Bindings/mmc/atmel-hsmci.txt

   1 * Atmel High Speed MultiMedia Card Interface
   2
   3 This controller on atmel products provides an interface for MMC, SD and SDIO
   4 types of memory cards.
   5
   6 This file documents differences between the core properties described
   7 by mmc.txt and the properties used by the atmel-mci driver.
   8
   9 1) MCI node
  10
  11 Required properties:
  12 - compatible: should be "atmel,hsmci"
  13 - #address-cells: should be one. The cell is the slot id.
  14 - #size-cells: should be zero.
  15 - at least one slot node
  16 - clock-names: tuple listing input clock names.
  17         Required elements: "mci_clk"
  18 - clocks: phandles to input clocks.
  19
  20 The node contains child nodes for each slot that the platform uses
  21
  22 Example MCI node:
  23
  24 mmc0: mmc@f0008000 {
  25         compatible = "atmel,hsmci";
  26         reg = <0xf0008000 0x600>;
  27         interrupts = <12 4>;
  28         #address-cells = <1>;
  29         #size-cells = <0>;
  30         clock-names = "mci_clk";
  31         clocks = <&mci0_clk>;
  32
  33         [ child node definitions...]
  34 };
  35
  36 2) slot nodes
  37
  38 Required properties:
  39 - reg: should contain the slot id.
  40 - bus-width: number of data lines connected to the controller
  41
  42 Optional properties:
  43 - cd-gpios: specify GPIOs for card detection
  44 - cd-inverted: invert the value of external card detect gpio line
  45 - wp-gpios: specify GPIOs for write protection
  46
  47 Example slot node:
  48
  49 slot@0 {
  50         reg = <0>;
  51         bus-width = <4>;
  52         cd-gpios = <&pioD 15 0>
  53         cd-inverted;
  54 };
  55
  56 Example full MCI node:
  57 mmc0: mmc@f0008000 {
  58         compatible = "atmel,hsmci";
  59         reg = <0xf0008000 0x600>;
  60         interrupts = <12 4>;
  61         #address-cells = <1>;
  62         #size-cells = <0>;
  63         slot@0 {
  64                 reg = <0>;
  65                 bus-width = <4>;
  66                 cd-gpios = <&pioD 15 0>
  67                 cd-inverted;
  68         };
  69         slot@1 {
  70                 reg = <1>;
  71                 bus-width = <4>;
  72         };
  73 };