Enable eMMC using device tree properties - Qualcomm Dragonwing Documentation

To enable eMMC, add the following lines in the &sdhc_1 node in the SoC-specific DTSI file.

&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>;
};

Update the following files as per the SoC device tree path /kernel_platform/kernel/arch/arm64/boot/dts/qcom/:

qcs6490-addons-rb3gen2.dts
qcs6490-rb3gen2.dts
qcs6490-addons-rb3gen2.dtsi
qcs6490-addons-rb3gen2-ia-mezz.dts
qcs6490-addons-rb3gen2-ptz-mezz.dts
qcs6490-addons-rb3gen2-video-mezz.dts
qcs6490-addons-rb3gen2-vision-mezz.dts
qcs6490-addons-rb3gen2-vision-mezz-hsp.dts

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