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

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Date:   Tue, 12 Jan 2021 17:21:42 -0800
From:   Minchan Kim <minchan@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        hyesoo.yu@...sung.com, david@...hat.com, mhocko@...e.com,
        surenb@...gle.com, pullip.cho@...sung.com, joaodias@...gle.com,
        hridya@...gle.com, john.stultz@...aro.org, sumit.semwal@...aro.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        hch@...radead.org, robh+dt@...nel.org,
        linaro-mm-sig@...ts.linaro.org, Minchan Kim <minchan@...nel.org>
Subject: [PATCH v3 3/4] dt-bindings: reserved-memory: Make DMA-BUF CMA heap DT-configurable

From: Hyesoo Yu <hyesoo.yu@...sung.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@...sung.com>
Signed-off-by: Minchan Kim <minchan@...nel.org>
Signed-off-by: Hridya Valsaraju <hridya@...gle.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@...sung.com>
+  - John Stultz <john.stultz@...aro.org>
+  - Minchan Kim <minchan@...nel.org>
+  - Hridya Valsaraju<hridya@...gle.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