clk: new driver for efm32 SoC

This patch adds support for the clocks provided by the Clock Management
Unit of Energy Micro's efm32 Giant Gecko SoCs including device tree
bindings.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

4 files changed, 135 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/clock/efm32-clock.txt b/Documentation/devicetree/bindings/clock/efm32-clock.txt
new file mode 100644
index 000000000000..263d293f6a10
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/efm32-clock.txt
@@ -0,0 +1,11 @@
+* Clock bindings for Energy Micro efm32 Giant Gecko's Clock Management Unit
+
+Required properties:
+- compatible: Should be "efm32gg,cmu"
+- reg: Base address and length of the register set
+- interrupts: Interrupt used by the CMU
+- #clock-cells: Should be <1>
+
+The clock consumer should specify the desired clock by having the clock ID in
+its "clocks" phandle cell. The header efm32-clk.h contains a list of available
+IDs.
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index df33820b45ec..7a10bc9a23e7 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_COMMON_CLK)	+= clk-composite.o
 
 # SoCs specific
 obj-$(CONFIG_ARCH_BCM2835)      += clk-bcm2835.o
+obj-$(CONFIG_ARCH_EFM32)        += clk-efm32gg.o
 obj-$(CONFIG_ARCH_NOMADIK)      += clk-nomadik.o
 obj-$(CONFIG_ARCH_HIGHBANK)     += clk-highbank.o
 obj-$(CONFIG_ARCH_NSPIRE)       += clk-nspire.o
diff --git a/drivers/clk/clk-efm32gg.c b/drivers/clk/clk-efm32gg.c
new file mode 100644
index 000000000000..bac2ddf49d02
--- /dev/null
+++ b/drivers/clk/clk-efm32gg.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2013 Pengutronix
+ * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ */
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <dt-bindings/clock/efm32-cmu.h>
+
+#define CMU_HFPERCLKEN0         0x44
+
+static struct clk *clk[37];
+static struct clk_onecell_data clk_data = {
+        .clks = clk,
+        .clk_num = ARRAY_SIZE(clk),
+};
+
+static int __init efm32gg_cmu_init(struct device_node *np)
+{
+        int i;
+        void __iomem *base;
+
+        for (i = 0; i < ARRAY_SIZE(clk); ++i)
+                clk[i] = ERR_PTR(-ENOENT);
+
+        base = of_iomap(np, 0);
+        if (!base) {
+                pr_warn("Failed to map address range for efm32gg,cmu node\n");
+                return -EADDRNOTAVAIL;
+        }
+
+        clk[clk_HFXO] = clk_register_fixed_rate(NULL, "HFXO", NULL,
+                        CLK_IS_ROOT, 48000000);
+
+        clk[clk_HFPERCLKUSART0] = clk_register_gate(NULL, "HFPERCLK.USART0",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 0, 0, NULL);
+        clk[clk_HFPERCLKUSART1] = clk_register_gate(NULL, "HFPERCLK.USART1",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 1, 0, NULL);
+        clk[clk_HFPERCLKUSART2] = clk_register_gate(NULL, "HFPERCLK.USART2",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 2, 0, NULL);
+        clk[clk_HFPERCLKUART0] = clk_register_gate(NULL, "HFPERCLK.UART0",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 3, 0, NULL);
+        clk[clk_HFPERCLKUART1] = clk_register_gate(NULL, "HFPERCLK.UART1",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 4, 0, NULL);
+        clk[clk_HFPERCLKTIMER0] = clk_register_gate(NULL, "HFPERCLK.TIMER0",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 5, 0, NULL);
+        clk[clk_HFPERCLKTIMER1] = clk_register_gate(NULL, "HFPERCLK.TIMER1",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 6, 0, NULL);
