linux-kernel - Re: [PATCH 2/2] arm64: dts: add off-on-delay-us for usdhc2 regulator

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Message-ID: <aRyR4MSk50BMSrFM@lizhi-Precision-Tower-5810>
Date: Tue, 18 Nov 2025 10:33:52 -0500
From: Frank Li <Frank.li@....com>
To: Haibo Chen <haibo.chen@....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>,
	Dong Aisheng <aisheng.dong@....com>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: add off-on-delay-us for usdhc2 regulator

On Tue, Nov 18, 2025 at 04:30:18PM +0800, Haibo Chen wrote:
> For SD card, according to the spec requirement, for sd card power reset
> operation, it need sd card supply voltage to be lower than 0.5v and keep
> over 1ms, otherwise, next time power back the sd card supply voltage to
> 3.3v, sd card can't support SD3.0 mode again.
>
> To match such requirement on imx8qm-mek board, add 4.8ms delay between
> sd power off and power on.
>
> Fixes: 307fd14d4b14 ("arm64: dts: imx: add imx8qm mek support")
> Signed-off-by: Haibo Chen <haibo.chen@....com>

Reviewed-by: Frank Li <Frank.Li@....com>

> ---
>  arch/arm64/boot/dts/freescale/imx8qm-mek.dts | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8qm-mek.dts b/arch/arm64/boot/dts/freescale/imx8qm-mek.dts
> index 667ba2fea8678215c611dc0ca19e8fbc397f9273..f1b0563d3a09044dda30627a62de5707b53f021a 100644
> --- a/arch/arm64/boot/dts/freescale/imx8qm-mek.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8qm-mek.dts
> @@ -263,6 +263,7 @@ reg_usdhc2_vmmc: usdhc2-vmmc {
>  		regulator-max-microvolt = <3000000>;
>  		gpio = <&lsio_gpio4 7 GPIO_ACTIVE_HIGH>;
>  		enable-active-high;
> +		off-on-delay-us = <4800>;
>  	};
>
>  	reg_audio: regulator-audio {
>
> --
> 2.34.1
>