Based on kernel version 6.8
. Page generated on 2024-03-11 21:26 EST
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | * 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,<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-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-channels : deprecated - dma-requests : Number of DMA requests supported. - #dma-requests : deprecated 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 specifying 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"; ... }; |