lkml.org 
[lkml]   [2022]   [Oct]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V2 14/15] arm64: dts: imx8m[m, p]-evk: change to use off-on-delay-us in regulator
On 22-10-24, Peng Fan (OSS) wrote:
> From: Haibo Chen <haibo.chen@nxp.com>
>
> 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 <haibo.chen@nxp.com>
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
> arch/arm64/boot/dts/freescale/imx8mm-evk.dts | 2 +-
> arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 1 +
> arch/arm64/boot/dts/freescale/imx8mq-evk.dts | 1 +
> 3 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> index c93387fcd498..898735965ac9 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> @@ -22,7 +22,7 @@ reg_sd1_vmmc: sd1_regulator {
> regulator-min-microvolt = <3300000>;
> regulator-max-microvolt = <3300000>;
> gpio = <&gpio2 10 GPIO_ACTIVE_HIGH>;
> - off-on-delay = <20000>;

I can't find the "off-on-delay" property you're deleting here in
upstream.

> + off-on-delay-us = <20000>;
> startup-delay-us = <100>;
> enable-active-high;
> };
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> index ce450965e837..fdbcd2483efc 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
> @@ -56,6 +56,7 @@ reg_usdhc2_vmmc: regulator-usdhc2 {
> 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 82387b9cb800..07d9fb2aacf8 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
> @@ -46,6 +46,7 @@ reg_usdhc2_vmmc: regulator-vsd-3v3 {
> regulator-min-microvolt = <3300000>;
> regulator-max-microvolt = <3300000>;
> gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
> + off-on-delay-us = <20000>;
> enable-active-high;
> };
>
> --
> 2.37.1
>
>
>

\
 
 \ /
  Last update: 2022-10-28 16:42    [W:0.195 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site