Add dma-channel-mask binding doc support to nvidia,tegra210-adma
to reserve the adma channel usage

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mohan Kumar <mkumard@nvidia.com>
---
 .../devicetree/bindings/dma/nvidia,tegra210-adma.yaml          | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra210-adma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra210-adma.yaml
index 4003dbe94940..877147e95ecc 100644
--- a/Documentation/devicetree/bindings/dma/nvidia,tegra210-adma.yaml
+++ b/Documentation/devicetree/bindings/dma/nvidia,tegra210-adma.yaml
@@ -53,6 +53,9 @@ properties:
       ADMA_CHn_CTRL register.
     const: 1
 
+  dma-channel-mask:
+    maxItems: 1
+
 required:
   - compatible
   - reg
-- 
2.17.1