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54 lines
1.7 KiB
54 lines
1.7 KiB
* 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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