使用设备树属性启用 eMMC

&sdhc_1 {
status = "okay";
pinctrl-names = "default", "sleep";
pinctrl-0 = <&sdc1_on>;
pinctrl-1 = <&sdc1_off>;
vmmc-supply = <&vreg_l19a_2p9>;
vqmmc-supply = <&vreg_l12a_1p8>;
};