Documentation/devicetree/bindings/mmc/cavium-mmc.txt

Source file repositories/reference/linux-study-clean/Documentation/devicetree/bindings/mmc/cavium-mmc.txt

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System
Linux kernel
Corpus path
Documentation/devicetree/bindings/mmc/cavium-mmc.txt
Extension
.txt
Size
1569 bytes
Lines
58
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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Annotated Snippet

The highspeed MMC host controller on Caviums SoCs provides an interface
for MMC and SD types of memory cards.

Supported maximum speeds are the ones of the eMMC standard 4.41 as well
as the speed of SD standard 4.0. Only 3.3 Volt is supported.

Required properties:
 - compatible : should be one of:
   cavium,octeon-6130-mmc
   cavium,octeon-7890-mmc
   cavium,thunder-8190-mmc
   cavium,thunder-8390-mmc
   mmc-slot
 - reg : mmc controller base registers
 - clocks : phandle

Optional properties:
 - for cd, bus-width and additional generic mmc parameters
   please refer to mmc.txt within this directory
 - cavium,cmd-clk-skew : number of coprocessor clocks before sampling command
 - cavium,dat-clk-skew : number of coprocessor clocks before sampling data

Deprecated properties:
- spi-max-frequency : use max-frequency instead
- cavium,bus-max-width : use bus-width instead
- power-gpios : use vmmc-supply instead
- cavium,octeon-6130-mmc-slot : use mmc-slot instead

Examples:
	mmc_1_4: mmc@1,4 {
		compatible = "cavium,thunder-8390-mmc";
		reg = <0x0c00 0 0 0 0>;	/* DEVFN = 0x0c (1:4) */
		#address-cells = <1>;
		#size-cells = <0>;
		clocks = <&sclk>;

		mmc-slot@0 {
			compatible = "mmc-slot";
			reg = <0>;
			vmmc-supply = <&mmc_supply_3v3>;
			max-frequency = <42000000>;
			bus-width = <4>;
			cap-sd-highspeed;
		};

		mmc-slot@1 {
			compatible = "mmc-slot";
			reg = <1>;
			vmmc-supply = <&mmc_supply_3v3>;
			max-frequency = <42000000>;
			bus-width = <8>;
			cap-mmc-highspeed;
			non-removable;
		};
	};

Annotation

Implementation Notes