[PATCH V2] arm64: dts: rockchip: add Hynitron cst340 for Anbernic 353 series

[Chris Morgan <macroalpha82@gmail.com>]

From: Chris Morgan <macromorgan@hotmail.com>

Add support for the Hynitron cst340 touchscreen driver to the Anbernic
RG353P and RG353V devices. Note the RG353VS device does not have a
touchscreen.

https://lore.kernel.org/linux-input/Y1y9e9sgE%2FDck9fB@google.com/

Changes since V1:
 - Removed 'status = "okay";', as it was never disabled.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 .../dts/rockchip/rk3566-anbernic-rg353p.dts   | 19 +++++++++++++++++++
 .../dts/rockchip/rk3566-anbernic-rg353v.dts   | 12 ++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3566-anbernic-rg353p.dts b/arch/arm64/boot/dts/rockchip/rk3566-anbernic-rg353p.dts
index 63cff402f3a8..8aa93c646bec 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-anbernic-rg353p.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3566-anbernic-rg353p.dts
@@ -95,6 +95,18 @@ &i2c2 {
 	pintctrl-names = "default";
 	pinctrl-0 = <&i2c2m1_xfer>;
 	status = "okay";
+
+	touch@1a {
+		compatible = "hynitron,cst340";
+		reg = <0x1a>;
+		interrupt-parent = <&gpio4>;
+		interrupts = <RK_PB1 IRQ_TYPE_EDGE_FALLING>;
+		pinctrl-0 = <&touch_rst>;
+		pinctrl-names = "default";
+		reset-gpios = <&gpio4 RK_PA6 GPIO_ACTIVE_LOW>;
+		touchscreen-size-x = <640>;
+		touchscreen-size-y = <480>;
+	};
 };
 
 &pinctrl {
@@ -104,6 +116,13 @@ spk_amp_enable_h: spk-amp-enable-h {
 				<4 RK_PC2 RK_FUNC_GPIO &pcfg_pull_none>;
 		};
 	};
+
+	touch {
+		touch_rst: touch-rst {
+			rockchip,pins =
+				<4 RK_PA6 RK_FUNC_GPIO &pcfg_pull_up>;
+		};
+	};
 };
 
 &rk817 {
diff --git a/arch/arm64/boot/dts/rockchip/rk3566-anbernic-rg353v.dts b/arch/arm64/boot/dts/rockchip/rk3566-anbernic-rg353v.dts
index 885234a023e1..f49ce29ba597 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-anbernic-rg353v.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3566-anbernic-rg353v.dts
@@ -82,6 +82,18 @@ &i2c2 {
 	pintctrl-names = "default";
 	pinctrl-0 = <&i2c2m1_xfer>;
 	status = "okay";
+
+	touch@1a {
+		compatible = "hynitron,cst340";
+		reg = <0x1a>;
+		interrupt-parent = <&gpio4>;
+		interrupts = <RK_PB1 IRQ_TYPE_EDGE_FALLING>;
+		pinctrl-0 = <&touch_rst>;
+		pinctrl-names = "default";
+		reset-gpios = <&gpio4 RK_PA6 GPIO_ACTIVE_LOW>;
+		touchscreen-size-x = <640>;
+		touchscreen-size-y = <480>;
+	};
 };
 
 &pinctrl {
-- 
2.25.1