diff options
Diffstat (limited to 'target/linux/layerscape/patches-5.4/806-dma-0018-dma-imx-add-the-32bit-dma-limitation.patch')
| -rw-r--r-- | target/linux/layerscape/patches-5.4/806-dma-0018-dma-imx-add-the-32bit-dma-limitation.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/806-dma-0018-dma-imx-add-the-32bit-dma-limitation.patch b/target/linux/layerscape/patches-5.4/806-dma-0018-dma-imx-add-the-32bit-dma-limitation.patch new file mode 100644 index 0000000000..7c1f4f94cd --- /dev/null +++ b/target/linux/layerscape/patches-5.4/806-dma-0018-dma-imx-add-the-32bit-dma-limitation.patch @@ -0,0 +1,38 @@ +From bd7176b9cb91671b248fbdef0c65d2893fd78226 Mon Sep 17 00:00:00 2001 +From: Richard Zhu <hongxing.zhu@nxp.com> +Date: Fri, 25 Jan 2019 18:02:22 +0800 +Subject: [PATCH] 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> +--- + Documentation/devicetree/bindings/dma/fsl-imx-dma.txt | 15 +++++++++++++++ + 1 file changed, 15 insertions(+) + +--- 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 { |