ARM: dts: am57xx-idk: Add Industrial input support

The SN65HVS882 is available on both the AM572x and AM571x IDKs and is
attached to SPI1. Input is attached to the I/O header. The load trigger
is attached to GPIO3_19 on the AM572x IDK.
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am572x-idk.dts

@@ -83,3 +83,7 @@ &mmc1 {
 	bus-width = <4>;
 	cd-gpios = <&gpio6 27 0>; /* gpio 219 */
 };
+
+&sn65hvs882 {
+	load-gpios = <&gpio3 19 GPIO_ACTIVE_LOW>;
+};

arch/arm/boot/dts/am57xx-idk-common.dtsi

@@ -253,6 +253,21 @@ tps659038_gpio: tps659038_gpio {
 	};
 };
 
+&mcspi3 {
+	status = "okay";
+	ti,pindir-d0-out-d1-in;
+
+	sn65hvs882: sn65hvs882@0 {
+		compatible = "pisosr-gpio";
+		gpio-controller;
+		#gpio-cells = <2>;
+
+		reg = <0>;
+		spi-max-frequency = <1000000>;
+		spi-cpol;
+	};
+};
+
 &uart3 {
 	status = "okay";
 	interrupts-extended = <&crossbar_mpu GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH