_GPL(clk_register);
 
+/**
+ * clk_unregister - unregister a currently registered clock
+ * @clk: clock to unregister
+ *
+ * Currently unimplemented.
+ */
+void clk_unregister(struct clk *clk) {}
+EXPORT_SYMBOL_GPL(clk_unregister);
+
 /***        clk rate change notifiers        ***/
 
 /**
diff --git a/drivers/crypto/mv_cesa.c b/drivers/crypto/mv_cesa.c
index e6ecc5f23943..1cc6b3f3e262 100644
--- a/drivers/crypto/mv_cesa.c
+++ b/drivers/crypto/mv_cesa.c
@@ -16,6 +16,7 @@
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#include <linux/clk.h>
 #include <crypto/internal/hash.h>
 #include <crypto/sha.h>
 
@@ -79,6 +80,7 @@ struct crypto_priv {
         void __iomem *reg;
         void __iomem *sram;
         int irq;
+        struct clk *clk;
         struct task_struct *queue_th;
 
         /* the lock protects queue and eng_st */
@@ -1053,6 +1055,12 @@ static int mv_probe(struct platform_device *pdev)
         if (ret)
                 goto err_thread;
 
+        /* Not all platforms can gate the clock, so it is not
+           an error if the clock does not exists. */
+        cp->clk = clk_get(&pdev->dev, NULL);
+        if (!IS_ERR(cp->clk))
+                clk_prepare_enable(cp->clk);
+
         writel(SEC_INT_ACCEL0_DONE, cpg->reg + SEC_ACCEL_INT_MASK);
         writel(SEC_CFG_STOP_DIG_ERR, cpg->reg + SEC_ACCEL_CFG);
         writel(SRAM_CONFIG, cpg->reg + SEC_ACCEL_DESC_P0);
@@ -1118,6 +1126,12 @@ static int mv_remove(struct platform_device *pdev)
         memset(cp->sram, 0, cp->sram_size);
         iounmap(cp->sram);
         iounmap(cp->reg);
+
+        if (!IS_ERR(cp->clk)) {
+                clk_disable_unprepare(cp->clk);
+                clk_put(cp->clk);
+        }
+
         kfree(cp);
         cpg = NULL;
         return 0;
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index fa5d55fea46c..0b12e68bf79c 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -25,6 +25,7 @@
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/memory.h>
+#include <linux/clk.h>
 #include <plat/mv_xor.h>
 
 #include "dmaengine.h"
@@ -1307,11 +1308,25 @@ static int mv_xor_shared_probe(struct platform_device *pdev)
         if (dram)
                 mv_xor_conf_mbus_windows(msp, dram);
 
+        /* Not all platforms can gate the clock, so it is not
+         * an error if the clock does not exists.
+         */
+        msp->clk = clk_get(&pdev->dev, NULL);
+        if (!IS_ERR(msp->clk))
+                clk_prepare_enable(msp->clk);
+
         return 0;
 }
 
 static int mv_xor_shared_remove(struct platform_device *pdev)
 {
+        struct mv_xor_shared_private *msp = platform_get_drvdata(pdev);
+
+        if (!IS_ERR(msp->clk)) {
+                clk_disable_unprepare(msp->clk);
+                clk_put(msp->clk);
+        }
+
         return 0;
 }
 
diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h
index 654876b7ba1d..a5b422f5a8ab 100644
--- a/drivers/dma/mv_xor.h
+++ b/drivers/dma/mv_xor.h
@@ -55,6 +55,7 @@
 struct mv_xor_shared_private {
         void __iomem    *xor_base;
         void __iomem    *xor_high_base;
+        struct clk      *clk;
 };
 
 
diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
index eeb8cd125b0c..3b9136c1a475 100644
--- a/drivers/mmc/host/mvsdio.c
+++ b/drivers/mmc/host/mvsdio.c
@@ -19,6 +19,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/scatterlist.h>
 #include <linux/irq.h>
+#include <linux/clk.h>
 #include <linux/gpio.h>
 #include <linux/mmc/host.h>
 
@@ -51,6 +52,7 @@ struct mvsd_host {
         struct device *dev;
         struct resource *res;
         int irq;
+        struct clk *clk;
         int gpio_card_detect;
         int gpio_write_protect;
 };
@@ -770,6 +772,13 @@ static int __init mvsd_probe(struct platform_device *pdev)
         } else
                 host->irq = irq;
 
