[deliverable/linux.git] / Documentation / devicetree / 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)

Example:

	sdhci0_pwrseq {
		compatible = "mmc-pwrseq-simple";
		reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
		clocks = <&clk_32768_ck>;
		clock-names = "ext_clock";
	}
Commit	Line	Data
0e6d6332 UH	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:
a1d7579b JMC	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.
3f656a16 JMC	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).
958e6612 HG	19	- post-power-on-delay-ms : Delay in ms after powering the card and
958e6612 HG	20	de-asserting the reset-gpios (if any)
0e6d6332 UH	21
	22	Example:
	23
	24	sdhci0_pwrseq {
	25	compatible = "mmc-pwrseq-simple";
638a9818 AF	26	reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
	27	clocks = <&clk_32768_ck>;
	28	clock-names = "ext_clock";
0e6d6332	29	}