[PATCH v3 2/2] arm64: dts: allwinner: h616: orangepi-zero2w: add SDIO WiFi/BT (AW859A)

[Vladimir <anykey196@gmail.com>]

Enable the SDIO bus (mmc1) and power the on-board AW859A (UWE5622)
WiFi/BT combo through an mmc-pwrseq-simple that resets WL_REG_ON (PG18) and
gates the RTC 32 kHz fanout clock (PG10), with the 3.3 V and 1.8 V supplies.

The pwrseq clock must be named "ext_clock" (what mmc-pwrseq-simple requests)
and its output pin must be muxed to the clock function, as done for the other
H616/H618 boards.

Tested on: OrangePi Zero 2W (Allwinner H618) with the out-of-tree uwe5622 driver.

Signed-off-by: Vladimir <anykey196@gmail.com>
---
 .../allwinner/sun50i-h618-orangepi-zero2w.dts | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h618-orangepi-zero2w.dts b/arch/arm64/boot/dts/allwinner/sun50i-h618-orangepi-zero2w.dts
index ff9b40352a5..39f580af15b 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h618-orangepi-zero2w.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h618-orangepi-zero2w.dts
@@ -189,3 +189,45 @@ &usbphy {
 	usb1_vbus-supply = <&reg_vcc5v>;
 	status = "okay";
 };
+
+/ {
+	reg_vcc33_wifi: vcc33-wifi {
+		/* Always-on 3.3V regulator for WiFi and BT */
+		compatible = "regulator-fixed";
+		regulator-name = "vcc33-wifi";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-always-on;
+		vin-supply = <&reg_vcc5v>;
+	};
+
+	reg_vcc_wifi_io: vcc-wifi-io {
+		/* Always-on 1.8V regulator for WiFi and BT IO */
+		compatible = "regulator-fixed";
+		regulator-name = "vcc-wifi-io";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-always-on;
+		vin-supply = <&reg_vcc33_wifi>;
+	};
+
+	wifi_pwrseq: wifi-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		clocks = <&rtc CLK_OSC32K_FANOUT>;
+		clock-names = "ext_clock";
+		pinctrl-names = "default";
+		pinctrl-0 = <&x32clk_fanout_pin>;
+		reset-gpios = <&pio 6 18 GPIO_ACTIVE_LOW>;	/* PG18 */
+		post-power-on-delay-ms = <200>;
+	};
+};
+
+&mmc1 {
+	vmmc-supply = <&reg_vcc33_wifi>;
+	vqmmc-supply = <&reg_vcc_wifi_io>;
+	mmc-pwrseq = <&wifi_pwrseq>;
+	bus-width = <4>;
+	non-removable;
+	mmc-ddr-1_8v;
+	status = "okay";
+};
-- 
2.55.0.windows.3