From 2a6b56aafb0cb3cd8bbedde4f7e5498acb30fad8 Mon Sep 17 00:00:00 2001 From: Haibo Chen Date: Thu, 17 Nov 2022 17:54:02 +0800 Subject: arm64: dts: imx8m[m,q]-evk: change to use 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: Haibo Chen Signed-off-by: Peng Fan Reviewed-by: Marco Felsch Signed-off-by: Shawn Guo --- arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 1 + arch/arm64/boot/dts/freescale/imx8mq-evk.dts | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi index 6800d923aa7e..3f2b0ad51e18 100644 --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi @@ -56,6 +56,7 @@ regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>; + off-on-delay-us = <20000>; enable-active-high; }; diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts index 2102e9b57697..78937910f403 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts +++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts @@ -46,6 +46,7 @@ regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>; + off-on-delay-us = <20000>; enable-active-high; }; -- cgit