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Tue, 23 Jan 2024 01:58:14 -0800 (PST) Received: from [192.168.1.20] ([178.197.215.66]) by smtp.gmail.com with ESMTPSA id bg23-20020a05600c3c9700b0040d91fa270fsm42202520wmb.36.2024.01.23.01.58.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 Jan 2024 01:58:14 -0800 (PST) Message-ID: <143b8da0-ee76-41a2-a26b-e7513e44e784@linaro.org> Date: Tue, 23 Jan 2024 10:58:12 +0100 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/8] ARM: dts: microchip: sam9x60_curiosity: Add power-supply properties for sdmmc nodes Content-Language: en-US To: Mihai.Sain@microchip.com, claudiu.beznea@tuxon.dev, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, Nicolas.Ferre@microchip.com, alexandre.belloni@bootlin.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20240123083158.7339-1-mihai.sain@microchip.com> <20240123083158.7339-2-mihai.sain@microchip.com> From: Krzysztof Kozlowski Autocrypt: addr=krzysztof.kozlowski@linaro.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 23/01/2024 10:07, Mihai.Sain@microchip.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