[RFC,V0,3/7,media] dt-bindings: mt8183: Added FD-SMEM dt-bindings

Commit Message

Jerry-ch Chen Feb. 20, 2019, 7:48 a.m. UTC

This patch adds the DT binding documentation for the shared memory
between Face Detection unit of the camera system and the co-processor
in Mediatek SoCs.

Signed-off-by: Jerry-ch Chen <[e-mail]>
---
 .../devicetree/bindings/media/mediatek,fd_smem.txt | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/mediatek,fd_smem.txt

Patch

diff --git a/Documentation/devicetree/bindings/media/mediatek,fd_smem.txt b/Documentation/devicetree/bindings/media/mediatek,fd_smem.txt
new file mode 100644
index 0000000..6f7c836
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/mediatek,fd_smem.txt
@@ -0,0 +1,28 @@ 
+Mediatek FD Shared Memory Device
+
+Mediatek FD Shared Memory Device is used to manage shared memory
+among CPU, FD and coprocessor. It is associated with a reserved
+memory region (Please see Documentation/devicetree/bindings/
+reserved-memory/mediatek,reserve-memory-fd_smem.txt) and
+provide the context to allocate memory with dma addresses.
+
+Required properties:
+- compatible: Shall be "mediatek,fd_smem"
+
+- iommus: Shall point to the respective IOMMU block with master port
+  as argument. Please set the ports which may be accessed
+  through the common path. You can see
+  Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
+  for the detail.
+
+- mediatek,larb: must contain the local arbiters in the current SoCs.
+  Please set the larb of imgsys for FD if you are using FD function.
+  You can see Documentation/devicetree/bindings/memory-controllers/
+  mediatek,smi-larb.txt for the detail.
+
+Example:
+	fd_smem: fd_smem {
+		compatible = "mediatek,fd_smem";
+		mediatek,larb = <&larb5>;
+		iommus = <&iommu M4U_PORT_CAM_IMGI>;
+	};