doc/device-tree-bindings/mmc/snps,dw-mmc.txt

   1 Synopsys Designware Mobile Storage Host Controller extensions
   2 used in Synopsys ARC devboards
   3
   4 Required Properties:
   5
   6 * compatible: should be - "snps,dw-mshc".
   7 * bus-width: number of data lines connected to the controller.
   8 * clocks: from common clock binding: handle to biu and ciu clocks for the
   9   bus interface unit clock and the card interface unit clock.
  10 * clock-names: from common clock binding: Shall be "biu" and "ciu".
  11
  12 Optional properties:
  13
  14 * fifo-depth: The maximum size of the tx/rx fifo's. If this property is not
  15   specified, the default value of the fifo size is determined from the
  16   controller registers.
  17 * fifo-mode: Don't use DMA.
  18 * max-frequency: Maximum operating clock frequency, driver uses 'ciu' clock
  19   frequency if it is not set.
  20
  21 Example:
  22
  23 mmc0@f000a000 {
  24         compatible = "snps,dw-mshc";
  25         reg = <0xf000a000 0x400>;
  26
  27         bus-width = <4>;
  28         fifo-depth = <256>;
  29         clocks = <&mmcclk_biu>, <&mmcclk_ciu>;
  30         clock-names = "biu", "ciu";
  31         max-frequency = <25000000>;
  32 };
  33