ARM i.MX31: Add devicetree support

This patch adds basic devicetree support for i.MX31 based SoCs.

Only the UART and interrupts bindings are added.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

6 files changed, 180 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/imx31.dtsi b/arch/arm/boot/dts/imx31.dtsi
new file mode 100644
index 000000000000..eef7099f3e3c
--- /dev/null
+++ b/arch/arm/boot/dts/imx31.dtsi
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2012 Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+/include/ "skeleton.dtsi"
+
+/ {
+        aliases {
+                serial0 = &uart1;
+                serial1 = &uart2;
+                serial2 = &uart3;
+                serial3 = &uart4;
+                serial4 = &uart5;
+        };
+
+        avic: avic-interrupt-controller@60000000 {
+                compatible = "fsl,imx31-avic", "fsl,avic";
+                interrupt-controller;
+                #interrupt-cells = <1>;
+                reg = <0x60000000 0x100000>;
+        };
+
+        soc {
+                #address-cells = <1>;
+                #size-cells = <1>;
+                compatible = "simple-bus";
+                interrupt-parent = <&avic>;
+                ranges;
+
+                aips@43f00000 { /* AIPS1 */
+                        compatible = "fsl,aips-bus", "simple-bus";
+                        #address-cells = <1>;
+                        #size-cells = <1>;
+                        reg = <0x43f00000 0x100000>;
+                        ranges;
+
+                        uart1: serial@43f90000 {
+                                compatible = "fsl,imx31-uart", "fsl,imx21-uart";
+                                reg = <0x43f90000 0x4000>;
+                                interrupts = <45>;
+                                status = "disabled";
+                        };
+
+                        uart2: serial@43f94000 {
+                                compatible = "fsl,imx31-uart", "fsl,imx21-uart";
+                                reg = <0x43f94000 0x4000>;
+                                interrupts = <32>;
+                                status = "disabled";
+                        };
+
+                        uart4: serial@43fb0000 {
+                                compatible = "fsl,imx31-uart", "fsl,imx21-uart";
+                                reg = <0x43fb0000 0x4000>;
+                                interrupts = <46>;
+                                status = "disabled";
+                        };
+
+                        uart5: serial@43fb4000 {
+                                compatible = "fsl,imx31-uart", "fsl,imx21-uart";
+                                reg = <0x43fb4000 0x4000>;
+                                interrupts = <47>;
+                                status = "disabled";
+                        };
+                };
+
+                spba@50000000 {
+                        compatible = "fsl,spba-bus", "simple-bus";
+                        #address-cells = <1>;
+                        #size-cells = <1>;
+                        reg = <0x50000000 0x100000>;
+                        ranges;
+
+                        uart3: serial@5000c000 {
+                                compatible = "fsl,imx31-uart", "fsl,imx21-uart";
+                                reg = <0x5000c000 0x4000>;
+                                interrupts = <18>;
+                                status = "disabled";
+                        };
+                };
+        };
+};
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index eff4db5de0dd..46f5c3fc9276 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -557,6 +557,14 @@ config MACH_BUG
           Include support for BUGBase 1.3 platform. This includes specific
           configurations for the board and its peripherals.
 
+config MACH_IMX31_DT
+        bool "Support i.MX31 platforms from device tree"
+        select SOC_IMX31
+        select USE_OF
+        help
+          Include support for Freescale i.MX31 based platforms
+          using the device tree for discovery.
+
 comment "MX35 platforms:"
 
 config MACH_PCM043
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index ff29421414f2..07f7c226e4cf 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_MACH_QONG) += mach-qong.o
 obj-$(CONFIG_MACH_ARMADILLO5X0) += mach-armadillo5x0.o
 obj-$(CONFIG_MACH_KZM_ARM11_01) += mach-kzm_arm11_01.o
 obj-$(CONFIG_MACH_BUG) += mach-bug.o
+obj-$(CONFIG_MACH_IMX31_DT) += imx31-dt.o
 
