[PATCH 4/4] dma-heap: Devicetree binding for chunk heap

[Minchan Kim <minchan@kernel.org>]

From: Hyesoo Yu <hyesoo.yu@samsung.com>

Document devicetree binding for chunk heap on dma heap framework

Signed-off-by: Hyesoo Yu <hyesoo.yu@samsung.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
 .../bindings/dma-buf/chunk_heap.yaml          | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma-buf/chunk_heap.yaml

diff --git a/Documentation/devicetree/bindings/dma-buf/chunk_heap.yaml b/Documentation/devicetree/bindings/dma-buf/chunk_heap.yaml
new file mode 100644
index 000000000000..f382bee02778
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma-buf/chunk_heap.yaml
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma-buf/chunk_heap.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Device tree binding for chunk heap on DMA HEAP FRAMEWORK
+
+maintainers:
+  - Sumit Semwal <sumit.semwal@linaro.org>
+
+description: |
+  The chunk heap is backed by the Contiguous Memory Allocator (CMA) and
+  allocates the buffers that are made up to a list of fixed size chunks
+  taken from CMA. Chunk sizes are configurated when the heaps are created.
+
+properties:
+  compatible:
+    enum:
+      - dma_heap,chunk
+
+  memory-region:
+    maxItems: 1
+
+  alignment:
+    maxItems: 1
+
+required:
+  - compatible
+  - memory-region
+  - alignment
+
+additionalProperties: false
+
+examples:
+  - |
+    reserved-memory {
+        #address-cells = <2>;
+        #size-cells = <1>;
+
+        chunk_memory: chunk_memory {
+            compatible = "shared-dma-pool";
+            reusable;
+            size = <0x10000000>;
+        };
+    };
+
+    chunk_default_heap: chunk_default_heap {
+        compatible = "dma_heap,chunk";
+        memory-region = <&chunk_memory>;
+        alignment = <0x10000>;
+    };
-- 
2.29.2.299.gdc1121823c-goog