ARM: dts: msm: Add iommu coherent test device for msm8998

Added a new iommu test device which is dma-coherent. This
test device will be used for validating buffer coherency.

Change-Id: Iea1c57fd2cd5d71de2f26932d21cae8102fb918e
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>

diff --git a/arch/arm/boot/dts/qcom/msm-arm-smmu-8998.dtsi b/arch/arm/boot/dts/qcom/msm-arm-smmu-8998.dtsi
index ecfff13..da28e56 100644 (file)
--- a/arch/arm/boot/dts/qcom/msm-arm-smmu-8998.dtsi
+++ b/arch/arm/boot/dts/qcom/msm-arm-smmu-8998.dtsi
@@ -176,4 +176,16 @@
                 */
                iommus = <&mmss_smmu 42>;
        };
+
+       iommu_coherent_test_device {
+               compatible = "iommu-debug-test";
+               /*
+                * 43 shouldn't be used by anyone on the mmss_smmu.  We just
+                * need _something_ here to get this node recognized by the
+                * SMMU driver. Our test uses ATOS, which doesn't use SIDs
+                * anyways, so using a dummy value is ok.
+                */
+               iommus = <&mmss_smmu 43>;
+               dma-coherent;
+       };
 };