OMAP3: PM: enable gptimer12 as a wakeup source

GPT12 is in the WKUP powerdomain and can be useful as the system timer
and thus a wakeup source for sleep while idle.
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-omap2/pm34xx.c

@@ -505,10 +505,12 @@ static void __init prcm_setup_regs(void)
 			     OMAP3_PRM_CLKSRC_CTRL_OFFSET);
 
 	/* setup wakup source */
-	prm_write_mod_reg(OMAP3430_EN_IO | OMAP3430_EN_GPIO1 | OMAP3430_EN_GPT1,
+	prm_write_mod_reg(OMAP3430_EN_IO | OMAP3430_EN_GPIO1 |
+			  OMAP3430_EN_GPT1 | OMAP3430_EN_GPT12,
 			  WKUP_MOD, PM_WKEN);
 	/* No need to write EN_IO, that is always enabled */
-	prm_write_mod_reg(OMAP3430_EN_GPIO1 | OMAP3430_EN_GPT1,
+	prm_write_mod_reg(OMAP3430_EN_GPIO1 | OMAP3430_EN_GPT1 |
+			  OMAP3430_EN_GPT12,
 			  WKUP_MOD, OMAP3430_PM_MPUGRPSEL);
 	/* For some reason IO doesn't generate wakeup event even if
 	 * it is selected to mpu wakeup goup */

arch/arm/mach-omap2/prcm-common.h

@@ -276,6 +276,8 @@
 /* CM_FCLKEN_WKUP, CM_ICLKEN_WKUP, PM_WKEN_WKUP shared bits */
 #define OMAP3430_EN_GPIO1				(1 << 3)
 #define OMAP3430_EN_GPIO1_SHIFT				3
+#define OMAP3430_EN_GPT12				(1 << 1)
+#define OMAP3430_EN_GPT12_SHIFT				1
 #define OMAP3430_EN_GPT1				(1 << 0)
 #define OMAP3430_EN_GPT1_SHIFT				0