root@colibri-imx7-emmc:~# dmesg | grep usdhc
[ 1.507971] sdhci-esdhc-imx: probe of 30b40000.usdhc failed with error -22
[ 1.519825] /soc/aips-bus@30800000/usdhc@30b60000: voltage-ranges unspecified
[ 1.531643] sdhci-esdhc-imx 30b60000.usdhc: Looking up vmmc-supply from device tree
[ 1.531666] sdhci-esdhc-imx 30b60000.usdhc: Looking up vmmc-supply property in node /soc/aips-bus@30800000/usdhc@30bd
[ 1.531692] sdhci-esdhc-imx 30b60000.usdhc: Looking up vqmmc-supply from device tree
[ 1.531705] sdhci-esdhc-imx 30b60000.usdhc: Looking up vqmmc-supply property in node /soc/aips-bus@30800000/usdhc@30d
[ 1.531718] sdhci-esdhc-imx 30b60000.usdhc: No vmmc regulator found
[ 1.542044] sdhci-esdhc-imx 30b60000.usdhc: No vqmmc regulator found
[ 1.590519] mmc0: SDHCI controller on 30b60000.usdhc [30b60000.usdhc] using ADMA