Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt

   1 * Freescale Enhanced Secure Digital Host Controller (eSDHC) for i.MX
   2
   3 The Enhanced Secure Digital Host Controller on Freescale i.MX family
   4 provides an interface for MMC, SD, and SDIO 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 sdhci-esdhc-imx driver.
   8
   9 Required properties:
  10 - compatible : Should be "fsl,<chip>-esdhc"
  11
  12 Optional properties:
  13 - fsl,cd-controller : Indicate to use controller internal card detection
  14 - fsl,wp-controller : Indicate to use controller internal write protection
  15 - fsl,delay-line : Specify the number of delay cells for override mode.
  16   This is used to set the clock delay for DLL(Delay Line) on override mode
  17   to select a proper data sampling window in case the clock quality is not good
  18   due to signal path is too long on the board. Please refer to eSDHC/uSDHC
  19   chapter, DLL (Delay Line) section in RM for details.
  20
  21 Examples:
  22
  23 esdhc@70004000 {
  24         compatible = "fsl,imx51-esdhc";
  25         reg = <0x70004000 0x4000>;
  26         interrupts = <1>;
  27         fsl,cd-controller;
  28         fsl,wp-controller;
  29 };
  30
  31 esdhc@70008000 {
  32         compatible = "fsl,imx51-esdhc";
  33         reg = <0x70008000 0x4000>;
  34         interrupts = <2>;
  35         cd-gpios = <&gpio1 6 0>; /* GPIO1_6 */
  36         wp-gpios = <&gpio1 5 0>; /* GPIO1_5 */
  37 };