ARM: dts: qcom: msm8974-klte: Add gpio expander chip

The Samsung Galaxy S5 has a GPIO Expander chip, the PCAL6416A with 16
ports on a i2c bus. These pins are used for WiFi, NFC, IR among other
things.
Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Link: https://lore.kernel.org/r/20200920144859.813032-6-iskren.chernev@gmail.comSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm/boot/dts/qcom-msm8974-samsung-klte.dts

@@ -236,10 +236,25 @@ i2c-gpio-led {
 		scl-gpios = <&msmgpio 121 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 		sda-gpios = <&msmgpio 120 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 		pinctrl-names = "default";
-		pinctrl-0 = <&i2c_led_pins>;
+		pinctrl-0 = <&i2c_led_gpioex_pins>;
 
 		i2c-gpio,delay-us = <2>;
 
+		gpio_expander: gpio@20 {
+			compatible = "nxp,pcal6416";
+			reg = <0x20>;
+
+			gpio-controller;
+			#gpio-cells = <2>;
+
+			vcc-supply = <&pma8084_s4>;
+
+			pinctrl-names = "default";
+			pinctrl-0 = <&gpioex_pin>;
+
+			reset-gpios = <&msmgpio 145 GPIO_ACTIVE_LOW>;
+		};
+
 		led-controller@30 {
 			compatible = "panasonic,an30259a";
 			reg = <0x30>;
@@ -352,7 +367,7 @@ mux {
 			};
 		};
 
-		i2c_led_pins: i2c-led {
+		i2c_led_gpioex_pins: i2c-led-gpioex {
 			mux {
 				pins = "gpio120", "gpio121";
 				function = "gpio";
@@ -360,6 +375,16 @@ mux {
 				bias-pull-down;
 			};
 		};
+
+		gpioex_pin: gpioex {
+			res {
+				pins = "gpio145";
+				function = "gpio";
+
+				bias-pull-up;
+				drive-strength = <2>;
+			};
+		};
 	};
 
 	sdhci@f9824900 {