ARM: dts: am335x: Guardian: Add keypad

 * Add support to guardian mt gpio keypad
Signed-off-by: Gireesh Hiremath <Gireesh.Hiremath@in.bosch.com>
Message-Id: <20220325100613.1494-4-Gireesh.Hiremath@in.bosch.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-guardian.dts

@@ -36,6 +36,13 @@ guardian_buttons: gpio-keys {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		select-button {
+			label = "guardian-select-button";
+			linux,code = <KEY_5>;
+			gpios = <&gpio1 31 GPIO_ACTIVE_LOW>;
+			wakeup-source;
+		};
+
 		power-button {
 			label = "guardian-power-button";
 			linux,code = <KEY_POWER>;
@@ -115,6 +122,22 @@ vmmcsd_fixed: regulator-3v3 {
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 	};
+
+	mt_keypad: mt_keypad@0 {
+		compatible = "gpio-mt-keypad";
+		debounce-delay-ms = <10>;
+		col-scan-delay-us = <2>;
+		keypad,num-lines = <5>;
+		linux,no-autorepeat;
+		gpio-activelow;
+		line-gpios = <
+			&gpio1 24 GPIO_ACTIVE_LOW    /*gpio_56*/
+			&gpio1 23 GPIO_ACTIVE_LOW    /*gpio_55*/
+			&gpio1 22 GPIO_ACTIVE_LOW    /*gpio_54*/
+			&gpio1 20 GPIO_ACTIVE_LOW    /*gpio_52*/
+			&gpio1 16 GPIO_ACTIVE_LOW    /*gpio_48*/
+		>;
+	};
 };
 
 &elm {
@@ -369,6 +392,7 @@ AM33XX_IOPAD(0x968, PIN_OUTPUT | MUX_MODE5)
 	guardian_button_pins: pinmux_guardian_button_pins {
 		pinctrl-single,pins = <
 			AM33XX_IOPAD(0x940, PIN_INPUT | MUX_MODE7) /* (M16) gmii1_rxd0.gpio2[21] */
+			AM33XX_IOPAD(0x884, PIN_INPUT | MUX_MODE7) /* (V9)  gpmc_csn2.gpio1[31] */
 		>;
 	};