FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mmc/mmc-pwrseq-simple.txt

     * The simple MMC power sequence provider
     
     The purpose of the simple MMC power sequence provider is to supports a set of
     common properties between various SOC designs. It thus enables us to use the
     same provider for several SOC designs.
     
     Required properties:
     - compatible : contains "mmc-pwrseq-simple".
     
    Optional properties:
    - reset-gpios : contains a list of GPIO specifiers. The reset GPIOs are asserted
            at initialization and prior we start the power up procedure of the card.
            They will be de-asserted right after the power has been provided to the
            card.
    - clocks : Must contain an entry for the entry in clock-names.
      See ../clocks/clock-bindings.txt for details.
    - clock-names : Must include the following entry:
      "ext_clock" (External clock provided to the card).
    - post-power-on-delay-ms : Delay in ms after powering the card and
            de-asserting the reset-gpios (if any)
    - power-off-delay-us : Delay in us after asserting the reset-gpios (if any)
            during power off of the card.
    
    Example:
    
            sdhci0_pwrseq {
                    compatible = "mmc-pwrseq-simple";
                    reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
                    clocks = <&clk_32768_ck>;
                    clock-names = "ext_clock";
            }

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