linux-kernel - [PATCH 2/8] arm64: dts: qcom: sdm845-tama: Add Synaptics Touchscreen

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Message-Id: <20220930191049.123256-3-konrad.dybcio@somainline.org>
Date:   Fri, 30 Sep 2022 21:10:43 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     ~postmarketos/upstreaming@...ts.sr.ht
Cc:     martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/8] arm64: dts: qcom: sdm845-tama: Add Synaptics Touchscreen

Add required pins and RMI4 node to the common DT and remove it
from Akatsuki, as it uses a different touch.

Since the panels are super high tech proprietary incell, they
need to be handled with very precise timings. As such the panel
driver sets up the power rails and GPIOs and the touchscreen
driver *has to* probe afterwards.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
---
 .../qcom/sdm845-sony-xperia-tama-akatsuki.dts |  3 +
 .../dts/qcom/sdm845-sony-xperia-tama.dtsi     | 69 ++++++++++++++++++-
 2 files changed, 70 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
index 2a16305ac5da..5c5949a51184 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
@@ -7,6 +7,9 @@
 
 #include "sdm845-sony-xperia-tama.dtsi"
 
+/* XZ3 uses an Atmel touchscreen instead. */
+/delete-node/ &touchscreen;
+
 / {
 	model = "Sony Xperia XZ3";
 	compatible = "sony,akatsuki-row", "qcom,sdm845";
diff --git a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama.dtsi b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama.dtsi
index ac8eb59ed010..809a6d7e739b 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama.dtsi
@@ -375,10 +375,43 @@ &gcc {
 };
 
 &i2c5 {
-	status = "okay";
 	clock-frequency = <400000>;
+	status = "okay";
+
+	touchscreen: touchscreen@2c {
+		compatible = "syna,rmi4-i2c";
+		reg = <0x2c>;
+
+		interrupt-parent = <&tlmm>;
+		interrupts = <125 IRQ_TYPE_EDGE_FALLING>;
+		vdd-supply = <&vreg_l14a_1p8>;
+		/*
+		 * This is a blatant abuse of OF, but the panel driver *needs*
+		 * to probe first, as the power/gpio switching needs to be precisely
+		 * timed in order for both the display and touch panel to function properly.
+		 */
+		incell-supply = <&panel>;
+
+		syna,reset-delay-ms = <220>;
+		syna,startup-delay-ms = <1000>;
+
+		pinctrl-names = "default", "sleep";
+		pinctrl-0 = <&ts_default>;
+		pinctrl-1 = <&ts_sleep>;
 
-	/* Synaptics touchscreen @ 2c, 3c */
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		rmi4-f01@1 {
+			reg = <0x01>;
+			syna,nosleep-mode = <1>;
+		};
+
+		rmi4-f12@12 {
+			reg = <0x12>;
+			syna,sensor-type = <1>;
+		};
+	};
 };
 
 &i2c10 {
@@ -497,6 +530,38 @@ sde_te_active_sleep: sde-te-active-sleep-state {
 		drive-strength = <2>;
 		bias-pull-down;
 	};
+
+	ts_default: ts-default-state {
+		reset-pin {
+			pins = "gpio99";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-up;
+		};
+
+		int-pin {
+			pins = "gpio125";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-up;
+		};
+	};
+
+	ts_sleep: ts-sleep-state {
+		reset-pin {
+			pins = "gpio99";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-down;
+		};
+
+		int-pin {
+			pins = "gpio125";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-down;
+		};
+	};
 };
 
 &uart6 {
-- 
2.37.3