linux-kernel - Re: [PATCH v3 6/8] ARM: dts: microchip: sama5d29_curiosity: Add power-supply properties for sdmmc nodes

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Message-ID: <38ae8cf6-1daf-4c36-8431-95e01fcc906f@tuxon.dev>
Date: Sun, 18 Feb 2024 16:45:58 +0200
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Mihai Sain <mihai.sain@...rochip.com>, 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 v3 6/8] ARM: dts: microchip: sama5d29_curiosity: Add
 power-supply properties for sdmmc nodes



On 06.02.2024 14:03, Mihai Sain wrote:
> The sdmmc0 and sdmmc1 controllers are powered from 3.3V regulator.

Same here (for SDMMC0), according to
https://ww1.microchip.com/downloads/aemDocuments/documents/MPU32/ProductDocuments/UserGuides/SAMA5D29-Curiosity-EV07R15A-Users-Guide-DS60001822.pdf

> Add vmmc-supply and vqmmc-supply properties to sdmmc nodes.
> The sdmmc controller from SAMA5D2 MPU has support for
> IO voltage signaling/switching required by the UHS sd-card.
> In order to avoid the issues from the tuning procedure required by
> the UHS cards, keep the vqmmc at 3V3 to use the sd high-speed mode.
> 
> Signed-off-by: Mihai Sain <mihai.sain@...rochip.com>
> ---
>  arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts
> index 6b02b7bcfd49..4a86597d089a 100644
> --- a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts
> +++ b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts
> @@ -504,6 +504,8 @@ &sdmmc0 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_sdmmc0_default>;
>  	disable-wp;
> +	vmmc-supply = <&vdd_3v3>;
> +	vqmmc-supply = <&vdd_3v3>;
>  	status = "okay";
>  };
>  
> @@ -512,6 +514,8 @@ &sdmmc1 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_sdmmc1_default>;
>  	disable-wp;
> +	vmmc-supply = <&vdd_3v3>;
> +	vqmmc-supply = <&vdd_3v3>;
>  	status = "okay";
>  };
>