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Date: Tue, 8 Nov 2016 10:51:05 +0800 From: Peter Chen <peter.chen@....com> To: <gregkh@...uxfoundation.org>, <stern@...land.harvard.edu>, <ulf.hansson@...aro.org>, <broonie@...nel.org>, <sre@...nel.org>, <robh+dt@...nel.org>, <shawnguo@...nel.org>, <rjw@...ysocki.net>, <dbaryshkov@...il.com> CC: <heiko@...ech.de>, <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>, <vaibhav.hiremath@...aro.org>, <gary.bisson@...ndarydevices.com>, Peter Chen <peter.chen@....com> Subject: [PATCH v9 1/8] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library 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"; + reg = <1>; + + clocks = <&clks IMX6SX_CLK_IPG>; + reset-gpios = <&gpio4 6 GPIO_ACTIVE_LOW>; /* ethernet_rst */ + reset-duration-us = <15>; + }; + }; +}; -- 2.7.4
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