32 lines
1.1 KiB
Plaintext
32 lines
1.1 KiB
Plaintext
|
* 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";
|
||
|
|
}
|