linux-kernel - [PATCH 3/3] dma-heap: Devicetree binding for chunk heap

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Message-Id: <20200818080415.7531-4-hyesoo.yu@samsung.com>
Date:   Tue, 18 Aug 2020 17:04:15 +0900
From:   Hyesoo Yu <hyesoo.yu@...sung.com>
To:     sumit.semwal@...aro.org
Cc:     minchan@...nel.org, akpm@...ux-foundation.org,
        iamjoonsoo.kim@....com, joaodias@...gle.com, linux-mm@...ck.org,
        pullip.cho@...sung.com, surenb@...gle.com, vbabka@...e.cz,
        afd@...com, benjamin.gaignard@...aro.org, lmark@...eaurora.org,
        labbott@...hat.com, Brian.Starkey@....com, john.stultz@...aro.org,
        christian.koenig@....com, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, Hyesoo Yu <hyesoo.yu@...sung.com>
Subject: [PATCH 3/3] dma-heap: Devicetree binding for chunk heap

Document devicetree binding for chunk heap on dma heap framework

Signed-off-by: Hyesoo Yu <hyesoo.yu@...sung.com>
---
 .../devicetree/bindings/dma-buf/chunk_heap.yaml    | 46 ++++++++++++++++++++++
 1 file changed, 46 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 0000000..1ee8fad
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma-buf/chunk_heap.yaml
@@ -0,0 +1,46 @@
+# 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@...aro.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
+
+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>;
+    };
-- 
2.7.4