[PATCH v3 3/4] dt-bindings: reserved-memory: Make DMA-BUF CMA heap DT-configurable

Minchan Kim
2021-01-13T01:22:03Z

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

Document devicetree binding for chunk cma heap on dma heap framework.

The DMA chunk heap supports the bulk allocation of higher order pages.

Signed-off-by: Hyesoo Yu <hyesoo.yu@samsung.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Hridya Valsaraju <hridya@google.com>
Change-Id: I8fb231e5a8360e2d8f65947e155b12aa664dde01
---
.../reserved-memory/dma_heap_chunk.yaml | 58 +++++++++++++++++++
1 file changed, 58 insertions(+)
create mode 100644 Documentation/devicetree/bindings/reserved-memory/dma_heap_chunk.yaml

diff --git a/Documentation/devicetree/bindings/reserved-memory/dma_heap_chunk.yaml b/Documentation/devicetree/bindings/reserved-memory/dma_heap_chunk.yaml
new file mode 100644
index 000000000000..3e7fed5fb006
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/dma_heap_chunk.yaml
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reserved-memory/dma_heap_chunk.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Device tree binding for chunk heap on DMA HEAP FRAMEWORK
+
+description: |
+ The DMA chunk heap is backed by the Contiguous Memory Allocator (CMA) and
+ supports bulk allocation of fixed size pages.
+
+maintainers:
+ - Hyesoo Yu <hyesoo.yu@samsung.com>
+ - John Stultz <john.stultz@linaro.org>
+ - Minchan Kim <minchan@kernel.org>
+ - Hridya Valsaraju<hridya@google.com>
+
+
+properties:
+ compatible:
+ enum:
+ - dma_heap,chunk
+
+ chunk-order:
+ description: |
+ order of pages that will get allocated from the chunk DMA heap.
+ maxItems: 1
+
+ size:
+ maxItems: 1
+
+ alignment:
+ maxItems: 1
+
+required:
+ - compatible
+ - size
+ - alignment
+ - chunk-order
+
+additionalProperties: false
+
+examples:
+ - |
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <1>;
+
+ chunk_memory: chunk_memory {
+ compatible = "dma_heap,chunk";
+ size = <0x3000000>;
+ alignment = <0x0 0x00010000>;
+ chunk-order = <4>;
+ };
+ };
+
+
--
2.30.0.284.gd98b1dd5eaa7-goog