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

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>

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 7cb7d28683bce7b4ea1526e2bc687ce4e8b9fb49..af6f25ebbf607113a90c685148b5c2439d4f1f44 100644 (file)
--- 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 @@
                };
        };
 
+       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 @@
 
 };
 
+&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 @@
        };
 };
 
+&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";
 };