linux-kernel - [PATCH] arm64: dts: mediatek: mt8186-tentacruel: Fix touchscreen model

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Message-ID: <20250812090135.3310374-1-wenst@chromium.org>
Date: Tue, 12 Aug 2025 17:01:34 +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>,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: [PATCH] arm64: dts: mediatek: mt8186-tentacruel: Fix touchscreen model

The touchscreen controller used with the original Krabby design is the
Elan eKTH6918, which is in the same family as eKTH6915, but supporting
a larger screen size with more sense lines.

OTOH, the touchscreen controller that actually shipped on the Tentacruel
devices is the Elan eKTH6A12NAY. A compatible string was added for it
specifically because it has different power sequencing timings.

Fix up the touchscreen nodes for both these. This also includes adding
a previously missing reset line. Also add "no-reset-on-power-off" since
the power is always on, and putting it in reset would consume more
power.

Fixes: 8855d01fb81f ("arm64: dts: mediatek: Add MT8186 Krabby platform based Tentacruel / Tentacool")
Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 arch/arm64/boot/dts/mediatek/mt8186-corsola-krabby.dtsi   | 8 ++++----
 .../dts/mediatek/mt8186-corsola-tentacruel-sku262144.dts  | 4 ++++
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola-krabby.dtsi b/arch/arm64/boot/dts/mediatek/mt8186-corsola-krabby.dtsi
index 7c971198fa95..72a2a2bff0a9 100644
--- a/arch/arm64/boot/dts/mediatek/mt8186-corsola-krabby.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola-krabby.dtsi
@@ -71,14 +71,14 @@ &i2c1 {
 	i2c-scl-internal-delay-ns = <10000>;
 
 	touchscreen: touchscreen@10 {
-		compatible = "hid-over-i2c";
+		compatible = "elan,ekth6915";
 		reg = <0x10>;
 		interrupts-extended = <&pio 12 IRQ_TYPE_LEVEL_LOW>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&touchscreen_pins>;
-		post-power-on-delay-ms = <10>;
-		hid-descr-addr = <0x0001>;
-		vdd-supply = <&pp3300_s3>;
+		reset-gpios = <&pio 60 GPIO_ACTIVE_LOW>;
+		vcc33-supply = <&pp3300_s3>;
+		no-reset-on-power-off;
 	};
 };
 
diff --git a/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku262144.dts b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku262144.dts
index 26d3451a5e47..24d9ede63eaa 100644
--- a/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku262144.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8186-corsola-tentacruel-sku262144.dts
@@ -42,3 +42,7 @@ MATRIX_KEY(0x00, 0x04, KEY_VOLUMEUP)
 		CROS_STD_MAIN_KEYMAP
 	>;
 };
+
+&touchscreen {
+	compatible = "elan,ekth6a12nay";
+};
-- 
2.51.0.rc0.215.g125493bb4a-goog