linux-kernel - [PATCH v4 4/4] arm64: dts: rk3399-pinephone-pro: Fix voltage threshold for volume keys

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Message-Id: <20250929-ppp_light_accel_mag_vol-down-v4-4-6598f22d3451@gmail.com>
Date: Mon, 29 Sep 2025 00:35:15 -0700
From: Rudraksha Gupta via B4 Relay <devnull+guptarud.gmail.com@...nel.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: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Rudraksha Gupta <guptarud@...il.com>, Ondrej Jirman <megi@....cz>
Subject: [PATCH v4 4/4] arm64: dts: rk3399-pinephone-pro: Fix voltage
 threshold for volume keys

From: Ondrej Jirman <megi@....cz>

Previously sometimes pressing the volume-down button would register as
a volume-up button. Match the thresholds as shown in the Pinephone Pro
schematic.

Tests:

~ $ evtest
    // Mashed the volume down ~100 times with varying intensity
    Event: time xxx, type 1 (EV_KEY), code 114 (KEY_VOLUMEDOWN), value 1
    Event: time xxx, type 1 (EV_KEY), code 114 (KEY_VOLUMEDOWN), value 0
    // Mashed the volume up ~100 times with varying intensity
    Event: time xxx, type 1 (EV_KEY), code 115 (KEY_VOLUMEUP), value 1
    Event: time xxx, type 1 (EV_KEY), code 115 (KEY_VOLUMEUP), value 0

Signed-off-by: Ondrej Jirman <megi@....cz>
Signed-off-by: Rudraksha Gupta <guptarud@...il.com>
---
 arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
index 05aaf152b5efa5a87663fc97ce034e75131670bb..e7b0d965df6f5daa3e1b7ff98d567b74e8c7715f 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
@@ -40,13 +40,13 @@ adc-keys {
 		button-up {
 			label = "Volume Up";
 			linux,code = <KEY_VOLUMEUP>;
-			press-threshold-microvolt = <100000>;
+			press-threshold-microvolt = <2000>;
 		};
 
 		button-down {
 			label = "Volume Down";
 			linux,code = <KEY_VOLUMEDOWN>;
-			press-threshold-microvolt = <600000>;
+			press-threshold-microvolt = <300000>;
 		};
 	};
 

-- 
2.51.0