| * 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>; |
| }; |
| }; |
