[PATCH] dma: imx-dma: Add oftree support
From: arnd@arndb.de (Arnd Bergmann)
Date: 2013-02-22 14:46:06
Also in:
linux-devicetree
On Friday 22 February 2013, Markus Pargmann wrote:
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 <redacted>
Hi Markus, Please make sure you are following the generic dma binding from Documentation/devicetree/bindings/dma/dma.txt that is getting added in Linux-3.9.
quoted hunk
+++ b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt@@ -0,0 +1,13 @@ +* Freescale Direct Memory Access (DMA) Controller for i.MX + +Required properties: +- compatible : Should be "fsl,<chip>-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: dma at 10001000 { + compatible = "fsl,imx27-dma"; + reg = <0x10001000 0x1000>; + interrupts = <32 33>; +};
In particular, the "#dma-cells" property is required here, along with dma-channels and dma-requests. You also need to describe the format of the "dmas" property in slave drivers referring to this node. In a lot of cases, you only need a single cell there, which is the request line number. Arnd