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nxp.com; dkim=none (message not signed) header.d=none; nxp.com; dmarc=fail action=none header.from=nxp.com; nxp.com; dkim=none (message not signed) header.d=none; Received-SPF: Fail (protection.outlook.com: domain of nxp.com does not designate 192.88.168.50 as permitted sender) receiver=protection.outlook.com; client-ip=192.88.168.50; helo=tx30smr01.am.freescale.net; Received: from tx30smr01.am.freescale.net (192.88.168.50) by BN1BFFO11FD050.mail.protection.outlook.com (10.58.145.5) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.629.5 via Frontend Transport; Fri, 14 Oct 2016 03:00:26 +0000 Received: from b29397-desktop.ap.freescale.net (b29397-desktop.ap.freescale.net [10.192.242.114]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id u9E3085P011345; Thu, 13 Oct 2016 20:00:18 -0700 From: Peter Chen To: , , , , , , , CC: , , , , , , , , , , , , , , , , , , , Peter Chen Subject: [PATCH v8 1/8] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library Date: Fri, 14 Oct 2016 10:59:48 +0800 Message-ID: <1476413995-20361-2-git-send-email-peter.chen@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1476413995-20361-1-git-send-email-peter.chen@nxp.com> References: <1476413995-20361-1-git-send-email-peter.chen@nxp.com> X-EOPAttributedMessage: 0 X-Matching-Connectors: 131208876265968225; 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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>; + }; + }; +};