linux-kernel - [PATCH] arm64: dts: rockchip: Add maskrom button to R5S + R5C

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Message-ID: <20250716083355.327451-1-didi.debian@cknow.org>
Date: Wed, 16 Jul 2025 10:33:35 +0200
From: Diederik de Haas <didi.debian@...ow.org>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>
Cc: Dragan Simic <dsimic@...jaro.org>,
	Johan Jonker <jbx6244@...il.com>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Diederik de Haas <didi.debian@...ow.org>
Subject: [PATCH] arm64: dts: rockchip: Add maskrom button to R5S + R5C

Both the R5S and R5C have a MASKROM button connected via saradc.
For both the R5S as the R5C it's described on page 9 of their
respective schematic, identified as 'Recovery'.

Signed-off-by: Diederik de Haas <didi.debian@...ow.org>
---
 .../arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dtsi b/arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dtsi
index f4d042bdd328..e3f44ea4eabe 100644
--- a/arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3568-nanopi-r5s.dtsi
@@ -25,6 +25,20 @@ chosen: chosen {
 		stdout-path = "serial2:1500000n8";
 	};
 
+	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>;
+		};
+	};
+
 	hdmi-con {
 		compatible = "hdmi-connector";
 		type = "a";
-- 
2.50.0