ARM: dts: imx6sl: add keypad support for i.mx6sl-evk board.

i.MX6SL EVK board has a 3*3 keypad matrix to support 8 keypads,
enable them, the keymap is as below:

SW6:  MATRIX_KEY(0x0, 0x0, KEY_UP)         /* ROW0, COL0 */
SW7:  MATRIX_KEY(0x0, 0x1, KEY_DOWN)       /* ROW0, COL1 */
SW8:  MATRIX_KEY(0x0, 0x2, KEY_ENTER)      /* ROW0, COL2 */
SW9:  MATRIX_KEY(0x1, 0x0, KEY_HOME)       /* ROW1, COL0 */
SW10: MATRIX_KEY(0x1, 0x1, KEY_RIGHT)      /* ROW1, COL1 */
SW11: MATRIX_KEY(0x1, 0x2, KEY_LEFT)       /* ROW1, COL2 */
SW12: MATRIX_KEY(0x2, 0x0, KEY_VOLUMEDOWN) /* ROW2, COL0 */
SW13: MATRIX_KEY(0x2, 0x1, KEY_VOLUMEUP)   /* ROW2, COL1 */

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx6sl-evk.dts

@@ -8,6 +8,7 @@
 
 /dts-v1/;
 
+#include <dt-bindings/input/input.h>
 #include "imx6sl.dtsi"
 
 / {
@@ -107,6 +108,17 @@
 			>;
 		};
 
+		pinctrl_kpp: kppgrp {
+			fsl,pins = <
+				MX6SL_PAD_KEY_ROW0__KEY_ROW0    0x1b010
+				MX6SL_PAD_KEY_ROW1__KEY_ROW1    0x1b010
+				MX6SL_PAD_KEY_ROW2__KEY_ROW2    0x1b0b0
+				MX6SL_PAD_KEY_COL0__KEY_COL0    0x110b0
+				MX6SL_PAD_KEY_COL1__KEY_COL1    0x110b0
+				MX6SL_PAD_KEY_COL2__KEY_COL2    0x110b0
+			>;
+		};
+
 		pinctrl_uart1: uart1grp {
 			fsl,pins = <
 				MX6SL_PAD_UART1_RXD__UART1_RX_DATA	0x1b0b1
@@ -233,6 +245,22 @@
 	};
 };
 
+&kpp {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_kpp>;
+	linux,keymap = <
+			MATRIX_KEY(0x0, 0x0, KEY_UP)         /* ROW0, COL0 */
+			MATRIX_KEY(0x0, 0x1, KEY_DOWN)       /* ROW0, COL1 */
+			MATRIX_KEY(0x0, 0x2, KEY_ENTER)      /* ROW0, COL2 */
+			MATRIX_KEY(0x1, 0x0, KEY_HOME)       /* ROW1, COL0 */
+			MATRIX_KEY(0x1, 0x1, KEY_RIGHT)      /* ROW1, COL1 */
+			MATRIX_KEY(0x1, 0x2, KEY_LEFT)       /* ROW1, COL2 */
+			MATRIX_KEY(0x2, 0x0, KEY_VOLUMEDOWN) /* ROW2, COL0 */
+			MATRIX_KEY(0x2, 0x1, KEY_VOLUMEUP)   /* ROW2, COL1 */
+	>;
+	status = "okay";
+};
+
 &uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>;

arch/arm/boot/dts/imx6sl.dtsi

@@ -392,8 +392,10 @@
 			};
 
 			kpp: kpp@020b8000 {
+				compatible = "fsl,imx6sl-kpp", "fsl,imx21-kpp";
 				reg = <0x020b8000 0x4000>;
 				interrupts = <0 82 IRQ_TYPE_LEVEL_HIGH>;
+				clocks = <&clks IMX6SL_CLK_DUMMY>;
 			};
 
 			wdog1: wdog@020bc000 {