arch/arm64/boot/dts/seco/include/baseboard-e81-b79.dtsi

@@ -85,6 +85,16 @@ reg_3v3_aud: 3v3_aud {
 		regulator-always-on;
 	};
 
+	reg_3v3_sdcard: reg_3v3_sdcard {
+		compatible = "regulator-fixed";
+		regulator-name = "3.3V_SDCARD";
+		vin-supply = <&reg_3v3_a>;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&stm32 21 GPIO_ACTIVE_HIGH>;
+		regulator-always-on;
+		enable-active-high;
+	};
 };
 
 &stm32 {
@@ -145,4 +155,8 @@ eeprom: eeprom@57 {
 	};
 };
 
+&sdhc_2 {
+	status = "okay";
+};
+
 #endif

arch/arm64/boot/dts/seco/include/e81-common.dtsi

@@ -432,8 +432,10 @@ vreg_l5c_1v8: ldo5 {
 
 		vreg_l6c_2v96: ldo6 {
 			regulator-name = "VDD_SDIO";
-			regulator-min-microvolt = <2960000>;
-			regulator-max-microvolt = <2960000>;
+			regulator-min-microvolt = <1650000>;
+			//regulator-max-microvolt = <1800000>;
+			//regulator-min-microvolt = <3000000>;
+			regulator-max-microvolt = <3544000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 		};
 
@@ -697,7 +699,19 @@ &sdhc_1 {
 	vmmc-supply = <&vreg_l7b_2p952>;
 	vqmmc-supply = <&vreg_l19b_1p8>;
 
-	status = "okay";
+	status = "disabled";
+};
+
+// uSD
+&sdhc_2 {
+	pinctrl-0 = <&sdc2_clk>, <&sdc2_cmd>, <&sdc2_data>, <&sd_cd_odl>;
+	pinctrl-1 = <&sdc2_clk_sleep>, <&sdc2_cmd_sleep>, <&sdc2_data_sleep>, <&sd_cd_odl>;
+
+	vqmmc-supply = <&vreg_l6c_2v96>;
+	vmmc-supply = <&reg_3v3_sdcard>;
+
+	cd-gpios = <&tlmm 91 GPIO_ACTIVE_LOW>;
+	status = "disabled";
 };
 
 // spi
@@ -1052,6 +1066,24 @@ lcd0_bklt_pwm: lcd0_bklt_pwm {
 	};
 };
 
+&sdc2_clk{
+	pins = "sdc2_clk";
+	drive-strength = <10>;
+	bias-pull-up; /* pull up */
+};
+
+&sdc2_cmd{
+	pins = "sdc2_cmd";
+	drive-strength = <10>;
+	bias-pull-up; /* pull up */
+};
+
+&sdc2_data{
+	pins = "sdc2_data";
+	drive-strength = <10>;
+	bias-pull-up; /* pull up */
+};
+
 &tlmm {
 	// Remove the <48 4> (spi12 pins), which is set in qcm6490.dtsi
 	gpio-reserved-ranges = <32 2>;
@@ -1141,6 +1173,12 @@ config {
 			};
 		};
 	};
+
+	sd_cd_odl: sd-cd-odl-state {
+		pins = "gpio91";
+		function = "gpio";
+		bias-pull-up;
+	};
 };
 
 &tlmm {