From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752983AbbDBNNt (ORCPT ); Thu, 2 Apr 2015 09:13:49 -0400 Received: from mailout2.samsung.com ([203.254.224.25]:33037 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752692AbbDBNNn (ORCPT ); Thu, 2 Apr 2015 09:13:43 -0400 X-AuditID: cbfee61a-f79c06d000004e71-11-551d40850977 From: Robert Baldyga To: cw00.choi@samsung.com Cc: myungjoo.ham@samsung.com, rogerq@ti.com, linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, m.szyprowski@samsung.com, Robert Baldyga Subject: [PATCH v3 4/4] Documentation: extcon: usb-gpio: update usb-gpio binding description Date: Thu, 02 Apr 2015 15:13:05 +0200 Message-id: <1427980385-21285-5-git-send-email-r.baldyga@samsung.com> X-Mailer: git-send-email 1.9.1 In-reply-to: <1427980385-21285-1-git-send-email-r.baldyga@samsung.com> References: <1427980385-21285-1-git-send-email-r.baldyga@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuplluLIzCtJLcpLzFFi42I5/e+xoG6rg2yowevZphbXvzxntZh/5Byr xeVdc9gsFi1rZbZYe+Quu8XtxhVsFg8O72S36Hmk5cDh0bdlFaPH8RvbmTw+b5ILYI7isklJ zcksSy3St0vgyrh+ezJrwV7BijeXZjM1MC7i62Lk5JAQMJF4um8/O4QtJnHh3nq2LkYuDiGB 6YwSO64dhXJ+Mkr83/6ECaSKTUBHYsv3CYxdjBwcIgKSEi37zEBqmAWOMUq8+f2cBaRGWCBO ouv/DGYQm0VAVWLerA/sIPW8Aq4S6y8EQSyTkzh5bDIriM0p4CZxd8t2sFYhoJKDK2+xTWDk XcDIsIpRNLUguaA4KT3XUK84Mbe4NC9dLzk/dxMjOJCeSe1gXNlgcYhRgINRiYc3Y49MqBBr YllxZe4hRgkOZiUR3gfasqFCvCmJlVWpRfnxRaU5qcWHGKU5WJTEeZXs20KEBNITS1KzU1ML UotgskwcnFINjKV8zD8E1/Jb/vkTV9rKN8fOeE+a2bRMvkWT/AVNEhcbMzGJbb3SKD5h+3tl 0QZroei9f//WKVbUSM2s+3FLuuXl1tlL4k9kMN2/eLXEiOd5yaS31xxuse3a9cJ205aGC066 Dq4KIg8zrkV/fLj+3qcnjllFR2IXrFw3fe/tlhf/33HE/Z+1aasSS3FGoqEWc1FxIgBwQW2D IAIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add information about VBUS pin detection support, 'debounce' property and some other details. Signed-off-by: Robert Baldyga Acked-by: Roger Quadros --- .../devicetree/bindings/extcon/extcon-usb-gpio.txt | 28 ++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/extcon/extcon-usb-gpio.txt b/Documentation/devicetree/bindings/extcon/extcon-usb-gpio.txt index af0b903..7096f39 100644 --- a/Documentation/devicetree/bindings/extcon/extcon-usb-gpio.txt +++ b/Documentation/devicetree/bindings/extcon/extcon-usb-gpio.txt @@ -1,16 +1,40 @@ USB GPIO Extcon device -This is a virtual device used to generate USB cable states from the USB ID pin -connected to a GPIO pin. +This is a virtual device used to generate USB cable states from the USB +ID and VBUS signals connected to GPIO pins. + +The extcon cable states USB and USB_HOST are actually VBUS and !ID +pin states and do not indicate what mode the USB needs to operate in. +That decision is done by the USB stack. + +Some devices have only one of these GPIO pins, so we support cases when +only one of them is present. Hence properties 'id-gpio' and 'vbus-gpio' +are described as optional, but at least one of them has to be present +in extcon-usb-gpio node. + +In general we have three cases: +1. If VBUS and ID gpios are present we pass them as is + USB-HOST = !ID, USB = VBUS +2. If only VBUS gpio is present we assume that ID pin is always High. + USB-HOST = false, USB = VBUS. +3. If only ID pin is available we infer the VBUS pin states based on ID. + USB-HOST = !ID, USB = ID Required properties: - compatible: Should be "linux,extcon-usb-gpio" + +Optional properties - id-gpio: gpio for USB ID pin. See gpio binding. +- vbus-gpio: gpio for USB VBUS pin. See gpio binding. +- debounce: gpio debounce time in milliseconds (u32). + Example: Examples of extcon-usb-gpio node in dra7-evm.dts as listed below: extcon_usb1 { compatible = "linux,extcon-usb-gpio"; id-gpio = <&gpio6 1 GPIO_ACTIVE_HIGH>; + vbus-gpio = <&gpio6 2 GPIO_ACTIVE_HIGH>; + debounce = <25>; } &omap_dwc3_1 { -- 1.9.1