Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751585AbdIQDUN (ORCPT ); Sat, 16 Sep 2017 23:20:13 -0400 Received: from mail-out-1.itc.rwth-aachen.de ([134.130.5.46]:15335 "EHLO mail-out-1.itc.rwth-aachen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751370AbdIQDUL (ORCPT ); Sat, 16 Sep 2017 23:20:11 -0400 X-IronPort-AV: E=Sophos;i="5.42,405,1500933600"; d="scan'208";a="13708894" From: =?UTF-8?q?Stefan=20Br=C3=BCns?= To: CC: , , Vinod Koul , , , Maxime Ripard , Chen-Yu Tsai , Rob Herring , Code Kipper , Andre Przywara Subject: [PATCH v2 06/10] arm64: allwinner: a64: Add devicetree binding for DMA controller Date: Sun, 17 Sep 2017 05:19:52 +0200 Message-ID: <20170917031956.28010-7-stefan.bruens@rwth-aachen.de> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170917031956.28010-1-stefan.bruens@rwth-aachen.de> References: <20170917031956.28010-1-stefan.bruens@rwth-aachen.de> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [85.183.223.53] X-ClientProxiedBy: rwthex-w1-b.rwth-ad.de (2002:8682:1a9d::8682:1a9d) To rwthex-w1-a.rwth-ad.de (2002:8682:1a9c::8682:1a9c) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1858 Lines: 53 The A64 is register compatible with the H3, but has a different number of dma channels and request ports. Attach additional properties to the node to allow future reuse of the compatible for controllers with different number of channels/requests. If dma-requests is not specified, the register layout defined maximum of 32 is used. Signed-off-by: Stefan Brüns --- .../devicetree/bindings/dma/sun6i-dma.txt | 26 ++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt index 98fbe1a5c6dd..6ebc79f95202 100644 --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt @@ -27,6 +27,32 @@ Example: #dma-cells = <1>; }; +------------------------------------------------------------------------------ +For A64 DMA controller: + +Required properties: +- compatible: "allwinner,sun50i-a64-dma" +- dma-channels: Number of DMA channels supported by the controller. + Refer to Documentation/devicetree/bindings/dma/dma.txt +- all properties above, i.e. reg, interrupts, clocks, resets and #dma-cells + +Optional properties: +- dma-requests: Number of DMA request signals supported by the controller. + Refer to Documentation/devicetree/bindings/dma/dma.txt + +Example: + dma: dma-controller@01c02000 { + compatible = "allwinner,sun50i-a64-dma"; + reg = <0x01c02000 0x1000>; + interrupts = ; + clocks = <&ccu CLK_BUS_DMA>; + dma-channels = <8>; + dma-requests = <27>; + resets = <&ccu RST_BUS_DMA>; + #dma-cells = <1>; + }; +------------------------------------------------------------------------------ + Clients: DMA clients connected to the A31 DMA controller must use the format -- 2.14.1