msm: 8064: Add summary interrupt configuration for IO expander

The 4x3 gpio matrix keypad is connected over the SX150X expander 2.

Change-Id: Idef2b3a10cf957128cc1f250504ec1c93fe14827
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
diff --git a/arch/arm/mach-msm/board-8064.c b/arch/arm/mach-msm/board-8064.c
index 8135806..d08fe01 100644
--- a/arch/arm/mach-msm/board-8064.c
+++ b/arch/arm/mach-msm/board-8064.c
@@ -2356,6 +2356,7 @@
 };
 
 #define SX150X_EXP1_INT_N	PM8921_MPP_IRQ(PM8921_IRQ_BASE, 9)
+#define SX150X_EXP2_INT_N	MSM_GPIO_TO_INT(81)
 
 struct sx150x_platform_data mpq8064_sx150x_pdata[] = {
 	[SX150X_EXP1] = {
@@ -2375,7 +2376,8 @@
 		.io_pulldn_ena	= 0x0,
 		.io_open_drain_ena = 0x0,
 		.io_polarity	= 0,
-		.irq_summary	= -1,
+		.irq_summary	= SX150X_EXP2_INT_N,
+		.irq_base	= SX150X_EXP2_IRQ_BASE,
 	},
 	[SX150X_EXP3] = {
 		.gpio_base	= SX150X_EXP3_GPIO_BASE,