+        /* Not all platforms can gate the clock, so it is not
+           an error if the clock does not exists. */
+        host->clk = clk_get(&pdev->dev, NULL);
+        if (!IS_ERR(host->clk)) {
+                clk_prepare_enable(host->clk);
+        }
+
         if (mvsd_data->gpio_card_detect) {
                 ret = gpio_request(mvsd_data->gpio_card_detect,
                                    DRIVER_NAME " cd");
@@ -854,6 +863,11 @@ static int __exit mvsd_remove(struct platform_device *pdev)
                 mvsd_power_down(host);
                 iounmap(host->base);
                 release_resource(host->res);
+
+                if (!IS_ERR(host->clk)) {
+                        clk_disable_unprepare(host->clk);
+                        clk_put(host->clk);
+                }
                 mmc_free_host(mmc);
         }
         platform_set_drvdata(pdev, NULL);
diff --git a/drivers/mtd/nand/orion_nand.c b/drivers/mtd/nand/orion_nand.c
index 1d3bfb26080c..fdc4786ea3e5 100644
--- a/drivers/mtd/nand/orion_nand.c
+++ b/drivers/mtd/nand/orion_nand.c
@@ -16,6 +16,8 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/nand.h>
 #include <linux/mtd/partitions.h>
+#include <linux/clk.h>
+#include <linux/err.h>
 #include <asm/io.h>
 #include <asm/sizes.h>
 #include <mach/hardware.h>
@@ -77,6 +79,7 @@ static int __init orion_nand_probe(struct platform_device *pdev)
         struct nand_chip *nc;
         struct orion_nand_data *board;
         struct resource *res;
+        struct clk *clk;
         void __iomem *io_base;
         int ret = 0;
 
@@ -123,6 +126,14 @@ static int __init orion_nand_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, mtd);
 
+        /* Not all platforms can gate the clock, so it is not
+           an error if the clock does not exists. */
+        clk = clk_get(&pdev->dev, NULL);
+        if (!IS_ERR(clk)) {
+                clk_prepare_enable(clk);
+                clk_put(clk);
+        }
+
         if (nand_scan(mtd, 1)) {
                 ret = -ENXIO;
                 goto no_dev;
@@ -151,6 +162,7 @@ static int __devexit orion_nand_remove(struct platform_device *pdev)
 {
         struct mtd_info *mtd = platform_get_drvdata(pdev);
         struct nand_chip *nc = mtd->priv;
+        struct clk *clk;
 
         nand_release(mtd);
 
@@ -158,6 +170,12 @@ static int __devexit orion_nand_remove(struct platform_device *pdev)
 
         kfree(nc);
 
+        clk = clk_get(&pdev->dev, NULL);
+        if (!IS_ERR(clk)) {
+                clk_disable_unprepare(clk);
+                clk_put(clk);
+        }
+
         return 0;
 }
 
diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index 5e1ca0f05090..99cd233266ac 100644
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -57,6 +57,7 @@
 #include <linux/types.h>
 #include <linux/inet_lro.h>
 #include <linux/slab.h>
+#include <linux/clk.h>
 
 static char mv643xx_eth_driver_name[] = "mv643xx_eth";
 static char mv643xx_eth_driver_version[] = "1.4";
@@ -289,10 +290,10 @@ struct mv643xx_eth_shared_private {
         /*
          * Hardware-specific parameters.
          */
-        unsigned int t_clk;
         int extended_rx_coal_limit;
         int tx_bw_control;
         int tx_csum_limit;
+
 };
 
 #define TX_BW_CONTROL_ABSENT            0
@@ -431,6 +432,12 @@ struct mv643xx_eth_private {
         int tx_desc_sram_size;
         int txq_count;
         struct tx_queue txq[8];
+
+        /*
+         * Hardware-specific parameters.
+         */
+        struct clk *clk;
+        unsigned int t_clk;
 };
 
 
@@ -1010,7 +1017,7 @@ static void tx_set_rate(struct mv643xx_eth_private *mp, int rate, int burst)
         int mtu;
         int bucket_size;
 
-        token_rate = ((rate / 1000) * 64) / (mp->shared->t_clk / 1000);
+        token_rate = ((rate / 1000) * 64) / (mp->t_clk / 1000);
         if (token_rate > 1023)
                 token_rate = 1023;
 
@@ -1042,7 +1049,7 @@ static void txq_set_rate(struct tx_queue *txq, int rate, int burst)
         int token_rate;
         int bucket_size;
 
