linux-kernel - [PATCH] arm64: dts: mediatek: mt8173-elm-hana: Add vdd-supply to second source trackpad

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Message-ID: <20241008082051.4002438-1-wenst@chromium.org>
Date: Tue,  8 Oct 2024 16:20:49 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
	devicetree@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: mediatek: mt8173-elm-hana: Add vdd-supply to second source trackpad

The Hana device has a second source option trackpad, but it is missing
its regulator supply. It only works because the regulator is marked as
always-on.

Add the regulator supply, and the required post-power-on delay.

Fixes: 689b937bedde ("arm64: dts: mediatek: add mt8173 elm and hana board")
Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi
index 8d1cbc92bce3..e03474702cad 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173-elm-hana.dtsi
@@ -49,6 +49,12 @@ trackpad2: trackpad@2c {
 		interrupts-extended = <&pio 117 IRQ_TYPE_LEVEL_LOW>;
 		reg = <0x2c>;
 		hid-descr-addr = <0x0020>;
+		/*
+		 * The supply is always on. Adding the delay here
+		 * needlessly delays the readiness of the trackpad.
+		 */
+		/* post-power-on-delay-ms = <100>; */
+		vdd-supply = <&mt6397_vgp6_reg>;
 		wakeup-source;
 	};
 };
-- 
2.47.0.rc0.187.ge670bccf7e-goog