From patchwork Fri Jul 4 07:36:10 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ludovic.desroches@atmel.com X-Patchwork-Id: 367034 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 187601400B6 for ; Fri, 4 Jul 2014 17:37:01 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751391AbaGDHhA (ORCPT ); Fri, 4 Jul 2014 03:37:00 -0400 Received: from eusmtp01.atmel.com ([212.144.249.243]:44587 "EHLO eusmtp01.atmel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750987AbaGDHg7 (ORCPT ); Fri, 4 Jul 2014 03:36:59 -0400 Received: from ibiza.corp.atmel.com (10.161.101.13) by eusmtp01.atmel.com (10.161.101.31) with Microsoft SMTP Server id 14.2.347.0; Fri, 4 Jul 2014 09:36:58 +0200 From: Ludovic Desroches To: , , CC: , , , , , , , Ludovic Desroches Subject: [PATCH v2 2/2] ARM: dts: at_xdmac: add bindings documentation Date: Fri, 4 Jul 2014 09:36:10 +0200 Message-ID: <1404459370-3540-3-git-send-email-ludovic.desroches@atmel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1404459370-3540-1-git-send-email-ludovic.desroches@atmel.com> References: <1404459370-3540-1-git-send-email-ludovic.desroches@atmel.com> MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add bindings documentation for the new Atmel DMA controller (XDMAC) introduced with SAMA5D4. Signed-off-by: Ludovic Desroches --- .../devicetree/bindings/dma/atmel-xdma.txt | 39 ++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/atmel-xdma.txt diff --git a/Documentation/devicetree/bindings/dma/atmel-xdma.txt b/Documentation/devicetree/bindings/dma/atmel-xdma.txt new file mode 100644 index 0000000..1e09fda --- /dev/null +++ b/Documentation/devicetree/bindings/dma/atmel-xdma.txt @@ -0,0 +1,39 @@ +* Atmel Extensible Direct Memory Access Controller (XDMAC) + +Required properties: +- compatible: Should be "atmel,-dma". +- reg: Should contain DMA registers location and length. +- interrupts: Should contain DMA interrupt. +- #dma-cells: Must be <2>, used to represent the number of integer cells in +the dmas property of client devices. + +Example: + +dma1: dma-controller@f0004000 { + compatible = "atmel,sama5d4-dma"; + reg = <0xf0004000 0x200>; + interrupts = <50 4 0>; + #dma-cells = <2>; +}; + +DMA clients connected to the Atmel XDMA controller must use the format +described in the dma.txt file, using a three-cell specifier for each channel: +a phandle plus two integer cells. +The two cells in order are: + +1. A phandle pointing to the DMA controller. +2. The memory interface (16 most significant bits), the peripheral interface +(16 less significant bits). +3. Channel configuration register. Configurable fields are: + - bit 30-24: PERID, peripheral identifier. + +Example: + +i2c2: i2c@f8024000 { + compatible = "atmel,at91sam9x5-i2c"; + reg = <0xf8024000 0x4000>; + interrupts = <34 4 6>; + dmas = <&dma0 0x00000001 0x06000000>, + <&dma0 0x00000001 0x07000000>; + dma-names = "tx", "rx"; +};