-        token_rate = ((rate / 1000) * 64) / (mp->shared->t_clk / 1000);
+        token_rate = ((rate / 1000) * 64) / (mp->t_clk / 1000);
         if (token_rate > 1023)
                 token_rate = 1023;
 
@@ -1309,7 +1316,7 @@ static unsigned int get_rx_coal(struct mv643xx_eth_private *mp)
                 temp = (val & 0x003fff00) >> 8;
 
         temp *= 64000000;
-        do_div(temp, mp->shared->t_clk);
+        do_div(temp, mp->t_clk);
 
         return (unsigned int)temp;
 }
@@ -1319,7 +1326,7 @@ static void set_rx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
         u64 temp;
         u32 val;
 
-        temp = (u64)usec * mp->shared->t_clk;
+        temp = (u64)usec * mp->t_clk;
         temp += 31999999;
         do_div(temp, 64000000);
 
@@ -1345,7 +1352,7 @@ static unsigned int get_tx_coal(struct mv643xx_eth_private *mp)
 
         temp = (rdlp(mp, TX_FIFO_URGENT_THRESHOLD) & 0x3fff0) >> 4;
         temp *= 64000000;
-        do_div(temp, mp->shared->t_clk);
+        do_div(temp, mp->t_clk);
 
         return (unsigned int)temp;
 }
@@ -1354,7 +1361,7 @@ static void set_tx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
 {
         u64 temp;
 
-        temp = (u64)usec * mp->shared->t_clk;
+        temp = (u64)usec * mp->t_clk;
         temp += 31999999;
         do_div(temp, 64000000);
 
@@ -2662,10 +2669,6 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
         if (dram)
                 mv643xx_eth_conf_mbus_windows(msp, dram);
 
-        /*
-         * Detect hardware parameters.
-         */
-        msp->t_clk = (pd != NULL && pd->t_clk != 0) ? pd->t_clk : 133000000;
         msp->tx_csum_limit = (pd != NULL && pd->tx_csum_limit) ?
                                         pd->tx_csum_limit : 9 * 1024;
         infer_hw_params(msp);
@@ -2890,6 +2893,18 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
 
         mp->dev = dev;
 
+        /*
+         * Get the clk rate, if there is one, otherwise use the default.
+         */
+        mp->clk = clk_get(&pdev->dev, (pdev->id ? "1" : "0"));
+        if (!IS_ERR(mp->clk)) {
+                clk_prepare_enable(mp->clk);
+                mp->t_clk = clk_get_rate(mp->clk);
+        } else {
+                mp->t_clk = 133000000;
+                printk(KERN_WARNING "Unable to get clock");
+        }
+
         set_params(mp, pd);
         netif_set_real_num_tx_queues(dev, mp->txq_count);
         netif_set_real_num_rx_queues(dev, mp->rxq_count);
@@ -2978,6 +2993,11 @@ static int mv643xx_eth_remove(struct platform_device *pdev)
         if (mp->phy != NULL)
                 phy_detach(mp->phy);
         cancel_work_sync(&mp->tx_timeout_task);
+
+        if (!IS_ERR(mp->clk)) {
+                clk_disable_unprepare(mp->clk);
+                clk_put(mp->clk);
+        }
         free_netdev(mp->dev);
 
         platform_set_drvdata(pdev, NULL);
diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c
index e496f799b7a9..dfd04e91fa6d 100644
--- a/drivers/spi/spi-orion.c
+++ b/drivers/spi/spi-orion.c
@@ -16,8 +16,8 @@
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/spi/spi.h>
-#include <linux/spi/orion_spi.h>
 #include <linux/module.h>
+#include <linux/clk.h>
 #include <asm/unaligned.h>
 
 #define DRIVER_NAME                     "orion_spi"
@@ -46,6 +46,7 @@ struct orion_spi {
         unsigned int            max_speed;
         unsigned int            min_speed;
         struct orion_spi_info   *spi_info;
+        struct clk              *clk;
 };
 
 static struct workqueue_struct *orion_spi_wq;
@@ -104,7 +105,7 @@ static int orion_spi_baudrate_set(struct spi_device *spi, unsigned int speed)
 
         orion_spi = spi_master_get_devdata(spi->master);
 
-        tclk_hz = orion_spi->spi_info->tclk;
+        tclk_hz = clk_get_rate(orion_spi->clk);
 
