1 From bd7176b9cb91671b248fbdef0c65d2893fd78226 Mon Sep 17 00:00:00 2001
2 From: Richard Zhu <hongxing.zhu@nxp.com>
3 Date: Fri, 25 Jan 2019 18:02:22 +0800
4 Subject: [PATCH] dma: imx: add the 32bit dma limitation
6 Since the imx8qm/qxp hsio only supports up to 32bit
8 Add the 32bit dma limitation into dma binding document.
10 Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
12 Documentation/devicetree/bindings/dma/fsl-imx-dma.txt | 15 +++++++++++++++
13 1 file changed, 15 insertions(+)
15 --- a/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
16 +++ b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
17 @@ -16,6 +16,21 @@ Optional properties:
18 - #dma-channels : Number of DMA channels supported. Should be 16.
19 - #dma-requests : Number of DMA requests supported.
21 +* DMA capability limitation
23 +Specify the DMA capability limitations.
24 +For example, some SoCs only support up to 32bit DMA capability, although
27 +- only-dma-mask32: 1 means that the SoCs only suppot up to 32bit DMA
32 + compatible = "dma-capability";
33 + only-dma-mask32 = <1>;