[PATCH v2] arm64: dts: rockchip: Enable Wi-Fi on the NanoPi M5

[Leonard Lausen]

The NanoPi M5 has an M.2 E-key slot for SDIO Wi-Fi modules such as the
RTL8822CS-based AC200. The SDIO controller is disabled and the module's
power sequence is not described, preventing the card from enumerating.

Enable the controller in four-bit SDR104 mode and connect its 3.3 V card
and 1.8 V I/O supplies. Describe the active-low reset on GPIO1_C2, the
200 ms power-on delay used by the vendor device tree, and the external
32.768 kHz clock from the HYM8563 RTC. Keep the card powered during
suspend as required by the rtw88 SDIO driver.

The SDIO wiring and reset timing are based on FriendlyElec's NanoPi M5
vendor device tree by jensen <jensenhuang@xxxxxxxxxxxxxxx>.

Link: https://github.com/friendlyarm/kernel-rockchip/commit/6f07f3e0b7ec54be90ae30f097d2a9d5aea80974
Assisted-by: LLM
Signed-off-by: Leonard Lausen <leonard@xxxxxxxxx>
---
Hi Shawn,

> disable-wp is for sd cards, please drop it.

Thank you. Dropped it from the SDIO controller in v2.
This was mistakenly copied from vendor source.

Changes in v2:
- Drop disable-wp from the SDIO controller (Shawn Lin).
- Credit the original vendor source and document AI assistance.

AI assistance was used to inspect the vendor DTS and schematics, draft
the DTS changes and commit message, and run build/style checks.

 .../boot/dts/rockchip/rk3576-nanopi-m5.dts    | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-nanopi-m5.dts b/arch/arm64/boot/dts/rockchip/rk3576-nanopi-m5.dts
index 3a305408fa16c..baf1dea2cfa98 100644
--- a/arch/arm64/boot/dts/rockchip/rk3576-nanopi-m5.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-nanopi-m5.dts
@@ -23,6 +23,7 @@ aliases {
 		ethernet0 = &gmac0;
 		ethernet1 = &gmac1;
 		mmc0 = &sdmmc;
+		mmc1 = &sdio;
 	};
 
 	chosen {
@@ -212,6 +213,16 @@ vcc_3v3_s0: regulator-vcc-3v3-s0 {
 		vin-supply = <&vcc_3v3_s3>;
 	};
 
+	sdio_pwrseq: sdio-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		clocks = <&hym8563>;
+		clock-names = "ext_clock";
+		pinctrl-0 = <&wifi_reg_on_h>;
+		pinctrl-names = "default";
+		post-power-on-delay-ms = <200>;
+		reset-gpios = <&gpio1 RK_PC2 GPIO_ACTIVE_LOW>;
+	};
+
 	sound {
 		compatible = "simple-audio-card";
 		pinctrl-names = "default";
@@ -855,6 +866,12 @@ pcie0_perstn: pcie0-perstn {
 		};
 	};
 
+	sdio-pwrseq {
+		wifi_reg_on_h: wifi-reg-on-h {
+			rockchip,pins = <1 RK_PC2 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	sdmmc {
 		sdmmc0_pwren_h: sdmmc0-pwren-h {
 			rockchip,pins = <0 RK_PB6 RK_FUNC_GPIO &pcfg_pull_up>;
@@ -890,6 +907,22 @@ &saradc {
 	status = "okay";
 };
 
+&sdio {
+	bus-width = <4>;
+	cap-sd-highspeed;
+	cap-sdio-irq;
+	keep-power-in-suspend;
+	mmc-pwrseq = <&sdio_pwrseq>;
+	no-mmc;
+	no-sd;
+	non-removable;
+	sd-uhs-sdr104;
+	vmmc-supply = <&vcc_3v3_s3>;
+	vqmmc-supply = <&vcc_1v8_s3>;
+
+	status = "okay";
+};
+
 &sdmmc {
 	bus-width = <4>;
 	cap-sd-highspeed;

base-commit: ae965b9856f033145e292b0c29082a26bcc45efd
-- 
2.47.3