linux-kernel - [RFC][PATCH 1/3] dt-bindings: dma-buf: heaps: Describe CMA regions to be added to dmabuf heaps interface.

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Date:   Fri, 25 Oct 2019 22:50:07 +0000
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Laura Abbott <labbott@...hat.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Pratik Patel <pratikp@...eaurora.org>,
        Brian Starkey <Brian.Starkey@....com>,
        "Andrew F . Davis" <afd@...com>, Chenbo Feng <fengc@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Hridya Valsaraju <hridya@...gle.com>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: [RFC][PATCH 1/3] dt-bindings: dma-buf: heaps: Describe CMA regions to be added to dmabuf heaps interface.

This binding specifies which CMA regions should be added to the
dmabuf heaps interface.

Cc: Rob Herring <robh+dt@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Laura Abbott <labbott@...hat.com>
Cc: Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: Liam Mark <lmark@...eaurora.org>
Cc: Pratik Patel <pratikp@...eaurora.org>
Cc: Brian Starkey <Brian.Starkey@....com>
Cc: Andrew F. Davis <afd@...com>
Cc: Chenbo Feng <fengc@...gle.com>
Cc: Alistair Strachan <astrachan@...gle.com>
Cc: Sandeep Patil <sspatil@...gle.com>
Cc: Hridya Valsaraju <hridya@...gle.com>
Cc: devicetree@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 .../bindings/dma/dmabuf-heap-cma.txt          | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/dmabuf-heap-cma.txt

diff --git a/Documentation/devicetree/bindings/dma/dmabuf-heap-cma.txt b/Documentation/devicetree/bindings/dma/dmabuf-heap-cma.txt
new file mode 100644
index 000000000000..bde7b1f1c269
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/dmabuf-heap-cma.txt
@@ -0,0 +1,31 @@
+* DMA-BUF CMA Heap
+
+Specifies a CMA region that should be added to the dma-buf heaps
+interface.
+
+Required properties:
+- compatible: Must be "dmabuf-heap-cma"
+- memory-region: phandle to a CMA reserved memory node
+
+Example:
+This example has a camera CMA node in reserved memory, which is then
+referenced by the dmabuf-heap-cma node.
+
+
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+		...
+		cma_camera: cma-camera {
+			compatible = "shared-dma-pool";
+			reg = <0x0 0x24C00000 0x0 0x4000000>;
+			reusable;
+		};
+		...
+	};
+
+       cma_heap {
+               compatible = "dmabuf-heap-cma";
+               memory-region = <&cma_camera>;
+        };
-- 
2.17.1