diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index d78c12e7cb5e..2ceed3192f22 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -299,7 +299,20 @@ static void _write_sysconfig(u32 v, struct omap_hwmod *oh)
 
 	/* Module might have lost context, always update cache and register */
 	oh->_sysc_cache = v;
+
+	/*
+	 * Some IP blocks (such as RTC) require unlocking of IP before
+	 * accessing its registers. If a function pointer is present
+	 * to unlock, then call it before accessing sysconfig and
+	 * call lock after writing sysconfig.
+	 */
+	if (oh->class->unlock)
+		oh->class->unlock(oh);
+
 	omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs);
+
+	if (oh->class->lock)
+		oh->class->lock(oh);
 }
 
 /**
diff --git a/arch/arm/mach-omap2/omap_hwmod.h b/arch/arm/mach-omap2/omap_hwmod.h
index b5d27ec81610..13f390202c60 100644
--- a/arch/arm/mach-omap2/omap_hwmod.h
+++ b/arch/arm/mach-omap2/omap_hwmod.h
@@ -576,6 +576,8 @@ struct omap_hwmod_omap4_prcm {
  * @pre_shutdown: ptr to fn to be executed immediately prior to device shutdown
  * @reset: ptr to fn to be executed in place of the standard hwmod reset fn
  * @enable_preprogram:  ptr to fn to be executed during device enable
+ * @lock: ptr to fn to be executed to lock IP registers
+ * @unlock: ptr to fn to be executed to unlock IP registers
  *
  * Represent the class of a OMAP hardware "modules" (e.g. timer,
  * smartreflex, gpio, uart...)
@@ -600,6 +602,8 @@ struct omap_hwmod_class {
 	int					(*pre_shutdown)(struct omap_hwmod *oh);
 	int					(*reset)(struct omap_hwmod *oh);
 	int					(*enable_preprogram)(struct omap_hwmod *oh);
+	void					(*lock)(struct omap_hwmod *oh);
+	void					(*unlock)(struct omap_hwmod *oh);
 };
 
 /**