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

Commit Message

Frederic Chen Feb. 5, 2019, 6:42 a.m. UTC

From: Jungo Lin <[e-mail]>

This patch adds the DT binding documentation for the shared memory
between Pass 1 unit of the camera ISP system and the co-processor
in Mediatek SoCs.

Signed-off-by: Jungo Lin <[e-mail]>
Signed-off-by: Frederic Chen <[e-mail]>
---
 .../bindings/media/mediatek,cam_smem.txt           | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/mediatek,cam_smem.txt

Patch

diff --git a/Documentation/devicetree/bindings/media/mediatek,cam_smem.txt b/Documentation/devicetree/bindings/media/mediatek,cam_smem.txt
new file mode 100644
index 0000000..d0d9c17
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/mediatek,cam_smem.txt
@@ -0,0 +1,32 @@ 
+Mediatek Camera ISP Pass 1 Shared Memory Device
+
+Mediatek Camera ISP Pass 1 Shared Memory Device is used to manage shared
+memory among CPU, Camera ISP Pass 1 hardware and coprocessor. The Camera
+ISP Pass 1 is a hardware unit for processing image signal from the image
+sensor. Camera ISP Pass 1 is responsible for RAW processing and 3A tuning.
+
+It is associated with a reserved memory region
+(Please see Documentation\devicetree\bindings\reserved-memory\mediatek,
+reserve-memory-cam_smem.txt) and and provides the context to
+allocate memory with dma addresses.
+
+Required properties:
+- compatible: Should be "mediatek,cam_smem"
+
+- iommus: should point to the respective IOMMU block with master port
+  as argument, see Documentation/devicetree/bindings/iommu/mediatek,iommu.txt
+  for details.
+
+- mediatek,larb: must contain the local arbiters in the current SOCs, see
+  Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.txt
+  for details.
+
+Example:
+	cam_smem: cam_smem {
+		compatible = "mediatek,cam_smem";
+		mediatek,larb = <&larb3>,
+				<&larb6>;
+		iommus = <&iommu M4U_PORT_CAM_LSCI0>,
+				<&iommu M4U_PORT_CAM_LSCI1>,
+				<&iommu M4U_PORT_CAM_BPCI>;
+	};