target/linux/layerscape/patches-5.4/806-dma-0018-dma-imx-add-the-32bit-dma-limitation.patch

   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
   5
   6 Since the imx8qm/qxp hsio only supports up to 32bit
   7 dma capability.
   8 Add the 32bit dma limitation into dma binding document.
   9
  10 Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
  11 ---
  12  Documentation/devicetree/bindings/dma/fsl-imx-dma.txt | 15 +++++++++++++++
  13  1 file changed, 15 insertions(+)
  14
  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.
  20
  21 +* DMA capability limitation
  22 +
  23 +Specify the DMA capability limitations.
  24 +For example, some SoCs only support up to 32bit DMA capability, although
  25 +they are 64bit SoCs.
  26 +
  27 +- only-dma-mask32: 1 means that the SoCs only suppot up to 32bit DMA
  28 +  capability.
  29 +
  30 +Example:
  31 +       dma_cap: dma_cap {
  32 +               compatible = "dma-capability";
  33 +               only-dma-mask32 = <1>;
  34 +       };
  35 +
  36  Example:
  37
  38         dma: dma@10001000 {