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Am335x 内核SD卡驱动移植

AM335x的自定义板子,基于

dts中配置:

&mmc1 {
status = "okay";
vmmc-supply = <&vmmc_reg>;
bus-width = <4>;
pinctrl-names = "default", "sleep";
pinctrl-0 = <&mmc1_pins_default>;
pinctrl-1 = <&mmc1_pins_sleep>;
cd-gpios = <&gpio0 6 GPIO_ACTIVE_HIGH>;
};

vmmc_reg: regulator@12 {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
regulator-always-on;
};

内核启动过程中,报错 unable to get vmmc regulator -517

以上设备树配置哪里有问题吗?