From patchwork Mon Jun 30 13:20:53 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 4450221 X-Patchwork-Delegate: vinod.koul@intel.com Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 9EA92BEEAA for ; Mon, 30 Jun 2014 13:30:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9457820328 for ; Mon, 30 Jun 2014 13:30:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A4B1020225 for ; Mon, 30 Jun 2014 13:30:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751476AbaF3NaV (ORCPT ); Mon, 30 Jun 2014 09:30:21 -0400 Received: from top.free-electrons.com ([176.31.233.9]:54727 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751001AbaF3NaU (ORCPT ); Mon, 30 Jun 2014 09:30:20 -0400 Received: by mail.free-electrons.com (Postfix, from userid 106) id 261662705; Mon, 30 Jun 2014 15:30:24 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from localhost (col31-4-88-188-83-94.fbx.proxad.net [88.188.83.94]) by mail.free-electrons.com (Postfix) with ESMTPSA id DF8DC87B; Mon, 30 Jun 2014 15:25:07 +0200 (CEST) From: Maxime Ripard To: Dan Williams , Vinod Koul Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@googlegroups.com, kevin.z.m.zh@gmail.com, sunny@allwinnertech.com, shuge@allwinnertech.com, zhuzhenhua@allwinnertech.com, Arnd Bergmann , andriy.shevchenko@intel.com, dmaengine@vger.kernel.org, Maxime Ripard Subject: [PATCH v10 1/2] Documentation: dt: Add Allwinner A31 DMA controller bindings Date: Mon, 30 Jun 2014 15:20:53 +0200 Message-Id: <1404134454-25513-2-git-send-email-maxime.ripard@free-electrons.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1404134454-25513-1-git-send-email-maxime.ripard@free-electrons.com> References: <1404134454-25513-1-git-send-email-maxime.ripard@free-electrons.com> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The Allwinner A31 DMA controller is rather simple to describe in the DT. Add the bindings documentation. Signed-off-by: Maxime Ripard --- .../devicetree/bindings/dma/sun6i-dma.txt | 45 ++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/sun6i-dma.txt diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt new file mode 100644 index 000000000000..3e145c1675b1 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt @@ -0,0 +1,45 @@ +Allwinner A31 DMA Controller + +This driver follows the generic DMA bindings defined in dma.txt. + +Required properties: + +- compatible: Must be "allwinner,sun6i-a31-dma" +- reg: Should contain the registers base address and length +- interrupts: Should contain a reference to the interrupt used by this device +- clocks: Should contain a reference to the parent AHB clock +- resets: Should contain a reference to the reset controller asserting + this device in reset +- #dma-cells : Should be 1, a single cell holding a line request number + +Example: + dma: dma-controller@01c02000 { + compatible = "allwinner,sun6i-a31-dma"; + reg = <0x01c02000 0x1000>; + interrupts = <0 50 4>; + clocks = <&ahb1_gates 6>; + resets = <&ahb1_rst 6>; + #dma-cells = <1>; + }; + +Clients: + +DMA clients connected to the A31 DMA controller must use the format +described in the dma.txt file, using a two-cell specifier for each +channel: a phandle plus one integer cells. +The two cells in order are: + +1. A phandle pointing to the DMA controller. +2. The port ID as specified in the datasheet + +Example: +spi2: spi@01c6a000 { + compatible = "allwinner,sun6i-a31-spi"; + reg = <0x01c6a000 0x1000>; + interrupts = <0 67 4>; + clocks = <&ahb1_gates 22>, <&spi2_clk>; + clock-names = "ahb", "mod"; + dmas = <&dma 25>, <&dma 25>; + dma-names = "rx", "tx"; + resets = <&ahb1_rst 22>; +};