ARM: pxa168: added keypad wake clear event support for platform

Signed-off-by: Mark F. Brown <mark.brown314@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

arch/arm/mach-mmp/pxa168.c

@@ -136,6 +136,16 @@ struct sys_timer pxa168_timer = {
 	.init	= pxa168_timer_init,
 };
 
+void pxa168_clear_keypad_wakeup(void)
+{
+	uint32_t val;
+	uint32_t mask = APMU_PXA168_KP_WAKE_CLR;
+
+	/* wake event clear is needed in order to clear keypad interrupt */
+	val = __raw_readl(APMU_WAKE_CLR);
+	__raw_writel(val |  mask, APMU_WAKE_CLR);
+}
+
 /* on-chip devices */
 PXA168_DEVICE(uart1, "pxa2xx-uart", 0, UART1, 0xd4017000, 0x30, 21, 22);
 PXA168_DEVICE(uart2, "pxa2xx-uart", 1, UART2, 0xd4018000, 0x30, 23, 24);