From bd7176b9cb91671b248fbdef0c65d2893fd78226 Mon Sep 17 00:00:00 2001 From: Richard Zhu 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 --- 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 {