From patchwork Wed Aug 19 04:20:02 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chen-Yu Tsai X-Patchwork-Id: 7035091 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id AB2E39F372 for ; Wed, 19 Aug 2015 04:26:30 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C8BDA20840 for ; Wed, 19 Aug 2015 04:26:29 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A59122084B for ; Wed, 19 Aug 2015 04:26:28 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZRusI-0005a0-Dp; Wed, 19 Aug 2015 04:21:18 +0000 Received: from smtp.csie.ntu.edu.tw ([140.112.30.61]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZRusE-0005YV-Rm for linux-arm-kernel@lists.infradead.org; Wed, 19 Aug 2015 04:21:15 +0000 Received: from mirror2.csie.ntu.edu.tw (mirror2.csie.ntu.edu.tw [140.112.30.76]) (Authenticated sender: b93043) by smtp.csie.ntu.edu.tw (Postfix) with ESMTPSA id 0CC7220191; Wed, 19 Aug 2015 12:20:37 +0800 (CST) Received: by mirror2.csie.ntu.edu.tw (Postfix, from userid 1000) id DDA8C5F7C2; Wed, 19 Aug 2015 12:20:36 +0800 (CST) From: Chen-Yu Tsai To: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Maxime Ripard , Greg Kroah-Hartman , Mark Brown Subject: [PATCH v3 1/8] rsb: Add generic Reduced Serial Bus (RSB) controller binding documentation Date: Wed, 19 Aug 2015 12:20:02 +0800 Message-Id: <1439958009-14056-2-git-send-email-wens@csie.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1439958009-14056-1-git-send-email-wens@csie.org> References: <1439958009-14056-1-git-send-email-wens@csie.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150818_212115_144778_3C2321C7 X-CRM114-Status: GOOD ( 13.90 ) X-Spam-Score: -4.6 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Hans de Goede , linux-sunxi@googlegroups.com, kevin.z.m.zh@gmail.com, shuge@allwinnertech.com, Chen-Yu Tsai , Meng Zhang , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Reduced Serial Bus is a proprietary 2-line push-pull serial bus supporting multiple slave devices. It was developed by Allwinner, Inc. and used by Allwinner and X-Powers, Inc. for their line of PMICs and other peripheral ICs. Signed-off-by: Chen-Yu Tsai --- Documentation/devicetree/bindings/rsb/rsb.txt | 50 +++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 Documentation/devicetree/bindings/rsb/rsb.txt diff --git a/Documentation/devicetree/bindings/rsb/rsb.txt b/Documentation/devicetree/bindings/rsb/rsb.txt new file mode 100644 index 000000000000..0b027948ca9c --- /dev/null +++ b/Documentation/devicetree/bindings/rsb/rsb.txt @@ -0,0 +1,50 @@ +Reduced Serial Bus (RSB) Controller + +This document defines a generic set of bindings for use by RSB controllers. +A controller is modelled in device tree as a node with zero or more child +nodes, each representing a unique slave device on the bus. + +Required properties: + + - #address-cells : must be 2 + - #size-cells : must be 0 + +Optional properties: + + - clock-frequency : Desired bus clock frequency in Hz. Maximum is 20 MHz. + +Child nodes: + +An RSB controller node can contain zero or more child nodes representing +slave devices on the bus. Child 'reg' properties are specified as a +runtime address, hardware address pair. The hardware address is hardwired +in the device, which can normally be found in the datasheet. The runtime +address is set by software. No 2 devices on the same bus shall have the +same runtime address. + +Valid runtime addresses - There are only 15 valid runtime addresses: + + 0x17, 0x2d, 0x3a, 0x4e, 0x59, 0x63, 0x74, 0x8b, + 0x9c, 0xa6, 0xb1, 0xc5, 0xd2, 0xe8, 0xff + +It is highly recommended that one choose the same runtime addresses as +vendor BSPs use so that a) the addresses remain the same across different +software systems, and b) addresses of supported and listed slave devices +don't conflict with unsupported or not yet listed devices. + +Example: + + rsb@... { + compatible = "..."; + reg = <...>; + /* ... */ + #address-cells = <2>; + #size-cells = <0>; + + pmic@2d { + compatible = "..."; + reg = <0x2d 0x3e3>; + + /* ... */ + }; + };