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    Subject[PATCH v5 1/6] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library
    Date
    Add binding doc for generic power sequence library.

    Signed-off-by: Peter Chen <peter.chen@nxp.com>
    Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
    Acked-by: Rob Herring <robh@kernel.org>
    ---
    .../bindings/power/pwrseq/pwrseq-generic.txt | 48 ++++++++++++++++++++++
    1 file changed, 48 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt

    diff --git a/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
    new file mode 100644
    index 0000000..ebf0d47
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
    @@ -0,0 +1,48 @@
    +The generic power sequence library
    +
    +Some hard-wired devices (eg USB/MMC) need to do power sequence before
    +the device can be enumerated on the bus, the typical power sequence
    +like: enable USB PHY clock, toggle reset pin, etc. But current
    +Linux device driver lacks of such code to do it, it may cause some
    +hard-wired devices works abnormal or can't be recognized by
    +controller at all. The power sequence will be done before this device
    +can be found at the bus.
    +
    +The power sequence properties is under the device node.
    +
    +Optional properties:
    +- clocks: the input clocks for device.
    +- reset-gpios: Should specify the GPIO for reset.
    +- reset-duration-us: the duration in microsecond for assert reset signal.
    +
    +Below is the example of USB power sequence properties on USB device
    +nodes which have two level USB hubs.
    +
    +&usbotg1 {
    + vbus-supply = <&reg_usb_otg1_vbus>;
    + pinctrl-names = "default";
    + pinctrl-0 = <&pinctrl_usb_otg1_id>;
    + status = "okay";
    +
    + #address-cells = <1>;
    + #size-cells = <0>;
    + genesys: hub@1 {
    + compatible = "usb5e3,608";
    + reg = <1>;
    +
    + clocks = <&clks IMX6SX_CLK_CKO>;
    + reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>; /* hub reset pin */
    + reset-duration-us = <10>;
    +
    + #address-cells = <1>;
    + #size-cells = <0>;
    + asix: ethernet@1 {
    + compatible = "usbb95,1708";
    + reg = <1>;
    +
    + clocks = <&clks IMX6SX_CLK_IPG>;
    + reset-gpios = <&gpio4 6 GPIO_ACTIVE_LOW>; /* ethernet_rst */
    + reset-duration-us = <15>;
    + };
    + };
    +};
    --
    1.9.1
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