Add iommus binding for DMA mode support

Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
v2 -> v3:
- modified commit message
---
 Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml
index ee8f7ea..1696ac4 100644
--- a/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml
+++ b/Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml
@@ -29,6 +29,9 @@ properties:
   reg:
     maxItems: 1
 
+  iommus:
+    maxItems: 1
+
   interrupts:
     maxItems: 1
 
-- 
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