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riscv: dts: thead: Enable WiFi on Lichee Pi 4A

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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@leak.moe>
Signed-off-by: Drew Fustini <fustini@kernel.org>
This commit is contained in:
MoeLeak 2026-05-08 19:44:14 +08:00 committed by Drew Fustini
parent 2f60e35163
commit a20241c083
1 changed files with 47 additions and 0 deletions
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47
arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
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@ -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@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";
};