Am Mittwoch, den 13.07.2016, 10:06 +0800 schrieb Peter Chen: > Add binding doc for generic power sequence library. > > Signed-off-by: Peter Chen <peter.c...@nxp.com> > --- > .../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,
I would replace "to let the device work normally" with "before the device can be enumerated [on the bus]" here. > 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 As Joshua pointed out, is this even needed at all? > +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. With the above two issues sorted out, Acked-by: Philipp Zabel <p.za...@pengutronix.de> regards Philipp -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
