On Wed, Dec 30, 2020 at 11:45 AM Adam Ford aford173@gmail.com wrote:
Linux doesn't appear to need it, and no 64-bit imx boards in Linux appear to use them. Some layerscape boards appear to use these flags. If it's not necessary for Linux, but it is necessary for U-Boot, it seems like the -u-boot.dtsi file is the right place to put it. It's consistent with that was done for the imx8mm-evk-u-boot.dtsi and others [1]
IMHO the device trees should be the same for Linux and U-Boot as much as we can.
Of course, it is OK to add custom U-Boot properties, such as u-boot,dm-spl inside -u-boot.dtsi file, but adding MMC related properties only in U-Boot dtsi does not seem correct.
It would be nice if someone could investigate what is missing in the U-Boot sdhc driver to handle these modes by default.