From patchwork Thu Sep 27 14:07:23 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guennadi Liakhovetski X-Patchwork-Id: 1514381 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 3D7FB3FE1C for ; Thu, 27 Sep 2012 14:07:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753399Ab2I0OHv (ORCPT ); Thu, 27 Sep 2012 10:07:51 -0400 Received: from moutng.kundenserver.de ([212.227.17.8]:60078 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752183Ab2I0OHt (ORCPT ); Thu, 27 Sep 2012 10:07:49 -0400 Received: from axis700.grange (dslb-178-001-228-192.pools.arcor-ip.net [178.1.228.192]) by mrelayeu.kundenserver.de (node=mreu1) with ESMTP (Nemesis) id 0MbcQr-1SyjtS1ttV-00IylY; Thu, 27 Sep 2012 16:07:36 +0200 Received: from 6a.grange (6a.grange [192.168.1.11]) by axis700.grange (Postfix) with ESMTPS id A0374189B0D; Thu, 27 Sep 2012 16:07:34 +0200 (CEST) Received: from lyakh by 6a.grange with local (Exim 4.72) (envelope-from ) id 1THEkY-0007SB-5E; Thu, 27 Sep 2012 16:07:34 +0200 From: Guennadi Liakhovetski To: linux-media@vger.kernel.org Cc: devicetree-discuss@lists.ozlabs.org, Sylwester Nawrocki , Laurent Pinchart , Hans Verkuil , Magnus Damm , linux-sh@vger.kernel.org, Mark Brown , Stephen Warren , Arnd Bergmann , Grant Likely Subject: [PATCH 04/14] media: add V4L2 DT binding documentation Date: Thu, 27 Sep 2012 16:07:23 +0200 Message-Id: <1348754853-28619-5-git-send-email-g.liakhovetski@gmx.de> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1348754853-28619-1-git-send-email-g.liakhovetski@gmx.de> References: <1348754853-28619-1-git-send-email-g.liakhovetski@gmx.de> X-Provags-ID: V02:K0:4UFyDY+DJ+s8JIFK532ozMi4s29eiLwbBz9f3r5FNmA NFfsLF098/x5MtqHQQ86kkTRoSb7aCUEFuqWP8KVAXAOb4NKwW +VPnz0wMgEZ0DUKMELVxqbOYHfZvSFh4lf0K2ab7kOfkouX+eZ ht5t7KYByVcHbRYL6erWBv5SXDT1ovxLTFumeeFDElOGOA1wvM OjxXqqS4NRYXQdbLoWrUairS7vwqzdr9OapTGtn3H0pRdoMeqI rHBoS5ECkBX7UoJ0tj0Snbrsla56dOvmV2Xn5z0MWNzX4JJytj PO8zPpzVk/jSoAcztLyOV2EnrbWPLs5eVM9hnZ7LWce6qZT141 XyfOS4HKOPr9trTD38WismFQOClBlFcwEp6TU10ypeG/qzReq8 d0Q9kN5Xx+EsQ== Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch adds a document, describing common V4L2 device tree bindings. Co-authored-by: Sylwester Nawrocki Signed-off-by: Guennadi Liakhovetski --- Documentation/devicetree/bindings/media/v4l2.txt | 162 ++++++++++++++++++++++ 1 files changed, 162 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/media/v4l2.txt diff --git a/Documentation/devicetree/bindings/media/v4l2.txt b/Documentation/devicetree/bindings/media/v4l2.txt new file mode 100644 index 0000000..b8b3f41 --- /dev/null +++ b/Documentation/devicetree/bindings/media/v4l2.txt @@ -0,0 +1,162 @@ +Video4Linux Version 2 (V4L2) + +General concept +--------------- + +Video pipelines consist of external devices, e.g. camera sensors, controlled +over an I2C, SPI or UART bus, and SoC internal IP blocks, including video DMA +engines and video data processors. + +SoC internal blocks are described by DT nodes, placed similarly to other SoC +blocks. External devices are represented as child nodes of their respective bus +controller nodes, e.g. I2C. + +Data interfaces on all video devices are described by "port" child DT nodes. +Configuration of a port depends on other devices participating in the data +transfer and is described by "link" DT nodes, specified as children of the +"port" nodes: + +/foo { + port@0 { + link@0 { ... }; + link@1 { ... }; + }; + port@1 { ... }; +}; + +If a port can be configured to work with more than one other device on the same +bus, a "link" child DT node must be provided for each of them. If more than one +port is present on a device or more than