Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt

   1 * The simple MMC power sequence provider
   2
   3 The purpose of the simple MMC power sequence provider is to supports a set of
   4 common properties between various SOC designs. It thus enables us to use the
   5 same provider for several SOC designs.
   6
   7 Required properties:
   8 - compatible : contains "mmc-pwrseq-simple".
   9
  10 Optional properties:
  11 - reset-gpios : contains a list of GPIO specifiers. The reset GPIOs are asserted
  12         at initialization and prior we start the power up procedure of the card.
  13         They will be de-asserted right after the power has been provided to the
  14         card.
  15 - clocks : Must contain an entry for the entry in clock-names.
  16   See ../clocks/clock-bindings.txt for details.
  17 - clock-names : Must include the following entry:
  18   "ext_clock" (External clock provided to the card).
  19 - post-power-on-delay-ms : Delay in ms after powering the card and
  20         de-asserting the reset-gpios (if any)
  21 - power-off-delay-us : Delay in us after asserting the reset-gpios (if any)
  22         during power off of the card.
  23
  24 Example:
  25
  26         sdhci0_pwrseq {
  27                 compatible = "mmc-pwrseq-simple";
  28                 reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
  29                 clocks = <&clk_32768_ck>;
  30                 clock-names = "ext_clock";
  31         }