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Commit 6b6a1867 authored by Neil Armstrong's avatar Neil Armstrong Committed by Kevin Hilman
Browse files

ARM64: dts: meson-gxbb-p200: add ADC laddered keys 



Add the 5 buttons connected to a resistor laddered matrix and sampled
by the SAR ADC channel 0.

Only the p200 board has these buttons, the P201 doesn't.

Signed-off-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: default avatarKevin Hilman <khilman@baylibre.com>
parent bd80ef5e

arch/arm64/boot/dts/amlogic/meson-gxbb-p200.dts

+50 −0
Original line number Diff line number Diff line
@@ -45,10 +45,55 @@ 
/dts-v1/;



#include "meson-gxbb-p20x.dtsi"

#include <dt-bindings/input/input.h>



/ {

	compatible = "amlogic,p200", "amlogic,meson-gxbb";

	model = "Amlogic Meson GXBB P200 Development Board";



	avdd18_usb_adc: regulator-avdd18_usb_adc {

		compatible = "regulator-fixed";

		regulator-name = "AVDD18_USB_ADC";

		regulator-min-microvolt = <1800000>;

		regulator-max-microvolt = <1800000>;

	};



	adc_keys {

		compatible = "adc-keys";

		io-channels = <&saradc 0>;

		io-channel-names = "buttons";

		keyup-threshold-microvolt = <1800000>;



		button-home {

			label = "Home";

			linux,code = <KEY_HOME>;

			press-threshold-microvolt = <900000>; /* 50% */

		};



		button-esc {

			label = "Esc";

			linux,code = <KEY_ESC>;

			press-threshold-microvolt = <684000>; /* 38% */

		};



		button-up {

			label = "Volume Up";

			linux,code = <KEY_VOLUMEUP>;

			press-threshold-microvolt = <468000>; /* 26% */

		};



		button-down {

			label = "Volume Down";

			linux,code = <KEY_VOLUMEDOWN>;

			press-threshold-microvolt = <252000>; /* 14% */

		};



		button-menu {

			label = "Menu";

			linux,code = <KEY_MENU>;

			press-threshold-microvolt = <0>; /* 0% */

		};

	};

};



&i2c_B {
@@ -56,3 +101,8 @@ 
	pinctrl-0 = <&i2c_b_pins>;

	pinctrl-names = "default";

};



&saradc {

	status = "okay";

	vref-supply = <&avdd18_usb_adc>;

};