linux-kernel - [RFC][PATCH 4/4] example: dts: hi3660-hikey960: Add dts entries to test cma heap binding

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Message-Id: <20200501073949.120396-5-john.stultz@linaro.org>
Date:   Fri,  1 May 2020 07:39:49 +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 4/4] example: dts: hi3660-hikey960: Add dts entries to test cma heap binding

Adds example test entry to create and expose a dummy "camera"
cma region via the dmabuf heaps interface

This isn't a patch I'm submitting to merge, but just an example
of how this functionality can be used, which I've used for
testing.

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>
---
 arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts b/arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts
index c0a6aad9593f..5eef1a76d51a 100644
--- a/arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts
+++ b/arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts
@@ -81,6 +81,13 @@
 			reusable;
 			linux,cma-default;
 		};
+
+		cma_camera: cma-camera {
+			compatible = "shared-dma-pool";
+			reg = <0x0 0x24C00000 0x0 0x4000000>;
+			reusable;
+			linux,cma-heap;
+		};
 	};
 
 	reboot-mode-syscon@...00000 {
-- 
2.17.1