From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753889AbcITDhP (ORCPT ); Mon, 19 Sep 2016 23:37:15 -0400 Received: from mail-co1nam03on0063.outbound.protection.outlook.com ([104.47.40.63]:16867 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753778AbcITDhK (ORCPT ); Mon, 19 Sep 2016 23:37:10 -0400 Authentication-Results: spf=fail (sender IP is 192.88.168.50) smtp.mailfrom=nxp.com; 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; From: Peter Chen To: , , , , , , , , CC: , , , , , , , , , , , , , , , , , , , Peter Chen Subject: [PATCH v7 1/8] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library Date: Tue, 20 Sep 2016 11:36:40 +0800 Message-ID: <1474342607-27512-2-git-send-email-peter.chen@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1474342607-27512-1-git-send-email-peter.chen@nxp.com> References: <1474342607-27512-1-git-send-email-peter.chen@nxp.com> X-EOPAttributedMessage: 0 X-Matching-Connectors: 131188162271543363;(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)(7916002)(2980300002)(1109001)(1110001)(339900001)(199003)(189002)(81166006)(8666005)(81156014)(92566002)(36756003)(104016004)(8936002)(50226002)(8676002)(19580395003)(19580405001)(86362001)(575784001)(97736004)(356003)(2201001)(5003940100001)(7846002)(33646002)(305945005)(77096005)(85426001)(2906002)(105606002)(50466002)(2950100001)(68736007)(5660300001)(106466001)(87936001)(2171001)(47776003)(4326007)(48376002)(50986999)(76176999)(7416002)(229853001)(586003)(626004)(5001770100001)(11100500001)(189998001)(41533002)(7059030)(2101003);DIR:OUT;SFP:1101;SCL:1;SRVR:BLUPR0301MB2004;H:tx30smr01.am.freescale.net;FPR:;SPF:Fail;PTR:InfoDomainNonexistent;A:1;MX:1;LANG:en; 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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>; + }; + }; +}; -- 2.7.4