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-rw-r--r-- | Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt new file mode 100644 index 000000000..9029b45b8 --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/mmc-pwrseq-simple.txt @@ -0,0 +1,31 @@ +* 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"; + } |