Re: [PATCH v3 1/9] arm64: dts: imx8mm-nitrogen-r2: add wifi/bt chip

[Krzysztof Kozlowski <krzk@kernel.org>]

On Fri, Feb 19, 2021 at 03:30:20PM +0100, Adrien Grassein wrote:
> Add usdhc3 description which corresponds to the wifi/bt chip
> 
> Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
> ---
>  .../boot/dts/freescale/imx8mm-nitrogen-r2.dts | 38 +++++++++++++++++++
>  1 file changed, 38 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-nitrogen-r2.dts b/arch/arm64/boot/dts/freescale/imx8mm-nitrogen-r2.dts
> index c0c384d76147..4a3dabeb8c85 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-nitrogen-r2.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-nitrogen-r2.dts
> @@ -9,6 +9,24 @@
>  / {
>  	model = "Boundary Devices i.MX8MMini Nitrogen8MM Rev2";
>  	compatible = "boundary,imx8mm-nitrogen8mm", "fsl,imx8mm";
> +
> +	reg_vref_1v8: regulator-vref-1v8 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "vref-1v8";
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <1800000>;
> +	};
> +
> +	reg_wlan_vmmc: regulator-wlan-vmmc {
> +		compatible = "regulator-fixed";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_reg_wlan_vmmc>;
> +		regulator-name = "reg_wlan_vmmc";
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +		gpio = <&gpio3 20 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +	};
>  };
>  
>  &A53_0 {
> @@ -206,6 +224,20 @@ &usdhc2 {
>  	status = "okay";
>  };
>  
> +/* wlan */
> +&usdhc3 {
> +	bus-width = <4>;
> +	sdhci-caps-mask = <0x2 0x0>;
> +	non-removable;
> +	pinctrl-names = "default", "state_100mhz", "state_200mhz";
> +	pinctrl-0 = <&pinctrl_usdhc3>;
> +	pinctrl-1 = <&pinctrl_usdhc3_100mhz>;
> +	pinctrl-2 = <&pinctrl_usdhc3_200mhz>;
> +	vmmc-supply = <&reg_wlan_vmmc>;
> +	vqmmc-supply = <&reg_vref_1v8>;

You sent v3 before I replied on your comments. I don't think there is
any benefit in fixed-regulator which cannot be controlled. Are you sure
vqmmc (the bus clock, host interface, controller core?) does not go from
the PMIC?

Best regards,
Krzysztof