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 10:58:12 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: 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 10:07, Mihai.Sain@...rochip.com wrote:
> Hi Krzysztof,
> 
> I'm sorry for quoting (email is sent from Outlook).
> The sdmmc controller from SAM9 MPUs doesn't support the IO voltage signaling/switching required by the UHS sd-card.
> On the electrical schematics of the boards the controller and sd-card power pins are connected to 3V3 regulator.
> On the SAMA5 MPUs there is support for IO voltage switching but since we have issues with the tuning procedure required but the UHS cards,
> we want to keep vqmmc at 3V3 in order to use high-speed mode.

OK, it is fine for me.

Best regards,
Krzysztof