From mboxrd@z Thu Jan 1 00:00:00 1970 From: ludovic.desroches@atmel.com (Ludovic Desroches) Date: Fri, 4 Jul 2014 09:36:10 +0200 Subject: [PATCH v2 2/2] ARM: dts: at_xdmac: add bindings documentation In-Reply-To: <1404459370-3540-1-git-send-email-ludovic.desroches@atmel.com> References: <1404459370-3540-1-git-send-email-ludovic.desroches@atmel.com> Message-ID: <1404459370-3540-3-git-send-email-ludovic.desroches@atmel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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 at 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 at f8024000 { + compatible = "atmel,at91sam9x5-i2c"; + reg = <0xf8024000 0x4000>; + interrupts = <34 4 6>; + dmas = <&dma0 0x00000001 0x06000000>, + <&dma0 0x00000001 0x07000000>; + dma-names = "tx", "rx"; +}; -- 1.7.9.5