From mboxrd@z Thu Jan 1 00:00:00 1970 From: 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> References: <1468375610-18625-1-git-send-email-peter.chen@nxp.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1468375610-18625-1-git-send-email-peter.chen@nxp.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: gregkh@linuxfoundation.org, stern@rowland.harvard.edu, ulf.hansson@linaro.org, broonie@kernel.org, sre@kernel.org, robh+dt@kernel.org, shawnguo@kernel.org Cc: 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, Peter Chen , p.zabel@pengutronix.de, festevam@gmail.com, linux-arm-kernel@lists.infradead.org List-Id: linux-pm@vger.kernel.org Add binding doc for generic power sequence library. 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 { + 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>; + }; + }; +}; -- 1.9.1