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Date: Thu, 1 Sep 2016 13:33:22 +0530 From: Vaibhav Hiremath <vaibhav.hiremath@...aro.org> To: Peter Chen <peter.chen@....com>, gregkh@...uxfoundation.org, stern@...land.harvard.edu, ulf.hansson@...aro.org, broonie@...nel.org, sre@...nel.org, robh+dt@...nel.org, shawnguo@...nel.org, dbaryshkov@...il.com, dwmw3@...radead.org Cc: k.kozlowski@...sung.com, linux-arm-kernel@...ts.infradead.org, p.zabel@...gutronix.de, devicetree@...r.kernel.org, pawel.moll@....com, mark.rutland@....com, linux-usb@...r.kernel.org, arnd@...db.de, s.hauer@...gutronix.de, mail@...iej.szmigiero.name, troy.kisky@...ndarydevices.com, festevam@...il.com, oscar@...andei.net, stephen.boyd@...aro.org, linux-pm@...r.kernel.org, stillcompiling@...il.com, linux-kernel@...r.kernel.org, mka@...omium.org Subject: Re: [PATCH v6 1/8] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library On Monday 15 August 2016 02:43 PM, Peter Chen wrote: > Add binding doc for generic power sequence library. > > Signed-off-by: Peter Chen <peter.chen@....com> > Acked-by: Philipp Zabel <p.zabel@...gutronix.de> > Acked-by: Rob Herring <robh@...nel.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 = <®_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"; So I assume, with our recent discussion and the change we are proposing, the library would have some knowledge about this compatible string, right? what I was asking on other email was, how are you connecting multiple power sequence libraries to their respective consumers ? Thanks, Vaibhav > + reg = <1>; > + > + clocks = <&clks IMX6SX_CLK_IPG>; > + reset-gpios = <&gpio4 6 GPIO_ACTIVE_LOW>; /* ethernet_rst */ > + reset-duration-us = <15>; > + }; > + }; > +}; -- Thanks, Vaibhav
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