From cbc44b22c8a8d9f63390221e84354a2c500f0c85 Mon Sep 17 00:00:00 2001 From: Peng Fan Date: Thu, 17 Nov 2022 17:53:59 +0800 Subject: arm64: dts: imx8mn-evk: set off-on-delay-us in regulator Some SD Card controller and power circuitry has increased capacitance, so the usual toggling of regulator to power the card off and on is insufficient. According to SD spec, for sd card power reset operation, the sd card supply voltage needs 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. This patch add the off-on-delay-us, make sure the sd power reset behavior is align with the specification. Without this patch, when do quick system suspend/resume test, some sd card can't work at SD3.0 mode after system resume back. Signed-off-by: Peng Fan Reviewed-by: Marco Felsch Signed-off-by: Shawn Guo --- arch/arm64/boot/dts/freescale/imx8mn-evk.dtsi | 1 + 1 file changed, 1 insertion(+) (limited to 'arch') diff --git a/arch/arm64/boot/dts/freescale/imx8mn-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-evk.dtsi index 8cb87c7a0f03..e066fa9af834 100644 --- a/arch/arm64/boot/dts/freescale/imx8mn-evk.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mn-evk.dtsi @@ -36,6 +36,7 @@ regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>; + off-on-delay-us = <12000>; enable-active-high; }; -- cgit