ARM: dts: rockchip: add adc-keys node to rk3066a-mk808

The MK808 has a button inside the cover for the boot loader to do
some action. Add the adc-keys node to the rk3066a-mk808.dts file.
The rk3066 has a higher maximum DC supply voltage for the analog part of
SAR-ADC VDDA_SARADC of 2.75V then other Rockchip SoCs.
For the "rockchip,saradc" node is a vref-supply property required,
so add a regulator for it as well.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20210828092755.24560-1-jbx6244@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/arch/arm/boot/dts/rk3066a-mk808.dts b/arch/arm/boot/dts/rk3066a-mk808.dts
index 9790bc63b50a11f4532ad18b34fe95aad8160dfb..667d57a4ff45a5e13b1d3b92e5d2d6f5179e5fd5 100644 (file)
--- a/arch/arm/boot/dts/rk3066a-mk808.dts
+++ b/arch/arm/boot/dts/rk3066a-mk808.dts
@@ -4,6 +4,7 @@
  */
 
 /dts-v1/;
+#include <dt-bindings/input/input.h>
 #include "rk3066a.dtsi"
 
 / {
@@ -24,6 +25,20 @@
                device_type = "memory";
        };
 
+       adc-keys {
+               compatible = "adc-keys";
+               io-channels = <&saradc 1>;
+               io-channel-names = "buttons";
+               keyup-threshold-microvolt = <2500000>;
+               poll-interval = <100>;
+
+               recovery {
+                       label = "recovery";
+                       linux,code = <KEY_VENDOR>;
+                       press-threshold-microvolt = <0>;
+               };
+       };
+
        gpio-leds {
                compatible = "gpio-leds";
 
@@ -46,6 +61,13 @@
                };
        };
 
+       vcc_2v5: vcc-2v5 {
+               compatible = "regulator-fixed";
+               regulator-name = "vcc_2v5";
+               regulator-min-microvolt = <2500000>;
+               regulator-max-microvolt = <2500000>;
+       };
+
        vcc_io: vcc-io {
                compatible = "regulator-fixed";
                regulator-name = "vcc_io";
@@ -164,6 +186,11 @@
        };
 };
 
+&saradc {
+       vref-supply = <&vcc_2v5>;
+       status = "okay";
+};
+
 &uart2 {
        status = "okay";
 };