From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757213AbaDWHby (ORCPT ); Wed, 23 Apr 2014 03:31:54 -0400 Received: from mail-bn1lp0141.outbound.protection.outlook.com ([207.46.163.141]:6845 "EHLO na01-bn1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756528AbaDWHao (ORCPT ); Wed, 23 Apr 2014 03:30:44 -0400 From: Xiubo Li To: , CC: , , , , , , , Xiubo Li Subject: [PATCHv2 1/3] dt/bindings: Add the DT binding documentation for endianness Date: Wed, 23 Apr 2014 14:46:33 +0800 Message-ID: <1398235595-13370-2-git-send-email-Li.Xiubo@freescale.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1398235595-13370-1-git-send-email-Li.Xiubo@freescale.com> References: <1398235595-13370-1-git-send-email-Li.Xiubo@freescale.com> X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:192.88.158.246;CTRY:US;IPV:NLI;EFV:NLI;SFV:NSPM;SFS:(10009001)(6009001)(428001)(199002)(189002)(89996001)(77156001)(48376002)(46102001)(80022001)(36756003)(88136002)(85852003)(83072002)(86362001)(99396002)(20776003)(50466002)(77096999)(76176999)(50986999)(6806004)(77982001)(81342001)(62966002)(81542001)(19580405001)(83322001)(87936001)(19580395003)(50226001)(44976005)(79102001)(92726001)(47776003)(92566001)(74502001)(74662001)(31966008)(76482001)(87286001)(4396001)(80976001);DIR:OUT;SFP:1101;SCL:1;SRVR:BL2PR03MB498;H:az84smr01.freescale.net;FPR:CA5D5FFF.2D860429.40459B36.86A0E241.201A8;MLV:sfv;PTR:gate-az5.freescale.com;A:1;MX:1;LANG:en; MIME-Version: 1.0 Content-Type: text/plain X-Forefront-PRVS: 01901B3451 X-OriginatorOrg: freescale.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Xiubo Li --- .../devicetree/bindings/endianness/endianness.txt | 55 ++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 Documentation/devicetree/bindings/endianness/endianness.txt diff --git a/Documentation/devicetree/bindings/endianness/endianness.txt b/Documentation/devicetree/bindings/endianness/endianness.txt new file mode 100644 index 0000000..64f1d5e --- /dev/null +++ b/Documentation/devicetree/bindings/endianness/endianness.txt @@ -0,0 +1,55 @@ +Device-Tree binding for device endianness + +The endianness mode of CPU & Device scenarios: + Index CPU Device + ------------------------ + 1 LE LE + 2 LE BE + 3 BE BE + 4 BE LE + +For one device driver, which will run in different scenarios above +on different SoCs using the devicetree, we need one way to simplify +this. + +Required properties: +- [prefix]-endian: this is one string property and must be one + of 'be', 'le' and 'native' if it is present. + +The endianness mode: + 'le' : device is in little endian mode, + 'be' : device is in big endian mode, + 'native' : device is in the same endian mode with the CPU. + +Examples: +Scenario 1 : CPU in LE mode & device in LE mode. +dev: dev@40031000 { + compatible = "name"; + reg = <0x40031000 0x1000>; + ... + [prefix]-endian = 'native'; +}; + +Scenario 2 : CPU in LE mode & device in BE mode. +dev: dev@40031000 { + compatible = "name"; + reg = <0x40031000 0x1000>; + ... + [prefix]-endian = 'be'; +}; + +Scenario 3 : CPU in BE mode & device in BE mode. +dev: dev@40031000 { + compatible = "name"; + reg = <0x40031000 0x1000>; + ... + [prefix]-endian = 'native'; +}; + +Scenario 4 : CPU in BE mode & device in LE mode. +dev: dev@40031000 { + compatible = "name"; + reg = <0x40031000 0x1000>; + ... + [prefix]-endian = 'le'; +}; -- 1.8.4