diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index 87e86a4a9ead..3ab5df1ce900 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -336,6 +336,27 @@ static void omap44xx_prm_reconfigure_io_chain(void)
 	return;
 }
 
+/**
+ * omap44xx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
+ *
+ * Activates the I/O wakeup event latches and allows events logged by
+ * those latches to signal a wakeup event to the PRCM.  For I/O wakeups
+ * to occur, WAKEUPENABLE bits must be set in the pad mux registers, and
+ * omap44xx_prm_reconfigure_io_chain() must be called.  No return value.
+ */
+static void __init omap44xx_prm_enable_io_wakeup(void)
+{
+	s32 inst = omap4_prmst_get_prm_dev_inst();
+
+	if (inst == PRM_INSTANCE_UNKNOWN)
+		return;
+
+	omap4_prm_rmw_inst_reg_bits(OMAP4430_GLOBAL_WUEN_MASK,
+				    OMAP4430_GLOBAL_WUEN_MASK,
+				    inst,
+				    omap4_prcm_irq_setup.pm_ctrl);
+}
+
 /**
  * omap44xx_prm_read_reset_sources - return the last SoC reset source
  *
@@ -668,6 +689,8 @@ struct pwrdm_ops omap4_pwrdm_operations = {
 	.pwrdm_has_voltdm	= omap4_check_vcvp,
 };
 
+static int omap44xx_prm_late_init(void);
+
 /*
  * XXX document
  */
@@ -675,6 +698,7 @@ static struct prm_ll_data omap44xx_prm_ll_data = {
 	.read_reset_sources = &omap44xx_prm_read_reset_sources,
 	.was_any_context_lost_old = &omap44xx_prm_was_any_context_lost_old,
 	.clear_context_loss_flags_old = &omap44xx_prm_clear_context_loss_flags_old,
+	.late_init = &omap44xx_prm_late_init,
 	.assert_hardreset	= omap4_prminst_assert_hardreset,
 	.deassert_hardreset	= omap4_prminst_deassert_hardreset,
 	.is_hardreset_asserted	= omap4_prminst_is_hardreset_asserted,
@@ -711,6 +735,37 @@ int __init omap44xx_prm_init(const struct omap_prcm_init_data *data)
 	return prm_register(&omap44xx_prm_ll_data);
 }
 
+static int omap44xx_prm_late_init(void)
+{
+	int irq_num;
+
+	if (!(prm_features & PRM_HAS_IO_WAKEUP))
+		return 0;
+
+	irq_num = of_irq_get(prm_init_data->np, 0);
+	/*
+	 * Already have OMAP4 IRQ num. For all other platforms, we need
+	 * IRQ numbers from DT
+	 */
+	if (irq_num < 0 && !(prm_init_data->flags & PRM_IRQ_DEFAULT)) {
+		if (irq_num == -EPROBE_DEFER)
+			return irq_num;
+
+		/* Have nothing to do */
+		return 0;
+	}
+
+	/* Once OMAP4 DT is filled as well */
+	if (irq_num >= 0) {
+		omap4_prcm_irq_setup.irq = irq_num;
+		omap4_prcm_irq_setup.xlate_irq = NULL;
+	}
+
+	omap44xx_prm_enable_io_wakeup();
+
+	return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
+}
+
 static void __exit omap44xx_prm_exit(void)
 {
 	prm_unregister(&omap44xx_prm_ll_data);