ARM: mx35: use generic function for displaying silicon revision

update to use generic function for displaying silicon revision

Signed-off-by: Jason Liu <jason.hui@linaro.org>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 14 insertions, 16 deletions

diff --git a/arch/arm/mach-imx/cpu-imx35.c b/arch/arm/mach-imx/cpu-imx35.c
index 6637cd819ecb..846e46eb8cbf 100644
--- a/arch/arm/mach-imx/cpu-imx35.c
+++ b/arch/arm/mach-imx/cpu-imx35.c
@@ -13,32 +13,30 @@
 #include <mach/hardware.h>
 #include <mach/iim.h>
 
-unsigned int mx35_cpu_rev;
-EXPORT_SYMBOL(mx35_cpu_rev);
+static int mx35_cpu_rev = -1;
 
-void __init mx35_read_cpu_rev(void)
+static int mx35_read_cpu_rev(void)
 {
         u32 rev;
-        char *srev;
 
         rev = __raw_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
         switch (rev) {
         case 0x00:
-                mx35_cpu_rev = IMX_CHIP_REVISION_1_0;
-                srev = "1.0";
-                break;
+                return IMX_CHIP_REVISION_1_0;
         case 0x10:
-                mx35_cpu_rev = IMX_CHIP_REVISION_2_0;
-                srev = "2.0";
-                break;
+                return IMX_CHIP_REVISION_2_0;
         case 0x11:
-                mx35_cpu_rev = IMX_CHIP_REVISION_2_1;
-                srev = "2.1";
-                break;
+                return IMX_CHIP_REVISION_2_1;
         default:
-                mx35_cpu_rev = IMX_CHIP_REVISION_UNKNOWN;
-                srev = "unknown";
+                return IMX_CHIP_REVISION_UNKNOWN;
         }
+}
+
+int mx35_revision(void)
+{
+        if (mx35_cpu_rev == -1)
+                mx35_cpu_rev = mx35_read_cpu_rev();
 
-        printk(KERN_INFO "CPU identified as i.MX35, silicon rev %s\n", srev);
+        return mx35_cpu_rev;
 }
+EXPORT_SYMBOL(mx35_revision);