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

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Message-Id: <20200501073949.120396-2-john.stultz@linaro.org>
Date:   Fri,  1 May 2020 07:39:46 +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>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        "Andrew F. Davis" <afd@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Pratik Patel <pratikp@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        Chenbo Feng <fengc@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-mm@...ck.org
Subject: [RFC][PATCH 1/4] devicetree: bindings: Add linux,cma-heap tag for reserved memory

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@...nel.org>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: "Andrew F. Davis" <afd@...com>
Cc: Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc: Liam Mark <lmark@...eaurora.org>
Cc: Pratik Patel <pratikp@...eaurora.org>
Cc: Laura Abbott <labbott@...hat.com>
Cc: Brian Starkey <Brian.Starkey@....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: Christoph Hellwig <hch@....de>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: devicetree@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-mm@...ck.org
Signed-off-by: John Stultz <john.stultz@...aro.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.
 
-- 
2.17.1