Bindings/mmc/amlogic,meson-mx-sdio.txt

   1 * Amlogic Meson6, Meson8 and Meson8b SDIO/MMC controller
   2
   3 The highspeed MMC host controller on Amlogic SoCs provides an interface
   4 for MMC, SD, SDIO and SDHC types of memory cards.
   5
   6 Supported maximum speeds are the ones of the eMMC standard 4.41 as well
   7 as the speed of SD standard 2.0.
   8
   9 The hardware provides an internal "mux" which allows up to three slots
  10 to be controlled. Only one slot can be accessed at a time.
  11
  12 Required properties:
  13  - compatible : must be one of
  14         - "amlogic,meson8-sdio"
  15         - "amlogic,meson8b-sdio"
  16         along with the generic "amlogic,meson-mx-sdio"
  17  - reg : mmc controller base registers
  18  - interrupts : mmc controller interrupt
  19  - #address-cells : must be 1
  20  - size-cells : must be 0
  21  - clocks : phandle to clock providers
  22  - clock-names : must contain "core" and "clkin"
  23
  24 Required child nodes:
  25 A node for each slot provided by the MMC controller is required.
  26 NOTE: due to a driver limitation currently only one slot (= child node)
  27       is supported!
  28
  29 Required properties on each child node (= slot):
  30  - compatible : must be "mmc-slot" (see mmc.txt within this directory)
  31  - reg : the slot (or "port") ID
  32
  33 Optional properties on each child node (= slot):
  34  - bus-width : must be 1 or 4 (8-bit bus is not supported)
  35  - for cd and all other additional generic mmc parameters
  36    please refer to mmc.txt within this directory
  37
  38 Examples:
  39         mmc@c1108c20 {
  40                 compatible = "amlogic,meson8-sdio", "amlogic,meson-mx-sdio";
  41                 reg = <0xc1108c20 0x20>;
  42                 interrupts = <0 28 1>;
  43                 #address-cells = <1>;
  44                 #size-cells = <0>;
  45                 clocks = <&clkc CLKID_SDIO>, <&clkc CLKID_CLK81>;
  46                 clock-names = "core", "clkin";
  47
  48                 slot@1 {
  49                         compatible = "mmc-slot";
  50                         reg = <1>;
  51
  52                         bus-width = <4>;
  53                 };
  54         };