atmel-hsmci.txt

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    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 };

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