linux-kernel - Re: [PATCH 1/8] ARM: dts: microchip: sam9x60_curiosity: Add power-supply properties for sdmmc nodes

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Date: Tue, 23 Jan 2024 09:46:23 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Mihai Sain <mihai.sain@...rochip.com>, claudiu.beznea@...on.dev,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] ARM: dts: microchip: sam9x60_curiosity: Add
 power-supply properties for sdmmc nodes

On 23/01/2024 09:31, Mihai Sain wrote:
> The sdmmc0 and sdmmc1 controllers are powered from 3.3V regulator.
> Add vmmc-supply and vqmmc-supply properties to sdmmc nodes.
> 
> Signed-off-by: Mihai Sain <mihai.sain@...rochip.com>
> ---
>  arch/arm/boot/dts/microchip/at91-sam9x60_curiosity.dts | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/microchip/at91-sam9x60_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sam9x60_curiosity.dts
> index c6fbdd29019f..457c54dde0b7 100644
> --- a/arch/arm/boot/dts/microchip/at91-sam9x60_curiosity.dts
> +++ b/arch/arm/boot/dts/microchip/at91-sam9x60_curiosity.dts
> @@ -452,6 +452,8 @@ &sdmmc0 {
>  	pinctrl-0 = <&pinctrl_sdmmc0_default &pinctrl_sdmmc0_cd>;
>  	cd-gpios = <&pioA 25 GPIO_ACTIVE_LOW>;
>  	disable-wp;
> +	vmmc-supply = <&vdd1_3v3>;
> +	vqmmc-supply = <&vdd1_3v3>;

For this and all other patches:

It is surprising that you use the same supply for both. Looks like
inaccurate description. It is possible, but I think unlikely because
usually VQMMC has lower voltage than 3.3V.

Best regards,
Krzysztof