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>

1 files changed, 19 insertions, 0 deletions

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