         /*
          * the supported rates are: 4,6,8...30
@@ -450,6 +451,7 @@ static int __init orion_spi_probe(struct platform_device *pdev)
         struct orion_spi *spi;
         struct resource *r;
         struct orion_spi_info *spi_info;
+        unsigned long tclk_hz;
         int status = 0;
 
         spi_info = pdev->dev.platform_data;
@@ -476,19 +478,28 @@ static int __init orion_spi_probe(struct platform_device *pdev)
         spi->master = master;
         spi->spi_info = spi_info;
 
-        spi->max_speed = DIV_ROUND_UP(spi_info->tclk, 4);
-        spi->min_speed = DIV_ROUND_UP(spi_info->tclk, 30);
+        spi->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(spi->clk)) {
+                status = PTR_ERR(spi->clk);
+                goto out;
+        }
+
+        clk_prepare(spi->clk);
+        clk_enable(spi->clk);
+        tclk_hz = clk_get_rate(spi->clk);
+        spi->max_speed = DIV_ROUND_UP(tclk_hz, 4);
+        spi->min_speed = DIV_ROUND_UP(tclk_hz, 30);
 
         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (r == NULL) {
                 status = -ENODEV;
-                goto out;
+                goto out_rel_clk;
         }
 
         if (!request_mem_region(r->start, resource_size(r),
                                 dev_name(&pdev->dev))) {
                 status = -EBUSY;
-                goto out;
+                goto out_rel_clk;
         }
         spi->base = ioremap(r->start, SZ_1K);
 
@@ -508,7 +519,9 @@ static int __init orion_spi_probe(struct platform_device *pdev)
 
 out_rel_mem:
         release_mem_region(r->start, resource_size(r));
-
+out_rel_clk:
+        clk_disable_unprepare(spi->clk);
+        clk_put(spi->clk);
 out:
         spi_master_put(master);
         return status;
@@ -526,6 +539,9 @@ static int __exit orion_spi_remove(struct platform_device *pdev)
 
         cancel_work_sync(&spi->work);
 
+        clk_disable_unprepare(spi->clk);
+        clk_put(spi->clk);
+
         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         release_mem_region(r->start, resource_size(r));
 
diff --git a/drivers/usb/host/ehci-orion.c b/drivers/usb/host/ehci-orion.c
index 6c6a5a3b4ea7..82de1073aa52 100644
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/mbus.h>
+#include <linux/clk.h>
 #include <plat/ehci-orion.h>
 
 #define rdl(off)        __raw_readl(hcd->regs + (off))
@@ -198,6 +199,7 @@ static int __devinit ehci_orion_drv_probe(struct platform_device *pdev)
         struct resource *res;
         struct usb_hcd *hcd;
         struct ehci_hcd *ehci;
+        struct clk *clk;
         void __iomem *regs;
         int irq, err;
 
@@ -238,6 +240,14 @@ static int __devinit ehci_orion_drv_probe(struct platform_device *pdev)
                 goto err2;
         }
 
+        /* Not all platforms can gate the clock, so it is not
+           an error if the clock does not exists. */
+        clk = clk_get(&pdev->dev, NULL);
+        if (!IS_ERR(clk)) {
+                clk_prepare_enable(clk);
+                clk_put(clk);
+        }
+
         hcd = usb_create_hcd(&ehci_orion_hc_driver,
                         &pdev->dev, dev_name(&pdev->dev));
         if (!hcd) {
@@ -301,12 +311,18 @@ err1:
 static int __exit ehci_orion_drv_remove(struct platform_device *pdev)
 {
         struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct clk *clk;
 
         usb_remove_hcd(hcd);
         iounmap(hcd->regs);
         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
         usb_put_hcd(hcd);
 
+        clk = clk_get(&pdev->dev, NULL);
+        if (!IS_ERR(clk)) {
+                clk_disable_unprepare(clk);
+                clk_put(clk);
+        }
         return 0;
 }
 
diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index 788aa158e78c..0f5736949c61 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -24,8 +24,8 @@
 #include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/spinlock.h>
+#include <linux/clk.h>
 #include <mach/bridge-regs.h>
-#include <plat/orion_wdt.h>
 
