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