arm64: dts: rockchip: Add maskrom button to Radxa E20C

Radxa E20C has two buttons, one SARADC maskrom button and one GPIO user
button.

Add support for the maskrom button using a adc-keys node, also add the
regulators used by SARADC controller.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Link: https://lore.kernel.org/r/20250304201642.831218-5-jonas@kwiboo.se
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
[ upstream commit: 3a2819ee9c71d1c6388e456cc4eb042914d15d7e ]

(cherry picked from commit 460ef5b623e5fa69843305faf50f6b1a8e81e1cd)
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

diff --git a/dts/upstream/src/arm64/rockchip/rk3528-radxa-e20c.dts b/dts/upstream/src/arm64/rockchip/rk3528-radxa-e20c.dts
index b378774..5346ef4 100644 (file)
--- a/dts/upstream/src/arm64/rockchip/rk3528-radxa-e20c.dts
+++ b/dts/upstream/src/arm64/rockchip/rk3528-radxa-e20c.dts
@@ -19,6 +19,20 @@
                stdout-path = "serial0:1500000n8";
        };
 
+       adc-keys {
+               compatible = "adc-keys";
+               io-channels = <&saradc 0>;
+               io-channel-names = "buttons";
+               keyup-threshold-microvolt = <1800000>;
+               poll-interval = <100>;
+
+               button-maskrom {
+                       label = "MASKROM";
+                       linux,code = <KEY_SETUP>;
+                       press-threshold-microvolt = <0>;
+               };
+       };
+
        gpio-keys {
                compatible = "gpio-keys";
                pinctrl-names = "default";
@@ -61,6 +75,35 @@
                        linux,default-trigger = "netdev";
                };
        };
+
+       vcc_1v8: regulator-1v8-vcc {
+               compatible = "regulator-fixed";
+               regulator-name = "vcc_1v8";
+               regulator-always-on;
+               regulator-boot-on;
+               regulator-min-microvolt = <1800000>;
+               regulator-max-microvolt = <1800000>;
+               vin-supply = <&vcc_3v3>;
+       };
+
+       vcc_3v3: regulator-3v3-vcc {
+               compatible = "regulator-fixed";
+               regulator-name = "vcc_3v3";
+               regulator-always-on;
+               regulator-boot-on;
+               regulator-min-microvolt = <3300000>;
+               regulator-max-microvolt = <3300000>;
+               vin-supply = <&vcc5v0_sys>;
+       };
+
+       vcc5v0_sys: regulator-5v0-vcc-sys {
+               compatible = "regulator-fixed";
+               regulator-name = "vcc5v0_sys";
+               regulator-always-on;
+               regulator-boot-on;
+               regulator-min-microvolt = <5000000>;
+               regulator-max-microvolt = <5000000>;
+       };
 };
 
 &pinctrl {
@@ -85,6 +128,11 @@
        };
 };
 
+&saradc {
+       vref-supply = <&vcc_1v8>;
+       status = "okay";
+};
+
 &uart0 {
        pinctrl-names = "default";
        pinctrl-0 = <&uart0m0_xfer>;