Documentation/devicetree/bindings/mmc/renesas,mmcif.txt

   1 * Renesas Multi Media Card Interface (MMCIF) Controller
   2
   3 This file documents differences between the core properties in mmc.txt
   4 and the properties used by the MMCIF device.
   5
   6
   7 Required properties:
   8
   9 - compatible: should be "renesas,mmcif-<soctype>", "renesas,sh-mmcif" as a
  10   fallback. Examples with <soctype> are:
  11         - "renesas,mmcif-r8a7740" for the MMCIF found in r8a7740 SoCs
  12         - "renesas,mmcif-r8a7790" for the MMCIF found in r8a7790 SoCs
  13         - "renesas,mmcif-r8a7791" for the MMCIF found in r8a7791 SoCs
  14         - "renesas,mmcif-r8a7794" for the MMCIF found in r8a7794 SoCs
  15
  16 - clocks: reference to the functional clock
  17
  18 - dmas: reference to the DMA channels, one per channel name listed in the
  19   dma-names property.
  20 - dma-names: must contain "tx" for the transmit DMA channel and "rx" for the
  21   receive DMA channel.
  22 - max-frequency: Maximum operating clock frequency, driver uses default clock
  23   frequency if it is not set.
  24
  25
  26 Example: R8A7790 (R-Car H2) MMCIF0
  27
  28         mmcif0: mmc@ee200000 {
  29                 compatible = "renesas,mmcif-r8a7790", "renesas,sh-mmcif";
  30                 reg = <0 0xee200000 0 0x80>;
  31                 interrupts = <0 169 IRQ_TYPE_LEVEL_HIGH>;
  32                 clocks = <&mstp3_clks R8A7790_CLK_MMCIF0>;
  33                 dmas = <&dmac0 0xd1>, <&dmac0 0xd2>;
  34                 dma-names = "tx", "rx";
  35                 max-frequency = <97500000>;
  36         };