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I also tested without this delay, SD card can work as SD3.0 on >> imx91 frdm platform. >> >> I prefer to remain this to avoid potential risk as 91evk 93evk 93frdm >> all remain this property. > > I understand that a few NXP boards use this > fsl,signal-voltage-switch-extra-delay-ms property. > > Linux does not use it. U-Boot should not use it either. Whatever > solution the kernel applies to provide this delay, let's use it in > U-Boot. > > I would really appreciate it if you could investigate this with the > NXP folks and try to remove this custom property from U-Boot. > > Let's keep the U-Bot dts files as close as possible with Linux. > > I appreciate your understanding and cooperation. > > Thanks Hi Fabio, I understand your requirement. But as I said, the IO voltage switch only happen on u-boot stage, so it is kind of u-boot specific requirement. So you mean we need to add this delay control into kernel driver, and add this property into kernel dts even kernel stage didn't need to control it? Since we don't have this issue on FRDM-IMX91. How about I remove this property on this commit first. And we can have further discussion on how to resolve this property. Regards, Joseph