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- * Amlogic Meson6, Meson8 and Meson8b SDIO/MMC controller
- The highspeed MMC host controller on Amlogic SoCs provides an interface
- for MMC, SD, SDIO and SDHC types of memory cards.
- Supported maximum speeds are the ones of the eMMC standard 4.41 as well
- as the speed of SD standard 2.0.
- The hardware provides an internal "mux" which allows up to three slots
- to be controlled. Only one slot can be accessed at a time.
- Required properties:
- - compatible : must be one of
- - "amlogic,meson8-sdio"
- - "amlogic,meson8b-sdio"
- along with the generic "amlogic,meson-mx-sdio"
- - reg : mmc controller base registers
- - interrupts : mmc controller interrupt
- - #address-cells : must be 1
- - size-cells : must be 0
- - clocks : phandle to clock providers
- - clock-names : must contain "core" and "clkin"
- Required child nodes:
- A node for each slot provided by the MMC controller is required.
- NOTE: due to a driver limitation currently only one slot (= child node)
- is supported!
- Required properties on each child node (= slot):
- - compatible : must be "mmc-slot" (see mmc.txt within this directory)
- - reg : the slot (or "port") ID
- Optional properties on each child node (= slot):
- - bus-width : must be 1 or 4 (8-bit bus is not supported)
- - for cd and all other additional generic mmc parameters
- please refer to mmc.txt within this directory
- Examples:
- mmc@c1108c20 {
- compatible = "amlogic,meson8-sdio", "amlogic,meson-mx-sdio";
- reg = <0xc1108c20 0x20>;
- interrupts = <0 28 1>;
- #address-cells = <1>;
- #size-cells = <0>;
- clocks = <&clkc CLKID_SDIO>, <&clkc CLKID_CLK81>;
- clock-names = "core", "clkin";
- slot@1 {
- compatible = "mmc-slot";
- reg = <1>;
- bus-width = <4>;
- };
- };
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