I have a i.MX6Q custom board, and it supports switching to 1.8v for SDIO.
When I worked with u-boot_200908(LTIB version), I can enable the UHS mode
for SD card by setting port_supports_uhs18v filed of struct fsl_esdhc_cfg to 1.
But now I am working with u-boot_201304(Yocto Version), and in this version,
the struct fsl_esdhc_cfg does not have port_supports_uhs18v filed.So I donnot
know how to enable UHS mode for SD card in u-boot_201304.
Could you help me!