[PATCH 2/2] mmc: fsl_esdhc_imx: add extra delay for IO voltage switch if necessary

Fabio Estevam festevam at gmail.com
Mon Mar 22 13:04:39 CET 2021

Hi Haibo,

On Mon, Mar 22, 2021 at 8:09 AM <haibo.chen at nxp.com> wrote:

> --- a/arch/arm/dts/imx8mm-evk-u-boot.dtsi
> +++ b/arch/arm/dts/imx8mm-evk-u-boot.dtsi
> @@ -102,6 +102,7 @@
>         u-boot,dm-spl;
>         sd-uhs-sdr104;
>         sd-uhs-ddr50;
> +       fsl,signal-voltage-switch-extra-delay-ms = <8>;

How does the Linux kernel deal with that?

I don't see such property in the mainline kernel or in the NXP tree.

I am concerned that we add a U-Boot specific here. Also, the fact that
common code waits 10ms is a driver implementation detail, so not happy
that such information needs to be passed in the U-Boot dts.

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