From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Chen Subject: [PATCH 1/6] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library Date: Thu, 7 Jul 2016 17:14:47 +0800 Message-ID: <1467882892-27589-2-git-send-email-peter.chen@nxp.com> References: <1467882892-27589-1-git-send-email-peter.chen@nxp.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1467882892-27589-1-git-send-email-peter.chen-3arQi8VN3Tc@public.gmane.org> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org, ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, shawnguo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org Cc: k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, pawel.moll-5wv7dgnIgG8@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, mail-APzI5cXaD1zVlRWJc41N0YvC60bnQu0Y@public.gmane.org, troy.kisky-Q5RJGjKts06CY9SHAMCTRUEOCMrvLtNR@public.gmane.org, festevam-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, oscar-Bdbr4918Nnnk1uMJSBkQmQ@public.gmane.org, stephen.boyd-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Peter Chen 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 | 56 ++++++++++++++++++++++ 1 file changed, 56 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..4b23834 --- /dev/null +++ b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt @@ -0,0 +1,56 @@ +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. +- clock-name: must be "pwrseq-clk" +- pwrseq-reset-gpios: Should specify the GPIO for reset. +- pwrseq-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>; + clock-names = "pwrseq-clk"; + pwrseq-reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>; /* hub reset pin */ + pwrseq-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>; + clock-names = "pwrseq-clk"; + pwrseq-reset-gpios = <&gpio4 6 GPIO_ACTIVE_LOW>; /* ethernet_rst */ + pwrseq-reset-duration-us = <15>; + }; + }; +}; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html