+        clk[clk_HFPERCLKTIMER2] = clk_register_gate(NULL, "HFPERCLK.TIMER2",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 7, 0, NULL);
+        clk[clk_HFPERCLKTIMER3] = clk_register_gate(NULL, "HFPERCLK.TIMER3",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 8, 0, NULL);
+        clk[clk_HFPERCLKACMP0] = clk_register_gate(NULL, "HFPERCLK.ACMP0",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 9, 0, NULL);
+        clk[clk_HFPERCLKACMP1] = clk_register_gate(NULL, "HFPERCLK.ACMP1",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 10, 0, NULL);
+        clk[clk_HFPERCLKI2C0] = clk_register_gate(NULL, "HFPERCLK.I2C0",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 11, 0, NULL);
+        clk[clk_HFPERCLKI2C1] = clk_register_gate(NULL, "HFPERCLK.I2C1",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 12, 0, NULL);
+        clk[clk_HFPERCLKGPIO] = clk_register_gate(NULL, "HFPERCLK.GPIO",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 13, 0, NULL);
+        clk[clk_HFPERCLKVCMP] = clk_register_gate(NULL, "HFPERCLK.VCMP",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 14, 0, NULL);
+        clk[clk_HFPERCLKPRS] = clk_register_gate(NULL, "HFPERCLK.PRS",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 15, 0, NULL);
+        clk[clk_HFPERCLKADC0] = clk_register_gate(NULL, "HFPERCLK.ADC0",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 16, 0, NULL);
+        clk[clk_HFPERCLKDAC0] = clk_register_gate(NULL, "HFPERCLK.DAC0",
+                        "HFXO", 0, base + CMU_HFPERCLKEN0, 17, 0, NULL);
+
+        return of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
+}
+CLK_OF_DECLARE(efm32ggcmu, "efm32gg,cmu", efm32gg_cmu_init);
diff --git a/include/dt-bindings/clock/efm32-cmu.h b/include/dt-bindings/clock/efm32-cmu.h
new file mode 100644
index 000000000000..b21b91e736af
--- /dev/null
+++ b/include/dt-bindings/clock/efm32-cmu.h
@@ -0,0 +1,42 @@
+#ifndef __DT_BINDINGS_CLOCK_EFM32_CMU_H
+#define __DT_BINDINGS_CLOCK_EFM32_CMU_H
+
+#define clk_HFXO                0
+#define clk_HFRCO               1
+#define clk_LFXO                2
+#define clk_LFRCO               3
+#define clk_ULFRCO              4
+#define clk_AUXHFRCO            5
+#define clk_HFCLKNODIV          6
+#define clk_HFCLK               7
+#define clk_HFPERCLK            8
+#define clk_HFCORECLK           9
+#define clk_LFACLK              10
+#define clk_LFBCLK              11
+#define clk_WDOGCLK             12
+#define clk_HFCORECLKDMA        13
+#define clk_HFCORECLKAES        14
+#define clk_HFCORECLKUSBC       15
+#define clk_HFCORECLKUSB        16
+#define clk_HFCORECLKLE         17
+#define clk_HFCORECLKEBI        18
+#define clk_HFPERCLKUSART0      19
+#define clk_HFPERCLKUSART1      20
+#define clk_HFPERCLKUSART2      21
+#define clk_HFPERCLKUART0       22
+#define clk_HFPERCLKUART1       23
+#define clk_HFPERCLKTIMER0      24
+#define clk_HFPERCLKTIMER1      25
+#define clk_HFPERCLKTIMER2      26
+#define clk_HFPERCLKTIMER3      27
+#define clk_HFPERCLKACMP0       28
+#define clk_HFPERCLKACMP1       29
+#define clk_HFPERCLKI2C0        30
+#define clk_HFPERCLKI2C1        31
+#define clk_HFPERCLKGPIO        32
+#define clk_HFPERCLKVCMP        33
+#define clk_HFPERCLKPRS         34
+#define clk_HFPERCLKADC0        35
+#define clk_HFPERCLKDAC0        36
+
+#endif /* __DT_BINDINGS_CLOCK_EFM32_CMU_H */