linux-kernel - Re: [PATCH v3 8/8] ARM: dts: microchip: sama5d2_xplained: Add power-supply property for sdmmc0 node

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Message-ID: <c40ecf74-1367-401b-80f5-7277c7a7f1ee@tuxon.dev>
Date: Sun, 18 Feb 2024 16:46:08 +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 8/8] ARM: dts: microchip: sama5d2_xplained: Add
 power-supply property for sdmmc0 node



On 06.02.2024 14:03, Mihai Sain wrote:
> The sdmmc0 controller is powered from 3.3V regulator.

Same here according to
https://ww1.microchip.com/downloads/en/DeviceDoc/SAMA5D2C-XULT-User%27s-Guide-50002691E.pdf

> Add vmmc-supply and vqmmc-supply properties to sdmmc0 node.
> 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-sama5d2_xplained.dts | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/microchip/at91-sama5d2_xplained.dts b/arch/arm/boot/dts/microchip/at91-sama5d2_xplained.dts
> index 6680031387e8..9b7e56790a5a 100644
> --- a/arch/arm/boot/dts/microchip/at91-sama5d2_xplained.dts
> +++ b/arch/arm/boot/dts/microchip/at91-sama5d2_xplained.dts
> @@ -67,6 +67,8 @@ sdmmc0: sdio-host@...00000 {
>  			pinctrl-0 = <&pinctrl_sdmmc0_default>;
>  			non-removable;
>  			mmc-ddr-3_3v;
> +			vmmc-supply = <&vdd_3v3_reg>;
> +			vqmmc-supply = <&vdd_3v3_reg>;
>  			status = "okay";
>  		};
>