linux-kernel - [PATCH v2 2/2] arm64: dts: qcom: sc8280xp-x13s: Fix/enable touchscreen

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Message-ID: <20240126-x13s-touchscreen-v2-2-5374ccc9e10d@quicinc.com>
Date: Fri, 26 Jan 2024 08:41:39 -0800
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jiri Kosina
	<jikos@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-input@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Konrad Dybcio
	<konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>,
        Bjorn Andersson
	<quic_bjorande@...cinc.com>,
        Daniel Thompson <daniel.thompson@...aro.org>
Subject: [PATCH v2 2/2] arm64: dts: qcom: sc8280xp-x13s: Fix/enable
 touchscreen

The failing read-test in __i2c_hid_core_probe() determines that there's
nothing connected at the documented address of the touchscreen.

Introduce the 5ms after-power and 200ms after-reset delays found in the
ACPI tables. Also wire up the reset-gpio, for good measure.

Fixes: 32c231385ed4 ("arm64: dts: qcom: sc8280xp: add Lenovo Thinkpad X13s devicetree")
Tested-by: Daniel Thompson <daniel.thompson@...aro.org>
Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
---
 arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
index def3976bd5bb..33731b95ad51 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
+++ b/arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts
@@ -620,7 +620,6 @@ &i2c4 {
 
 	status = "okay";
 
-	/* FIXME: verify */
 	touchscreen@10 {
 		compatible = "hid-over-i2c";
 		reg = <0x10>;
@@ -630,6 +629,11 @@ touchscreen@10 {
 		vdd-supply = <&vreg_misc_3p3>;
 		vddl-supply = <&vreg_s10b>;
 
+		reset-gpios = <&tlmm 99 GPIO_ACTIVE_LOW>;
+
+		post-power-on-delay-ms = <5>;
+		post-reset-deassert-delay-ms = <200>;
+
 		pinctrl-names = "default";
 		pinctrl-0 = <&ts0_default>;
 	};
@@ -1450,7 +1454,6 @@ int-n-pins {
 		reset-n-pins {
 			pins = "gpio99";
 			function = "gpio";
-			output-high;
 			drive-strength = <16>;
 		};
 	};

-- 
2.25.1