linux-kernel - [PATCH v2 2/2] arm64: dts: add off-on-delay-us for usdhc2 regulator

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Message-Id: <20251119-dts-imx8qm-v2-2-2579434f95cb@nxp.com>
Date: Wed, 19 Nov 2025 11:22:40 +0800
From: Haibo Chen <haibo.chen@....com>
To: 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>, 
 Frank Li <Frank.Li@....com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Haibo Chen <haibo.chen@....com>
Subject: [PATCH v2 2/2] arm64: dts: add off-on-delay-us for usdhc2
 regulator

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")
Reviewed-by: Frank Li <Frank.Li@....com>
Signed-off-by: Haibo Chen <haibo.chen@....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