ARM: dts: imx6sl-evk: Add headphone detection for sound card

Headphone detection is triggered by GPIO, then driver can
switch between speaker and headphone.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

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

@@ -94,6 +94,8 @@ reg_lcd_5v: regulator-lcd-5v {
 
 	sound {
 		compatible = "fsl,imx6sl-evk-wm8962", "fsl,imx-audio-wm8962";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_hp>;
 		model = "wm8962-audio";
 		ssi-controller = <&ssi2>;
 		audio-codec = <&codec>;
@@ -106,6 +108,7 @@ sound {
 			"IN3R", "AMIC";
 		mux-int-port = <2>;
 		mux-ext-port = <3>;
+		hp-det-gpio = <&gpio4 19 GPIO_ACTIVE_LOW>;
 	};
 
 	panel {
@@ -343,6 +346,12 @@ MX6SL_PAD_FEC_REF_CLK__GPIO4_IO26  0x3080
 			>;
 		};
 
+		pinctrl_hp: hpgrp {
+			fsl,pins = <
+				MX6SL_PAD_FEC_RX_ER__GPIO4_IO19	  0x1b0b0
+			>;
+		};
+
 		pinctrl_i2c1: i2c1grp {
 			fsl,pins = <
 				MX6SL_PAD_I2C1_SCL__I2C1_SCL	0x4001b8b1