[PATCH v4 4/5] arm64: dts: rockchip: Fix SD card support for RK3576 EVB1

[Shawn Lin]

When runtime suspend is enabled, the associated power domain is powered
off, which resets the registers, including the power control bit. As a result,
the card loses power during runtime suspend. The card should still be able
to process I/O with the help of mmc_blk_mq_rw_recovery(), which is suboptimal.
To address this issue, we must use vmmc-supply with a GPIO based method to
maintain power to the card. Also, add cd-gpios method to make hot-plug work
correctly during idle periods.

Fixes: f135a1a07352 ("arm64: dts: rockchip: Add rk3576 evb1 board")
Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
---

Changes in v3: None
Changes in v2: None

 arch/arm64/boot/dts/rockchip/rk3576-evb1-v10.dts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-evb1-v10.dts b/arch/arm64/boot/dts/rockchip/rk3576-evb1-v10.dts
index 0789733..f5746bc 100644
--- a/arch/arm64/boot/dts/rockchip/rk3576-evb1-v10.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-evb1-v10.dts
@@ -223,6 +223,18 @@
 		vin-supply = <&vcc_3v3_s3>;
 	};
 
+	vcc3v3_sd: regulator-vcc-3v3-sd {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpios = <&gpio0 RK_PB6 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&sdmmc_pwren>;
+		regulator-name = "vcc3v3_sd";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vcc_3v3_s0>;
+	};
+
 	vcc_ufs_s0: regulator-vcc-ufs-s0 {
 		compatible = "regulator-fixed";
 		regulator-name = "vcc_ufs_s0";
@@ -904,6 +916,12 @@
 		};
 	};
 
+	sdmmc {
+		sdmmc_pwren: sdmmc-pwren {
+			rockchip,pins = <0 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	usb {
 		usb_host_pwren: usb-host-pwren {
 			rockchip,pins = <0 RK_PC7 RK_FUNC_GPIO &pcfg_pull_none>;
@@ -958,11 +976,15 @@
 	bus-width = <4>;
 	cap-mmc-highspeed;
 	cap-sd-highspeed;
+	cd-gpios = <&gpio0 RK_PA7 GPIO_ACTIVE_LOW>;
 	disable-wp;
 	max-frequency = <200000000>;
 	no-sdio;
 	no-mmc;
+	pinctrl-names = "default";
+	pinctrl-0 = <&sdmmc0_clk &sdmmc0_cmd &sdmmc0_det &sdmmc0_bus4>;
 	sd-uhs-sdr104;
+	vmmc-supply = <&vcc3v3_sd>;
 	vqmmc-supply = <&vccio_sd_s0>;
 	status = "okay";
 };
-- 
2.7.4