one link is connected to a port, a +common scheme, using "#address-cells," "#size-cells" and "reg" properties is +used. + +Optional link properties: +- remote: phandle to the other endpoint link DT node. +- slave-mode: a boolean property, run the link in slave mode. Default is master + mode. +- data-shift: on parallel data busses, if data-width is used to specify the + number of data lines, data-shift can be used to specify which data lines are + used, e.g. "data-width=<10>; data-shift=<2>;" means, that lines 9:2 are used. +- hsync-active: 1 or 0 for active-high or -low HSYNC signal polarity + respectively. +- vsync-active: ditto for VSYNC. Note, that if HSYNC and VSYNC polarities are + not specified, embedded synchronisation may be required, where supported. +- data-active: similar to HSYNC and VSYNC specifies data line polarity. +- field-even-active: field signal level during the even field data transmission. +- pclk-sample: rising (1) or falling (0) edge to sample the pixel clock pin. +- data-lanes: array of serial, e.g. MIPI CSI-2, data hardware lane numbers in + the ascending order, beginning with logical lane 0. +- clock-lanes: hardware lane number, used for the clock lane. +- clock-noncontinuous: a boolean property to allow MIPI CSI-2 non-continuous + clock mode. + +Example: + + ceu0: ceu@0xfe910000 { + compatible = "renesas,sh-mobile-ceu"; + reg = <0xfe910000 0xa0>; + interrupts = <0x880>; + + mclk: master_clock { + compatible = "renesas,ceu-clock"; + #clock-cells = <1>; + clock-frequency = <50000000>; /* max clock frequency */ + clock-output-names = "mclk"; + }; + + port { + #address-cells = <1>; + #size-cells = <0>; + + ceu0_1: link@1 { + reg = <1>; /* local link # */ + remote = <&ov772x_1_1>; /* remote phandle */ + bus-width = <8>; /* used data lines */ + data-shift = <0>; /* lines 7:0 are used */ + + /* If [hv]sync-active are missing, embedded bt.605 sync is used */ + hsync-active = <1>; /* active high */ + vsync-active = <1>; /* active high */ + data-active = <1>; /* active high */ + pclk-sample = <1>; /* rising */ + }; + + ceu0_0: link@0 { + reg = <0>; + remote = <&csi2_2>; + immutable; + }; + }; + }; + + i2c0: i2c@0xfff20000 { + ... + ov772x_1: camera@0x21 { + compatible = "omnivision,ov772x"; + reg = <0x21>; + vddio-supply = <®ulator1>; + vddcore-supply = <®ulator2>; + + clock-frequency = <20000000>; + clocks = <&mclk 0>; + clock-names = "xclk"; + + port { + /* With 1 link per port no need in addresses */ + ov772x_1_1: link { + bus-width = <8>; + remote = <&ceu0_1>; + hsync-active = <1>; + vsync-active = <0>; /* who came up with an inverter here?... */ + data-active = <1>; + pclk-sample = <1>; + }; + }; + }; + + imx074: camera@0x1a { + compatible = "sony,imx074"; + reg = <0x1a>; + vddio-supply = <®ulator1>; + vddcore-supply = <®ulator2>; + + clock-frequency = <30000000>; /* shared clock with ov772x_1 */ + clocks = <&mclk 0>; + clock-names = "sysclk"; /* assuming this is the name in the datasheet */ + + port { + imx074_1: link { + clock-lanes = <0>; + data-lanes = <1>, <2>; + remote = <&csi2_1>; + }; + }; + }; + }; + + csi2: csi2@0xffc90000 { + compatible = "renesas,sh-mobile-csi2"; + reg = <0xffc90000 0x1000>; + interrupts = <0x17a0>; + #address-cells = <1>; + #size-cells = <0>; + + port@1 { + compatible = "renesas,csi2c"; /* one of CSI2I and CSI2C */ + reg = <1>; /* CSI-2 PHY #1 of 2: PHY_S, PHY_M has port address 0, is unused */ + + csi2_1: link { + clock-lanes = <0>; + data-lanes = <2>, <1>; + remote = <&imx074_1>; + }; + }; + port@2 { + reg = <2>; /* port 2: link to the CEU */ + + csi2_2: link { + immutable; + remote = <&ceu0_0>; + }; + }; + };