linux-kernel - [RFC][PATCH 3/3] example: dts: hi3660-hikey960: Add dts entries to test cma heap binding

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Date:   Fri, 25 Oct 2019 22:50:09 +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 3/3] example: dts: hi3660-hikey960: Add dts entries to test cma heap binding

Adds example test entry to create and expose a 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: 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>
---
 arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts b/arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts
index 190ac29b9e2f..783c5b2abd2d 100644
--- a/arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts
+++ b/arch/arm64/boot/dts/hisilicon/hi3660-hikey960.dts
@@ -75,12 +75,23 @@
 		};
 
 		/* global autoconfigured region for contiguous allocations */
-		linux,cma {
+		cma_default: linux,cma {
 			compatible = "shared-dma-pool";
 			reg = <0x0 0x20C00000 0x0 0x4000000>;
 			reusable;
 			linux,cma-default;
 		};
+
+		cma_camera: cma-camera {
+			compatible = "shared-dma-pool";
+			reg = <0x0 0x24C00000 0x0 0x4000000>;
+			reusable;
+		};
+	};
+
+	cma_heap {
+		compatible = "dmabuf-heap-cma";
+		memory-region = <&cma_camera>;
 	};
 
 	reboot-mode-syscon@...00000 {
-- 
2.17.1