linux-kernel - [PATCH RFC v2 2/6] arm64: dts: qcom: sdm845-tama: Add Synaptics Touchscreen

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Date:   Mon, 13 Mar 2023 17:32:37 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: [PATCH RFC v2 2/6] arm64: dts: qcom: sdm845-tama: Add Synaptics
 Touchscreen

From: Konrad Dybcio <konrad.dybcio@...ainline.org>

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>
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 .../dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts  |  3 +
 .../boot/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 81cbf535cb76..5d2052a0ff69 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 ac0dfb383892..967c9b81f061 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama.dtsi
@@ -405,10 +405,43 @@ &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 {
@@ -561,6 +594,38 @@ sde_te_active_sleep: sde-te-active-sleep-state {
 		drive-strength = <2>;
 		bias-pull-down;
 	};
+
+	ts_default: ts-default-state {
+		reset-pins {
+			pins = "gpio99";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-up;
+		};
+
+		int-pins {
+			pins = "gpio125";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-up;
+		};
+	};
+
+	ts_sleep: ts-sleep-state {
+		reset-pins {
+			pins = "gpio99";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-down;
+		};
+
+		int-pins {
+			pins = "gpio125";
+			function = "gpio";
+			drive-strength = <2>;
+			bias-pull-down;
+		};
+	};
 };
 
 &uart6 {

-- 
2.39.2