diff options
| author | Richard Zhu <hongxing.zhu@nxp.com> | 2019-01-25 18:02:22 +0800 |
|---|---|---|
| committer | Dong Aisheng <aisheng.dong@nxp.com> | 2019-11-25 16:03:19 +0800 |
| commit | 2432fcf6040eee05fa8eed8d9a31723f297a9624 (patch) | |
| tree | d1a09377e95271c5adbea1316d6ac148ac4d34ba /Documentation/devicetree/bindings/dma | |
| parent | 1432768dff266a12b65fe00b1e3d4d12cd1a746a (diff) | |
dma: imx: add the 32bit dma limitation
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>
Diffstat (limited to 'Documentation/devicetree/bindings/dma')
| -rw-r--r-- | Documentation/devicetree/bindings/dma/fsl-imx-dma.txt | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt index 7bd8847d6394..d10a9c1d2ce6 100644 --- a/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt +++ b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt @@ -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 { |