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Mon, 12 Jun 2017 18:59:59 -0700 From: Peter Chen To: , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , Peter Chen Subject: [PATCH v15 1/7] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library Date: Tue, 13 Jun 2017 09:59:20 +0800 Message-ID: <1497319166-17287-2-git-send-email-peter.chen@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1497319166-17287-1-git-send-email-peter.chen@nxp.com> References: <1497319166-17287-1-git-send-email-peter.chen@nxp.com> X-EOPAttributedMessage: 0 X-Matching-Connectors: 131417928084101201; (91ab9b29-cfa4-454e-5278-08d120cd25b8); () X-Forefront-Antispam-Report: CIP:192.88.168.50; IPV:NLI; CTRY:US; EFV:NLI; SFV:NSPM; SFS:(10009020)(6009001)(336005)(39850400002)(39400400002)(39860400002)(39450400003)(39380400002)(39410400002)(39840400002)(2980300002)(1110001)(1109001)(339900001)(189002)(199003)(9170700003)(7416002)(86362001)(7406005)(5003940100001)(33646002)(104016004)(189998001)(2201001)(5660300001)(498600001)(85426001)(50986999)(575784001)(36756003)(4326008)(8676002)(77096006)(50226002)(53936002)(54906002)(106466001)(47776003)(39060400002)(8656002)(356003)(6666003)(76176999)(105606002)(305945005)(2906002)(2171002)(38730400002)(8936002)(2950100002)(48376002)(50466002)(81166006)(41533002); 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Signed-off-by: Peter Chen Acked-by: Philipp Zabel Acked-by: Rob Herring --- .../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>; + }; + }; +};