From 15d32aaf6300b832814a9930fdbd20efdbc9adcf Mon Sep 17 00:00:00 2001
From: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Date: Tue, 14 Jul 2026 15:45:15 +0800
Subject: [PATCH] riscv: dts: thead: Add remaining Lichee Pi 4A IO expansions

Lichee Pi 4A has 3 I2C IO expansion chips onboard, connected to the
I2C0/1/3 busses. The I2C1 one is already added to the device tree, but
the I2C0/3 ones are not yet added.

Add device tree nodes for them.

Link: https://lore.kernel.org/r/20260714074515.1959352-6-zhengxingda@iscas.ac.cn
Reviewed-by: Drew Fustini <fustini@kernel.org>
Signed-off-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
[Icenowy: added commit description, enable SoC pull-up, remove I2C1 and
 aliases]
Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Signed-off-by: Drew Fustini <fustini@kernel.org>
---
 .../boot/dts/thead/th1520-lichee-pi-4a.dts    | 63 +++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts b/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
index 5523957430ea..1eb575aa9a74 100644
--- a/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
+++ b/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
@@ -117,6 +117,23 @@ hdmi_out_con: endpoint {
 	};
 };
 
+&i2c0 {
+	clock-frequency = <400000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c0_pins>;
+	status = "okay";
+
+	ioexp1: gpio@18 {
+		compatible = "nxp,pca9557";
+		reg = <0x18>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "cam0_dvdd12",
+				  "cam0_avdd28",
+				  "cam0_dovdd18";
+	};
+};
+
 &i2c1 {
 	clock-frequency = <400000>;
 	pinctrl-names = "default";
@@ -139,6 +156,28 @@ ioexp2: gpio@18 {
 	};
 };
 
+&i2c3 {
+	clock-frequency = <400000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c3_pins>;
+	status = "okay";
+
+	ioexp3: gpio@18 {
+		compatible = "nxp,pca9557";
+		reg = <0x18>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "tp0_rst",
+				  "",
+				  "",
+				  "vcc5v_usb",
+				  "vdd28_tp0",
+				  "vdd33_lcd0",
+				  "vdd18_lcd0",
+				  "lcd0_reset";
+	};
+};
+
 &padctrl0_apsys {
 	fan_pins: fan-0 {
 		pwm1-pins {
@@ -152,6 +191,18 @@ pwm1-pins {
 		};
 	};
 
+	i2c3_pins: i2c3-0 {
+		i2c-pins {
+			pins = "I2C3_SCL", "I2C3_SDA";
+			function = "i2c";
+			bias-pull-up = <2100>;
+			drive-strength = <7>;
+			input-enable;
+			input-schmitt-enable;
+			slew-rate = <0>;
+		};
+	};
+
 	uart0_pins: uart0-0 {
 		tx-pins {
 			pins = "UART0_TXD";
@@ -176,6 +227,18 @@ rx-pins {
 };
 
 &padctrl1_apsys {
+	i2c0_pins: i2c0-0 {
+		i2c-pins {
+			pins = "I2C0_SCL", "I2C0_SDA";
+			function = "i2c";
+			bias-pull-up = <2100>;
+			drive-strength = <7>;
+			input-enable;
+			input-schmitt-enable;
+			slew-rate = <0>;
+		};
+	};
+
 	i2c1_pins: i2c1-0 {
 		i2c-pins {
 			pins = "I2C1_SCL", "I2C1_SDA";