mmci-pl18x 58005000.mmc: no support for card's volts

I have done the same - no STPMIC chip.

You need to declare a fixed voltage power supply in your device tree and use it with the MMC. If you do not do that the MMC driver will not initialize.

You will have to do similar with USB if you plan on using that.

Add to your root node (or where ever suitable}

vmmc: regulator@0 {

compatible = "regulator-fixed";

reg = <0>;

regulator-name = "vmmc";

regulator-min-microvolt = <3300000>;

regulator-max-microvolt = <3300000>;

regulator-always-on;

};

&sdmm1 ( //choose your mmc (1,2,3) here

.....

vmmc-supply = <&vmmc>

.....

}