ARM: dts: sun7i: Olimex A20-SOM-EVB: Add LRADC keys

The Olimex A20-SOM-EVB is an evaluation board for the Olimex
A20-SOM system-on-module.  It provides a set of android-style
buttons (labeled "VOL+", "VOL-", "MENU", "SEARCH", "HOME", "ESC"
and "ENTER") which are connected to a low-resolution ADC via a
resistor network.

This patch adds appropriate button definitions to the board
dts. The voltages assigned to the keys are specified in the
board schematics published by the manufacturer.

Signed-off-by: Karsten Merker <merker@debian.org>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/arch/arm/boot/dts/sun7i-a20-olimex-som-evb.dts b/arch/arm/boot/dts/sun7i-a20-olimex-som-evb.dts
index a91879ed07f8fcbde4c0ffcfbbab8fb26129ba5d..beccb25e88bf4b6be16014e475b98cb37fc24629 100644 (file)
--- a/arch/arm/boot/dts/sun7i-a20-olimex-som-evb.dts
+++ b/arch/arm/boot/dts/sun7i-a20-olimex-som-evb.dts
@@ -1,5 +1,6 @@
 /*
  * Copyright 2015 - Marcus Cooper <codekipper@gmail.com>
+ * Copyright 2015 - Karsten Merker <merker@debian.org>
  *
  * This file is dual-licensed: you can use it either under the terms
  * of the GPL or the X11 license, at your option. Note that this dual
@@ -45,6 +46,7 @@
 #include "sunxi-common-regulators.dtsi"
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/pinctrl/sun4i-a10.h>
 
@@ -114,6 +116,60 @@
        };
 };
 
+&lradc {
+       vref-supply = <&reg_vcc3v0>;
+       status = "okay";
+
+       button@190 {
+               label = "Volume Up";
+               linux,code = <KEY_VOLUMEUP>;
+               channel = <0>;
+               voltage = <190000>;
+       };
+
+       button@390 {
+               label = "Volume Down";
+               linux,code = <KEY_VOLUMEDOWN>;
+               channel = <0>;
+               voltage = <390000>;
+       };
+
+       button@600 {
+               label = "Menu";
+               linux,code = <KEY_MENU>;
+               channel = <0>;
+               voltage = <600000>;
+       };
+
+       button@800 {
+               label = "Search";
+               linux,code = <KEY_SEARCH>;
+               channel = <0>;
+               voltage = <800000>;
+       };
+
+       button@980 {
+               label = "Home";
+               linux,code = <KEY_HOMEPAGE>;
+               channel = <0>;
+               voltage = <980000>;
+       };
+
+       button@1180 {
+               label = "Esc";
+               linux,code = <KEY_ESC>;
+               channel = <0>;
+               voltage = <1180000>;
+       };
+
+       button@1400 {
+               label = "Enter";
+               linux,code = <KEY_ENTER>;
+               channel = <0>;
+               voltage = <1400000>;
+       };
+};
+
 &mmc0 {
        pinctrl-names = "default";
        pinctrl-0 = <&mmc0_pins_a>, <&mmc0_cd_pin_reference_design>;