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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 {
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