From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Subject: Re: [PATCH v2 1/6] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library Date: Sat, 16 Jul 2016 17:30:57 -0500 Message-ID: <20160716223057.GA8984@rob-hp-laptop> References: <1468375610-18625-1-git-send-email-peter.chen@nxp.com> <1468375610-18625-2-git-send-email-peter.chen@nxp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1468375610-18625-2-git-send-email-peter.chen@nxp.com> Sender: linux-pm-owner@vger.kernel.org To: Peter Chen Cc: gregkh@linuxfoundation.org, stern@rowland.harvard.edu, ulf.hansson@linaro.org, broonie@kernel.org, sre@kernel.org, shawnguo@kernel.org, mark.rutland@arm.com, devicetree@vger.kernel.org, k.kozlowski@samsung.com, stephen.boyd@linaro.org, oscar@naiandei.net, arnd@arndb.de, pawel.moll@arm.com, linux-pm@vger.kernel.org, s.hauer@pengutronix.de, linux-usb@vger.kernel.org, mail@maciej.szmigiero.name, troy.kisky@boundarydevices.com, stillcompiling@gmail.com, p.zabel@pengutronix.de, festevam@gmail.com, linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org 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 > --- > .../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>; > + }; > + }; > +}; > -- > 1.9.1 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel