This patch adds the DT binding documentation for the shared memory
between DIP (Digital Image Processing) unit of the camera ISP system
and the co-processor in Mediatek SoCs.
Signed-off-by: Frederic Chen <frederic.chen@xxxxxxxxxxxx>
---
.../bindings/media/mediatek,dip_smem.txt | 29 ++++++++++++++++++++++
1 file changed, 29 insertions(+)
create mode 100644 Documentation/devicetree/bindings/media/mediatek,dip_smem.txt
diff --git a/Documentation/devicetree/bindings/media/mediatek,dip_smem.txt b/Documentation/devicetree/bindings/media/mediatek,dip_smem.txt
new file mode 100644
index 0000000..5533721
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/mediatek,dip_smem.txt
@@ -0,0 +1,29 @@
+Mediatek ISP Shared Memory Device
+
+Mediatek ISP Shared Memory Device is used to manage shared memory
+among CPU, ISP IPs and coprocessor. It is associated with a reserved
+memory region (Please see Documentation\devicetree\bindings\
+reserved-memory\mediatek,reserve-memory-isp_smem.txt) and
+and provide the context to allocate memory with dma addresses.
+
+Required properties:
+- compatible: Should be "mediatek,isp_smem"
+
+- iommus: should 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 camsys for Pass 1 and imgsys for DIP, or both
+ if you are using all the camera function. You can see
+ Documentation/devicetree/bindings/memory-controllers/
+ mediatek,smi-larb.txt for the detail.
+
+Example:
+ isp_smem: isp_smem {
+ compatible = "mediatek,isp_smem";
+ mediatek,larb = <&larb5>;
+ iommus = <&iommu M4U_PORT_CAM_IMGI>;
+ };
--
1.9.1
