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39 lines
1.1 KiB
Diff
39 lines
1.1 KiB
Diff
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From bd7176b9cb91671b248fbdef0c65d2893fd78226 Mon Sep 17 00:00:00 2001
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From: Richard Zhu <hongxing.zhu@nxp.com>
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Date: Fri, 25 Jan 2019 18:02:22 +0800
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Subject: [PATCH] dma: imx: add the 32bit dma limitation
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Since the imx8qm/qxp hsio only supports up to 32bit
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dma capability.
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Add the 32bit dma limitation into dma binding document.
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Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
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---
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Documentation/devicetree/bindings/dma/fsl-imx-dma.txt | 15 +++++++++++++++
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1 file changed, 15 insertions(+)
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--- a/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
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+++ b/Documentation/devicetree/bindings/dma/fsl-imx-dma.txt
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@@ -16,6 +16,21 @@ Optional properties:
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- #dma-channels : Number of DMA channels supported. Should be 16.
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- #dma-requests : Number of DMA requests supported.
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+* DMA capability limitation
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+
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+Specify the DMA capability limitations.
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+For example, some SoCs only support up to 32bit DMA capability, although
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+they are 64bit SoCs.
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+
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+- only-dma-mask32: 1 means that the SoCs only suppot up to 32bit DMA
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+ capability.
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+
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+Example:
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+ dma_cap: dma_cap {
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+ compatible = "dma-capability";
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+ only-dma-mask32 = <1>;
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+ };
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+
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Example:
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dma: dma@10001000 {
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