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dma: imx: add the 32bit dma limitation

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Since the imx8qm/qxp hsio only supports up to 32bit
dma capability.
Add the 32bit dma limitation into dma binding document.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
This commit is contained in:
Richard Zhu 2019-01-25 18:02:22 +08:00 committed by Dong Aisheng
parent 1432768dff
commit 2432fcf604
1 changed files with 15 additions and 0 deletions
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15
Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
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@ -16,6 +16,21 @@ Optional properties:
- #dma-channels : Number of DMA channels supported. Should be 16.
- #dma-requests : Number of DMA requests supported.
* DMA capability limitation
Specify the DMA capability limitations.
For example, some SoCs only support up to 32bit DMA capability, although
they are 64bit SoCs.
- only-dma-mask32: 1 means that the SoCs only suppot up to 32bit DMA
capability.
Example:
dma_cap: dma_cap {
compatible = "dma-capability";
only-dma-mask32 = <1>;
};
Example:
dma: dma@10001000 {