WhyCan Forum(哇酷开发者社区)

=> mmc list
mmc@1c0f000: 0
mmc@1c11000: 1
=> mmc dev 1
CMD_SEND:0
                ARG                      0x00000000
                MMC_RSP_NONE
CMD_SEND:8
                ARG                      0x000001AA
                RET                      -110
CMD_SEND:55
                ARG                      0x00000000
                RET                      -110
CMD_SEND:0
                ARG                      0x00000000
                MMC_RSP_NONE
CMD_SEND:1
                ARG                      0x00000000
                RET                      -110
Card did not respond to voltage select!
=> mmc dev 0
CMD_SEND:0
                ARG                      0x00000000
                MMC_RSP_NONE
CMD_SEND:8
                ARG                      0x000001AA
                RET                      -110
CMD_SEND:55
                ARG                      0x00000000
                RET                      -110
CMD_SEND:0
                ARG                      0x00000000
                MMC_RSP_NONE
CMD_SEND:1
                ARG                      0x00000000
                RET                      -110
Card did not respond to voltage select!

		mmc0: mmc@1c0f000 {
			compatible = "allwinner,sun7i-a20-mmc";
			reg = <0x01c0f000 0x1000>;
			clocks = <&ccu CLK_BUS_MMC0>,
				 <&ccu CLK_MMC0>,
				 <&ccu CLK_MMC0_OUTPUT>,
				 <&ccu CLK_MMC0_SAMPLE>;
			clock-names = "ahb",
				      "mmc",
				      "output",
				      "sample";
			resets = <&ccu RST_BUS_MMC0>;
			reset-names = "ahb";
			interrupts = <GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>;
			status = "disabled";
			#address-cells = <1>;
			#size-cells = <0>;
		};


		mmc2: mmc@1c11000 {
			compatible = "allwinner,sun7i-a20-mmc";
			reg = <0x01c11000 0x1000>;
			clocks = <&ccu CLK_BUS_MMC2>,
				 <&ccu CLK_MMC2>,
				 <&ccu CLK_MMC2_OUTPUT>,
				 <&ccu CLK_MMC2_SAMPLE>;
			clock-names = "ahb",
				      "mmc",
				      "output",
				      "sample";
			resets = <&ccu RST_BUS_MMC2>;
			reset-names = "ahb";
			interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
			status = "disabled";
			#address-cells = <1>;
			#size-cells = <0>;
		};

			mmc2_8bit_pins: mmc2_8bit {
				pins = "PC5", "PC6", "PC8",
				       "PC9", "PC10", "PC11",
				       "PC12", "PC13", "PC14",
				       "PC15", "PC16";
				function = "mmc2";
				drive-strength = <30>;
				bias-pull-up;
			};



&mmc0 {
	pinctrl-names = "default";
	pinctrl-0 = <&mmc0_pins_a>, <&mmc0_cd_pin_sina33>;
	vmmc-supply = <&reg_dcdc1>;
	bus-width = <4>;
	cd-gpios = <&pio 1 4 GPIO_ACTIVE_LOW>; /* PB4 */
	status = "okay";
};

&mmc2 {
	pinctrl-names = "default";
	pinctrl-0 = <&mmc2_8bit_pins>;
	vmmc-supply = <&reg_dcdc1>;
	bus-width = <8>;
	non-removable;
	cap-mmc-hw-reset;
	status = "okay";
};

&mmc2_8bit_pins {
	/* Increase drive strength for DDR modes */
	drive-strength = <40>;
	/* eMMC is missing pull-ups */
	bias-pull-up;
};