Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752863AbdGFMVj (ORCPT ); Thu, 6 Jul 2017 08:21:39 -0400 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:11663 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752256AbdGFMVf (ORCPT ); Thu, 6 Jul 2017 08:21:35 -0400 From: Pierre-Yves MORDRET To: Vinod Koul , Rob Herring , Mark Rutland , Maxime Coquelin , Alexandre Torgue , Russell King , Dan Williams , "M'boumba Cedric Madianga" , Fabrice GASNIER , Herbert Xu , Fabien DESSENNE , Amelie Delaunay , Pierre-Yves MORDRET , , , , Subject: [PATCH v3 1/5] dt-bindings: Document the STM32 DMAMUX bindings Date: Thu, 6 Jul 2017 14:20:19 +0200 Message-ID: <1499343623-5964-2-git-send-email-pierre-yves.mordret@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1499343623-5964-1-git-send-email-pierre-yves.mordret@st.com> References: <1499343623-5964-1-git-send-email-pierre-yves.mordret@st.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.75.127.46] X-ClientProxiedBy: SFHDAG8NODE2.st.com (10.75.127.23) To SFHDAG5NODE2.st.com (10.75.127.14) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-07-06_05:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2487 Lines: 88 This patch adds the documentation of device tree bindings for the STM32 DMAMUX. Signed-off-by: M'boumba Cedric Madianga Signed-off-by: Pierre-Yves MORDRET --- Version history: v3: * change compatible to st,stm32h7-dmamux to be mode Soc specific * add verbosity in dma-cells v2: * Move clock bindings from optional to mandatory one * Drop channelID bindings as managed dynamically from now on by DMAMUX driver. --- --- .../devicetree/bindings/dma/stm32-dmamux.txt | 60 ++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/stm32-dmamux.txt diff --git a/Documentation/devicetree/bindings/dma/stm32-dmamux.txt b/Documentation/devicetree/bindings/dma/stm32-dmamux.txt new file mode 100644 index 0000000..abdb5ed --- /dev/null +++ b/Documentation/devicetree/bindings/dma/stm32-dmamux.txt @@ -0,0 +1,60 @@ +STM32 DMA MUX (DMA request router) + +Required properties: +- compatible: "st,stm32h7-dmamux" +- reg: Memory map for accessing module +- #dma-cells: Should be set to <3>. + First parameter is request line number. + Second is DMA channel configuration + Third is Fifo threshold + For more details about the three cells, please see + stm32-dma.txt documentation binding file +- dma-masters: Phandle pointing to the DMA controller + +Optional properties: +- dma-channels : Number of DMA channels supported. +- dma-requests : Number of DMA requests supported. +- resets: Reference to a reset controller asserting the DMA controller +- clocks: Input clock of the DMAMUX instance. + +Example: + +/* DMA controller */ +dma2: dma-controller@40026400 { + compatible = "st,stm32-dma"; + reg = <0x40026400 0x400>; + interrupts = <56>, + <57>, + <58>, + <59>, + <60>, + <68>, + <69>, + <70>; + clocks = <&clk_hclk>; + #dma-cells = <4>; + st,mem2mem; + resets = <&rcc 150>; + st,dmamux; + dma-channels = <8>; +}; + +/* DMA mux */ +dmamux2: dma-router@40020820 { + compatible = "st,stm32h7-dmamux"; + reg = <0x40020800 0x1c>; + #dma-cells = <3>; + dma-requests = <128>; + dma-masters = <&dma2>; +}; + +/* DMA client */ +usart1: serial@40011000 { + compatible = "st,stm32-usart", "st,stm32-uart"; + reg = <0x40011000 0x400>; + interrupts = <37>; + clocks = <&clk_pclk2>; + dmas = <&dmamux2 41 0x414 0>, + <&dmamux2 42 0x414 0>; + dma-names = "rx", "tx"; +}; -- 2.7.4