[RFC][PATCH 1/4] devicetree: bindings: Add linux, cma-heap tag for reserved memory

John Stultz john.stultz at linaro.org
Fri May 1 07:39:46 UTC 2020

This patch adds a linux,cma-heap property for CMA reserved memory
regions, which will be used to allow the region to be exposed via
the DMA-BUF Heaps interface

Cc: Rob Herring <robh+dt at kernel.org>
Cc: Sumit Semwal <sumit.semwal at linaro.org>
Cc: "Andrew F. Davis" <afd at ti.com>
Cc: Benjamin Gaignard <benjamin.gaignard at linaro.org>
Cc: Liam Mark <lmark at codeaurora.org>
Cc: Pratik Patel <pratikp at codeaurora.org>
Cc: Laura Abbott <labbott at redhat.com>
Cc: Brian Starkey <Brian.Starkey at arm.com>
Cc: Chenbo Feng <fengc at google.com>
Cc: Alistair Strachan <astrachan at google.com>
Cc: Sandeep Patil <sspatil at google.com>
Cc: Hridya Valsaraju <hridya at google.com>
Cc: Christoph Hellwig <hch at lst.de>
Cc: Marek Szyprowski <m.szyprowski at samsung.com>
Cc: Robin Murphy <robin.murphy at arm.com>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: devicetree at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Cc: linux-mm at kvack.org
Signed-off-by: John Stultz <john.stultz at linaro.org>
 .../devicetree/bindings/reserved-memory/reserved-memory.txt    | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt b/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
index bac4afa3b197..e97b6a4c3bc0 100644
--- a/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
+++ b/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
@@ -68,6 +68,9 @@ Linux implementation note:
 - If a "linux,cma-default" property is present, then Linux will use the
   region for the default pool of the contiguous memory allocator.
+- If a "linux,cma-heap" property is present, then Linux will expose the
+  the CMA region via the DMA-BUF Heaps interface.
 - If a "linux,dma-default" property is present, then Linux will use the
   region for the default pool of the consistent DMA allocator.

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