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path: root/arch/arm/boot/dts/ads7846-overlay.dts
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/*
 * Generic Device Tree overlay for the ADS7846 touch controller
 *
 */

/dts-v1/;
/plugin/;

/ {
	compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";

	fragment@0 {
		target = <&spi0>;
		__overlay__ {
			status = "okay";

			spidev@0{
				status = "disabled";
			};

			spidev@1{
				status = "disabled";
			};
		};
	};

	fragment@1 {
		target = <&gpio>;
		__overlay__ {
			ads7846_pins: ads7846_pins {
				brcm,pins = <255>; /* illegal default value */
				brcm,function = <0>; /* in */
				brcm,pull = <0>; /* none */
			};
		};
	};

	fragment@2 {
		target = <&spi0>;
		__overlay__ {
			/* needed to avoid dtc warning */
			#address-cells = <1>;
			#size-cells = <0>;

			ads7846: ads7846@1 {
				compatible = "ti,ads7846";
				reg = <1>;
				pinctrl-names = "default";
				pinctrl-0 = <&ads7846_pins>;

				spi-max-frequency = <2000000>;
				interrupts = <255 2>; /* high-to-low edge triggered */
				interrupt-parent = <&gpio>;
				pendown-gpio = <&gpio 255 0>;

				/* driver defaults */
				ti,x-min = /bits/ 16 <0>;
				ti,y-min = /bits/ 16 <0>;
				ti,x-max = /bits/ 16 <0x0FFF>;
				ti,y-max = /bits/ 16 <0x0FFF>;
				ti,pressure-min = /bits/ 16 <0>;
				ti,pressure-max = /bits/ 16 <0xFFFF>;
				ti,x-plate-ohms = /bits/ 16 <400>;
			};
		};
	};
	__overrides__ {
		cs =     <&ads7846>,"reg:0";
		speed =  <&ads7846>,"spi-max-frequency:0";
		penirq = <&ads7846_pins>,"brcm,pins:0", /* REQUIRED */
			 <&ads7846>,"interrupts:0",
			 <&ads7846>,"pendown-gpio:4";
		penirq_pull = <&ads7846_pins>,"brcm,pull:0";
		swapxy = <&ads7846>,"ti,swap-xy?";
		xmin =   <&ads7846>,"ti,x-min;0";
		ymin =   <&ads7846>,"ti,y-min;0";
		xmax =   <&ads7846>,"ti,x-max;0";
		ymax =   <&ads7846>,"ti,y-max;0";
		pmin =   <&ads7846>,"ti,pressure-min;0";
		pmax =   <&ads7846>,"ti,pressure-max;0";
		xohms =  <&ads7846>,"ti,x-plate-ohms;0";
	};
};