From 290ad0f9d954b445788bf26652b239c59cec2060 Mon Sep 17 00:00:00 2001 From: Markus Pargmann Date: Sun, 26 May 2013 11:53:20 +0200 Subject: dma: imx-dma: Add oftree support Adding devicetree support for imx-dma driver. Use driver name for function 'imx_dma_is_general_purpose' because the devicename for devicetree initialized devices is different. Signed-off-by: Markus Pargmann Reviewed-by: Arnd Bergmann Reviewed-by: Shawn Guo Acked-by: Sascha Hauer Signed-off-by: Vinod Koul --- .../devicetree/bindings/dma/fsl-imx-dma.txt | 48 ++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/fsl-imx-dma.txt (limited to 'Documentation/devicetree/bindings/dma') diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt new file mode 100644 index 000000000000..2717ecb47db9 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt @@ -0,0 +1,48 @@ +* Freescale Direct Memory Access (DMA) Controller for i.MX + +This document will only describe differences to the generic DMA Controller and +DMA request bindings as described in dma/dma.txt . + +* DMA controller + +Required properties: +- compatible : Should be "fsl,-dma". chip can be imx1, imx21 or imx27 +- reg : Should contain DMA registers location and length +- interrupts : First item should be DMA interrupt, second one is optional and + should contain DMA Error interrupt +- #dma-cells : Has to be 1. imx-dma does not support anything else. + +Optional properties: +- #dma-channels : Number of DMA channels supported. Should be 16. +- #dma-requests : Number of DMA requests supported. + +Example: + + dma: dma@10001000 { + compatible = "fsl,imx27-dma"; + reg = <0x10001000 0x1000>; + interrupts = <32 33>; + #dma-cells = <1>; + #dma-channels = <16>; + }; + + +* DMA client + +Clients have to specify the DMA requests with phandles in a list. + +Required properties: +- dmas: List of one or more DMA request specifiers. One DMA request specifier + consists of a phandle to the DMA controller followed by the integer + specifiying the request line. +- dma-names: List of string identifiers for the DMA requests. For the correct + names, have a look at the specific client driver. + +Example: + + sdhci1: sdhci@10013000 { + ... + dmas = <&dma 7>; + dma-names = "rx-tx"; + ... + }; -- cgit v1.2.3-59-g8ed1b