[PATCH v4 5/5] arm64: dts: rockchip: Enable SD-card interface on Radxa E20C

[Jonas Karlman]

On 2025-04-17 16:40, Yao Zi wrote:
> SD-card is available on Radxa E20C board.
> 
> Signed-off-by: Yao Zi <ziyao at disroot.org>

SD-card is detected and working on my E20C, and this also seem to match
the schematics for E20C:

  mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
  mmc_host mmc1: Bus speed (slot 0) = 148500000Hz (slot req 150000000Hz, actual 148500000HZ div = 0)
  dwmmc_rockchip ffc30000.mmc: Successfully tuned phase to 215
  mmc1: new UHS-I speed SDR104 SDHC card at address 59b4
  mmcblk1: mmc1:59b4 USD00 29.5 GiB
   mmcblk1: p1

  $ cat /sys/kernel/debug/mmc1/ios
  lock:           150000000 Hz
  actual clock:   148500000 Hz
  vdd:            21 (3.3 ~ 3.4 V)
  bus mode:       2 (push-pull)
  chip select:    0 (don't care)
  power mode:     2 (on)
  bus width:      2 (4 bits)
  timing spec:    6 (sd uhs SDR104)
  signal voltage: 1 (1.80 V)
  driver type:    0 (driver type B)

So this is:

Reviewed-by: Jonas Karlman <jonas at kwiboo.se>

Regards,
Jonas

> ---
>  .../boot/dts/rockchip/rk3528-radxa-e20c.dts   | 30 +++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
> index 57a446b5cbd6..09d917a0acc5 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
> @@ -17,6 +17,7 @@ / {
>  
>  	aliases {
>  		mmc0 = &sdhci;
> +		mmc1 = &sdmmc;
>  	};
>  
>  	chosen {
> @@ -108,6 +109,18 @@ vcc5v0_sys: regulator-5v0-vcc-sys {
>  		regulator-min-microvolt = <5000000>;
>  		regulator-max-microvolt = <5000000>;
>  	};
> +
> +	vccio_sd: regulator-vccio-sd {
> +		compatible = "regulator-gpio";
> +		gpios = <&gpio4 RK_PB6 GPIO_ACTIVE_HIGH>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&sdmmc_vol_ctrl_h>;
> +		regulator-name = "vccio_sd";
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <3300000>;
> +		states = <1800000 0x0>, <3300000 0x1>;
> +		vin-supply = <&vcc5v0_sys>;
> +	};
>  };
>  
>  &pinctrl {
> @@ -130,6 +143,12 @@ wan_led_g: wan-led-g {
>  			rockchip,pins = <4 RK_PC0 RK_FUNC_GPIO &pcfg_pull_none>;
>  		};
>  	};
> +
> +	sdmmc {
> +		sdmmc_vol_ctrl_h: sdmmc-vol-ctrl-h {
> +			rockchip,pins = <4 RK_PB6 RK_FUNC_GPIO &pcfg_pull_none>;
> +		};
> +	};
>  };
>  
>  &saradc {
> @@ -148,6 +167,17 @@ &sdhci {
>  	status = "okay";
>  };
>  
> +&sdmmc {
> +	bus-width = <4>;
> +	cap-mmc-highspeed;
> +	cap-sd-highspeed;
> +	disable-wp;
> +	sd-uhs-sdr104;
> +	vmmc-supply = <&vcc_3v3>;
> +	vqmmc-supply = <&vccio_sd>;
> +	status = "okay";
> +};
> +
>  &uart0 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&uart0m0_xfer>;