[PATCH v2 2/2] riscv: dts: thead: Enable WiFi on Lichee Pi 4A

[MoeLeak]

The Lichee Pi 4A has an RTL8723DS WiFi module connected to the TH1520
SDIO1 controller. The module reset line is driven through a PCA9557 GPIO
expander on the I2C1 bus.

Enable I2C1 for the GPIO expander and configure SDIO1 as a non-removable
4-bit SDIO bus using an mmc-pwrseq-simple reset sequence so the WiFi
device can be powered and enumerated.

Signed-off-by: MoeLeak <i at leak.moe>
---
 arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts | 47 +++++++++++++++++++++++
 1 file changed, 47 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 7cb7d28683bc..af6f25ebbf60 100644
--- a/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
+++ b/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
@@ -4,6 +4,7 @@
  */
 
 #include "th1520-lichee-module-4a.dtsi"
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	model = "Sipeed Lichee Pi 4A";
@@ -40,6 +41,12 @@ hdmi_con_in: endpoint {
 		};
 	};
 
+	wifi_pwrseq: wifi-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		reset-gpios = <&ioexp2 4 GPIO_ACTIVE_LOW>;
+		post-power-on-delay-ms = <200>;
+	};
+
 	thermal-zones {
 		cpu-thermal {
 			polling-delay = <1000>;
@@ -96,6 +103,20 @@ fan: pwm-fan {
 
 };
 
+&padctrl1_apsys {
+	i2c1_pins: i2c1-0 {
+		i2c-pins {
+			pins = "I2C1_SCL", "I2C1_SDA";
+			function = "i2c";
+			bias-pull-up = <2100>;
+			drive-strength = <7>;
+			input-enable;
+			input-schmitt-enable;
+			slew-rate = <0>;
+		};
+	};
+};
+
 &padctrl0_apsys {
 	fan_pins: fan-0 {
 		pwm1-pins {
@@ -132,6 +153,32 @@ rx-pins {
 	};
 };
 
+&i2c1 {
+	clock-frequency = <400000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c1_pins>;
+	status = "okay";
+
+	ioexp2: gpio at 18 {
+		compatible = "nxp,pca9557";
+		reg = <0x18>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+};
+
+&sdio1 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	bus-width = <4>;
+	max-frequency = <198000000>;
+	cap-sdio-irq;
+	keep-power-in-suspend;
+	mmc-pwrseq = <&wifi_pwrseq>;
+	non-removable;
+	status = "okay";
+};
+
 &dpu {
 	status = "okay";
 };

-- 
2.53.0