 /*
  * Watchdog timer block registers.
@@ -41,6 +41,7 @@
 static bool nowayout = WATCHDOG_NOWAYOUT;
 static int heartbeat = -1;              /* module parameter (seconds) */
 static unsigned int wdt_max_duration;   /* (seconds) */
+static struct clk *clk;
 static unsigned int wdt_tclk;
 static void __iomem *wdt_reg;
 static unsigned long wdt_status;
@@ -237,16 +238,16 @@ static struct miscdevice orion_wdt_miscdev = {
 
 static int __devinit orion_wdt_probe(struct platform_device *pdev)
 {
-        struct orion_wdt_platform_data *pdata = pdev->dev.platform_data;
         struct resource *res;
         int ret;
 
-        if (pdata) {
-                wdt_tclk = pdata->tclk;
-        } else {
-                pr_err("misses platform data\n");
+        clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(clk)) {
+                printk(KERN_ERR "Orion Watchdog missing clock\n");
                 return -ENODEV;
         }
+        clk_prepare_enable(clk);
+        wdt_tclk = clk_get_rate(clk);
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 
@@ -282,6 +283,9 @@ static int __devexit orion_wdt_remove(struct platform_device *pdev)
         if (!ret)
                 orion_wdt_miscdev.parent = NULL;
 
+        clk_disable_unprepare(clk);
+        clk_put(clk);
+
         return ret;
 }
 
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index c1c23b9ec368..4a0b483986c3 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -312,6 +312,8 @@ struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
  */
 struct clk *clk_register(struct device *dev, struct clk_hw *hw);
 
+void clk_unregister(struct clk *clk);
+
 /* helper functions */
 const char *__clk_get_name(struct clk *clk);
 struct clk_hw *__clk_get_hw(struct clk *clk);
diff --git a/include/linux/mv643xx_eth.h b/include/linux/mv643xx_eth.h
index 30b0c4e78f91..51bf8ada6dc0 100644
--- a/include/linux/mv643xx_eth.h
+++ b/include/linux/mv643xx_eth.h
@@ -18,7 +18,6 @@
 struct mv643xx_eth_shared_platform_data {
         struct mbus_dram_target_info    *dram;
         struct platform_device  *shared_smi;
-        unsigned int            t_clk;
         /*
          * Max packet size for Tx IP/Layer 4 checksum, when set to 0, default
          * limit of 9KiB will be used.
diff --git a/include/linux/spi/orion_spi.h b/include/linux/spi/orion_spi.h
deleted file mode 100644
index b4d9fa6f797c..000000000000
--- a/include/linux/spi/orion_spi.h
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * orion_spi.h
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- */
-
-#ifndef __LINUX_SPI_ORION_SPI_H
-#define __LINUX_SPI_ORION_SPI_H
-
-struct orion_spi_info {
-        u32     tclk;           /* no <linux/clk.h> support yet */
-};
-
-
-#endif
diff --git a/sound/soc/kirkwood/kirkwood-i2s.c b/sound/soc/kirkwood/kirkwood-i2s.c
index 3cb9aa4299d3..fa4556750451 100644
--- a/sound/soc/kirkwood/kirkwood-i2s.c
+++ b/sound/soc/kirkwood/kirkwood-i2s.c
@@ -17,6 +17,7 @@
 #include <linux/slab.h>
 #include <linux/mbus.h>
 #include <linux/delay.h>
+#include <linux/clk.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -449,6 +450,14 @@ static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 
         priv->burst = data->burst;
 
+        priv->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(priv->clk)) {
+                dev_err(&pdev->dev, "no clock\n");
+                err = PTR_ERR(priv->clk);
+                goto err_ioremap;
+        }
+        clk_prepare_enable(priv->clk);
+
         return snd_soc_register_dai(&pdev->dev, &kirkwood_i2s_dai);
 
 err_ioremap:
@@ -466,6 +475,10 @@ static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
         struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);
 
         snd_soc_unregister_dai(&pdev->dev);
+
+        clk_disable_unprepare(priv->clk);
+        clk_put(priv->clk);
+
         iounmap(priv->io);
         release_mem_region(priv->mem->start, SZ_16K);
         kfree(priv);
diff --git a/sound/soc/kirkwood/kirkwood.h b/sound/soc/kirkwood/kirkwood.h
index 9047436b3937..f9084d83e6bd 100644
--- a/sound/soc/kirkwood/kirkwood.h
+++ b/sound/soc/kirkwood/kirkwood.h
@@ -123,6 +123,7 @@ struct kirkwood_dma_data {
         void __iomem *io;
         int irq;
         int burst;
+        struct clk *clk;
 };
 
 #endif