linux-kernel - Re: [PATCH 05/13] arm64: dts: freescale: imx93-phycore-som: Add eMMC no-1-8-v by default

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Message-ID: <Z/fdR2C0IRUfUv4U@lizhi-Precision-Tower-5810>
Date: Thu, 10 Apr 2025 11:01:27 -0400
From: Frank Li <Frank.li@....com>
To: Primoz Fiser <primoz.fiser@...ik.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, upstream@...ts.phytec.de
Subject: Re: [PATCH 05/13] arm64: dts: freescale: imx93-phycore-som: Add eMMC
 no-1-8-v by default

On Thu, Apr 10, 2025 at 11:02:43AM +0200, Primoz Fiser wrote:
> Add property 'no-1-8-v' by default to usdhc1 (eMMC) node. Bootloader
> will take care of deleting the property in case SOM supports HS400 mode
> (1.8V IO voltage feature flag has to be set in the EEPROM).

what means of EEPROM here?

Generally eMMC worked fixed voltage, why need 'no-1-8-v' here, even no
HS400 support.

Frank
>
> Signed-off-by: Primoz Fiser <primoz.fiser@...ik.com>
> ---
>  arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
> index 3d84eed33074..d6589d26c875 100644
> --- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
> @@ -172,6 +172,7 @@ &usdhc1 {
>  	pinctrl-2 = <&pinctrl_usdhc1_200mhz>;
>  	bus-width = <8>;
>  	non-removable;
> +	no-1-8-v;
>  	status = "okay";
>  };
>
> --
> 2.34.1
>