[PATCH] ARM: mx27: Print silicon revision on boot

[Fabio Estevam]

Silicon revision is useful information to have during kernel boot.

Print the MX27 silicon revision.

Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
---
 arch/arm/mach-imx/clock-imx27.c       |    1 +
 arch/arm/mach-imx/cpu-imx27.c         |   23 +++++++++++++++++++++++
 arch/arm/plat-mxc/include/mach/mx27.h |    1 +
 3 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-imx/clock-imx27.c b/arch/arm/mach-imx/clock-imx27.c
index 6912b82..2858137 100644
--- a/arch/arm/mach-imx/clock-imx27.c
+++ b/arch/arm/mach-imx/clock-imx27.c
@@ -756,6 +756,7 @@ int __init mx27_clocks_init(unsigned long fref)
 	clk_enable(&uart1_clk);
 #endif
 
+	mx27_read_cpu_rev();
 	mxc_timer_init(&gpt1_clk, MX27_IO_ADDRESS(MX27_GPT1_BASE_ADDR),
 			MX27_INT_GPT1);
 
diff --git a/arch/arm/mach-imx/cpu-imx27.c b/arch/arm/mach-imx/cpu-imx27.c
index 3b117be..8f6495e 100644
--- a/arch/arm/mach-imx/cpu-imx27.c
+++ b/arch/arm/mach-imx/cpu-imx27.c
@@ -74,3 +74,26 @@ int mx27_revision(void)
 	return cpu_silicon_rev;
 }
 EXPORT_SYMBOL(mx27_revision);
+
+void __init mx27_read_cpu_rev(void)
+{
+	u32 rev;
+	char *srev;
+
+	rev = mx27_revision();
+	switch (rev) {
+	case IMX_CHIP_REVISION_1_0:
+		srev = IMX_CHIP_REVISION_1_0_STRING;
+		break;
+	case IMX_CHIP_REVISION_2_0:
+		srev = IMX_CHIP_REVISION_2_0_STRING;
+		break;
+	case IMX_CHIP_REVISION_2_1:
+		srev = IMX_CHIP_REVISION_2_1_STRING;
+		break;
+	default:
+		srev = IMX_CHIP_REVISION_UNKNOWN_STRING;
+	}
+
+	pr_info("CPU identified as i.MX27, silicon rev %s\n", srev);
+}
diff --git a/arch/arm/plat-mxc/include/mach/mx27.h b/arch/arm/plat-mxc/include/mach/mx27.h
index 1dc1c52..76edec7 100644
--- a/arch/arm/plat-mxc/include/mach/mx27.h
+++ b/arch/arm/plat-mxc/include/mach/mx27.h
@@ -246,6 +246,7 @@ static inline void mx27_setup_weimcs(size_t cs,
 
 #ifndef __ASSEMBLY__
 extern int mx27_revision(void);
+extern void mx27_read_cpu_rev(void);
 #endif
 
 #endif /* ifndef __MACH_MX27_H__ */
-- 
1.7.1