 # i.MX35 based machines
 obj-$(CONFIG_MACH_PCM043) += mach-pcm043.o
diff --git a/arch/arm/mach-imx/clk-imx31.c b/arch/arm/mach-imx/clk-imx31.c
index c9a06d800f8e..f87a48fc74e1 100644
--- a/arch/arm/mach-imx/clk-imx31.c
+++ b/arch/arm/mach-imx/clk-imx31.c
@@ -20,6 +20,7 @@
 #include <linux/clkdev.h>
 #include <linux/io.h>
 #include <linux/err.h>
+#include <linux/of.h>
 
 #include <mach/hardware.h>
 #include <mach/mx31.h>
@@ -179,3 +180,21 @@ int __init mx31_clocks_init(unsigned long fref)
 
         return 0;
 }
+
+#ifdef CONFIG_OF
+int __init mx31_clocks_init_dt(void)
+{
+        struct device_node *np;
+        u32 fref = 26000000; /* default */
+
+        for_each_compatible_node(np, NULL, "fixed-clock") {
+                if (!of_device_is_compatible(np, "fsl,imx-osc26m"))
+                        continue;
+
+                if (!of_property_read_u32(np, "clock-frequency", &fref))
+                        break;
+        }
+
+        return mx31_clocks_init(fref);
+}
+#endif
diff --git a/arch/arm/mach-imx/imx31-dt.c b/arch/arm/mach-imx/imx31-dt.c
new file mode 100644
index 000000000000..a68ba207b2b7
--- /dev/null
+++ b/arch/arm/mach-imx/imx31-dt.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2012 Sascha Hauer, Pengutronix
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/irq.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+#include <mach/common.h>
+#include <mach/mx31.h>
+
+static const struct of_dev_auxdata imx31_auxdata_lookup[] __initconst = {
+        OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART1_BASE_ADDR,
+                        "imx21-uart.0", NULL),
+        OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART2_BASE_ADDR,
+                        "imx21-uart.1", NULL),
+        OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART3_BASE_ADDR,
+                        "imx21-uart.2", NULL),
+        OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART4_BASE_ADDR,
+                        "imx21-uart.3", NULL),
+        OF_DEV_AUXDATA("fsl,imx31-uart", MX31_UART5_BASE_ADDR,
+                        "imx21-uart.4", NULL),
+        { /* sentinel */ }
+};
+
+static void __init imx31_dt_init(void)
+{
+        of_platform_populate(NULL, of_default_bus_match_table,
+                             imx31_auxdata_lookup, NULL);
+}
+
+static void __init imx31_timer_init(void)
+{
+        mx31_clocks_init_dt();
+}
+
+static struct sys_timer imx31_timer = {
+        .init = imx31_timer_init,
+};
+
+static const char *imx31_dt_board_compat[] __initdata = {
+        "fsl,imx31",
+        NULL
+};
+
+DT_MACHINE_START(IMX31_DT, "Freescale i.MX31 (Device Tree Support)")
+        .map_io         = mx31_map_io,
+        .init_early     = imx31_init_early,
+        .init_irq       = mx31_init_irq,
+        .handle_irq     = imx31_handle_irq,
+        .timer          = &imx31_timer,
+        .init_machine   = imx31_dt_init,
+        .dt_compat      = imx31_dt_board_compat,
+        .restart        = mxc_restart,
+MACHINE_END
diff --git a/arch/arm/plat-mxc/include/mach/common.h b/arch/arm/plat-mxc/include/mach/common.h
index e429ca1b814a..7cfcc44537f0 100644
--- a/arch/arm/plat-mxc/include/mach/common.h
+++ b/arch/arm/plat-mxc/include/mach/common.h
@@ -67,6 +67,7 @@ extern int mx51_clocks_init(unsigned long ckil, unsigned long osc,
 extern int mx53_clocks_init(unsigned long ckil, unsigned long osc,
                         unsigned long ckih1, unsigned long ckih2);
 extern int mx27_clocks_init_dt(void);
+extern int mx31_clocks_init_dt(void);
 extern int mx51_clocks_init_dt(void);
 extern int mx53_clocks_init_dt(void);
 extern int mx6q_clocks_init(void);