On Sat, Jul 16, 2016 at 05:30:57PM -0500, Rob Herring wrote: > On Wed, Jul 13, 2016 at 10:06:45AM +0800, Peter Chen wrote: > > Add binding doc for generic power sequence library. > > I'd written a review on last version, but forgot to send it out. Anyway, > I mostly had the same comments as Philipp and Joshua. A couple of things > they missed... > > > > > Signed-off-by: Peter Chen <peter.chen@xxxxxxx> > > --- > > .../bindings/power/pwrseq/pwrseq-generic.txt | 53 ++++++++++++++++++++++ > > 1 file changed, 53 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..186c58c > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt > > @@ -0,0 +1,53 @@ > > +The generic power sequence library > > + > > +Some hard-wired USB/MMC devices need to do power sequence to let the > > +device work normally, the typical power sequence like: enable USB > > +PHY clock, toggle reset pin, etc. But current Linux USB driver > > +lacks of such code to do it, it may cause some hard-wired USB 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 USB > > +bus. > > + > > +The power sequence properties is under the device node. > > + > > +Required properties: > > +- power-sequence: this device needs to do power sequence before enumeration > > + > > +Optional properties: > > +- clocks: the input clock 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 = <®_usb_otg1_vbus>; > > + pinctrl-names = "default"; > > + pinctrl-0 = <&pinctrl_usb_otg1_id>; > > + status = "okay"; > > + > > + #address-cells = <1>; > > + #size-cells = <0>; > > + hub: genesys@1 { > > genesys: hub@1 > > > + compatible = "usb5e3,608"; > > + reg = <1>; > > + > > + power-sequence; > > + 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>; > > + ethernet: asix@1 { > > asix: ethernet@1 > > > + compatible = "usbb95,1708"; > > + reg = <1>; > > + > > + power-sequence; > > + clocks = <&clks IMX6SX_CLK_IPG>; > > + reset-gpios = <&gpio4 6 GPIO_ACTIVE_LOW>; /* ethernet_rst */ > > + reset-duration-us = <15>; > > + }; > > + }; > > +}; Will change, thanks. -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html