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Tue, 12 Jul 2016 19:14:35 -0700 From: Peter Chen To: , , , , , , CC: , , , , , , , , , , , , , , , , Peter Chen Subject: [PATCH v2 1/6] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library Date: Wed, 13 Jul 2016 10:06:45 +0800 Message-ID: <1468375610-18625-2-git-send-email-peter.chen@nxp.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1468375610-18625-1-git-send-email-peter.chen@nxp.com> References: <1468375610-18625-1-git-send-email-peter.chen@nxp.com> X-EOPAttributedMessage: 0 X-Matching-Connectors: 131128496816391993; (91ab9b29-cfa4-454e-5278-08d120cd25b8); () X-Forefront-Antispam-Report: CIP:192.88.158.2; IPV:NLI; CTRY:US; EFV:NLI; SFV:NSPM; SFS:(10009020)(6009001)(7916002)(2980300002)(1110001)(1109001)(339900001)(189002)(199003)(36756003)(8666005)(6806005)(8936002)(104016004)(33646002)(189998001)(68736007)(586003)(97736004)(92566002)(50986999)(11100500001)(86362001)(356003)(7846002)(5001770100001)(77096005)(50226002)(19580395003)(81166006)(81156014)(47776003)(2906002)(5003940100001)(105606002)(4326007)(50466002)(8676002)(305945005)(69596002)(106466001)(19580405001)(85426001)(48376002)(2950100001)(2171001)(87936001)(2201001)(229853001)(76176999)(7059030)(41533002); 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Ip=[192.88.158.2]; Helo=[az84smr01.freescale.net] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR03MB2510 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add binding doc for generic power sequence library. Signed-off-by: Peter Chen Acked-by: Philipp Zabel --- .../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 { + 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 { + 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>; + }; + }; +};