omap3evm: Add board revision function

Added function to differentiate between the OMAP3EVM revisions. The
chip-id of the ethernet PHY is being used for this purpose.

Rev A to D : 0x01150000
Rev >= E   : 0x92200000

CC: Remy Bohmer <linux@bohmer.net>
Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Sanjeev Premi <premi@ti.com>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Acked-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/board/ti/evm/evm.h b/board/ti/evm/evm.h
index 37da29d..e2581f6 100644
--- a/board/ti/evm/evm.h
+++ b/board/ti/evm/evm.h
@@ -33,6 +33,20 @@
 #endif
 };
 
+/*
+ * OMAP35x EVM revision
+ * Run time detection of EVM revision is done by reading Ethernet
+ * PHY ID -
+ *      GEN_1   = 0x01150000
+ *      GEN_2   = 0x92200000
+ */
+enum {
+	OMAP3EVM_BOARD_GEN_1 = 0,	/* EVM Rev between  A - D */
+	OMAP3EVM_BOARD_GEN_2,		/* EVM Rev >= Rev E */
+};
+
+u8 get_omap3_evm_rev(void);
+
 static void setup_net_chip(void);
 
 /*