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From:   John Stultz <john.stultz@linaro.org>
To:     lkml <linux-kernel@vger.kernel.org>
Cc:     John Stultz <john.stultz@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        "Andrew F. Davis" <afd@ti.com>,
        Benjamin Gaignard <benjamin.gaignard@linaro.org>,
        Liam Mark <lmark@codeaurora.org>,
        Pratik Patel <pratikp@codeaurora.org>,
        Laura Abbott <labbott@redhat.com>,
        Brian Starkey <Brian.Starkey@arm.com>,
        Chenbo Feng <fengc@google.com>,
        Alistair Strachan <astrachan@google.com>,
        Sandeep Patil <sspatil@google.com>,
        Hridya Valsaraju <hridya@google.com>,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-mm@kvack.org
Subject: [RFC][PATCH 1/4] devicetree: bindings: Add linux,cma-heap tag for reserved memory
Date:   Fri,  1 May 2020 07:39:46 +0000
Message-Id: <20200501073949.120396-2-john.stultz@linaro.org>
In-Reply-To: <20200501073949.120396-1-john.stultz@linaro.org>
References: <20200501073949.120396-1-john.stultz@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@kernel.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: "Andrew F. Davis" <afd@ti.com>
Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Cc: Liam Mark <lmark@codeaurora.org>
Cc: Pratik Patel <pratikp@codeaurora.org>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Brian Starkey <Brian.Starkey@arm.com>
Cc: Chenbo Feng <fengc@google.com>
Cc: Alistair Strachan <astrachan@google.com>
Cc: Sandeep Patil <sspatil@google.com>
Cc: Hridya Valsaraju <hridya@google.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: devicetree@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-mm@kvack.org
Signed-off-by: John Stultz <john.stultz@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.
 
-- 
2.17.1