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From:   Mihail Atanassov <Mihail.Atanassov@arm.com>
To:     "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>
CC:     nd <nd@arm.com>, Mihail Atanassov <Mihail.Atanassov@arm.com>,
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        Liviu Dudau <Liviu.Dudau@arm.com>,
        Brian Starkey <Brian.Starkey@arm.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH v2.1] drm/komeda: Add support for 'memory-region' DT node
 property
Thread-Topic: [PATCH v2.1] drm/komeda: Add support for 'memory-region' DT node
 property
Thread-Index: AQHVS3QL8/BEL0aPM0GZk8WnOetY0A==
Date:   Mon, 5 Aug 2019 09:56:25 +0000
Message-ID: <20190805095408.21285-1-mihail.atanassov@arm.com>
References: <20190802143951.4436-1-mihail.atanassov@arm.com>
In-Reply-To: <20190802143951.4436-1-mihail.atanassov@arm.com>
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The 'memory-region' property of the komeda display driver DT binding
allows the use of a 'reserved-memory' node for buffer allocations. Add
the requisite of_reserved_mem_device_{init,release} calls to actually
make use of the memory if present.

Changes since v1:
 - Move handling inside komeda_parse_dt

Signed-off-by: Mihail Atanassov <mihail.atanassov@arm.com>
---
 drivers/gpu/drm/arm/display/komeda/komeda_dev.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c b/drivers/gpu/=
drm/arm/display/komeda/komeda_dev.c
index 1ff7f4b2c620..0142ee991957 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
@@ -8,6 +8,7 @@
 #include <linux/iommu.h>
 #include <linux/of_device.h>
 #include <linux/of_graph.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #ifdef CONFIG_DEBUG_FS
@@ -146,6 +147,12 @@ static int komeda_parse_dt(struct device *dev, struct =
komeda_dev *mdev)
 		return mdev->irq;
 	}
=20
+	/* Get the optional framebuffer memory resource */
+	ret =3D of_reserved_mem_device_init(dev);
+	if (ret && ret !=3D -ENODEV)
+		return ret;
+	ret =3D 0;
+
 	for_each_available_child_of_node(np, child) {
 		if (of_node_cmp(child->name, "pipeline") =3D=3D 0) {
 			ret =3D komeda_parse_pipe_dt(mdev, child);
@@ -292,6 +299,8 @@ void komeda_dev_destroy(struct komeda_dev *mdev)
=20
 	mdev->n_pipelines =3D 0;
=20
+	of_reserved_mem_device_release(dev);
+
 	if (funcs && funcs->cleanup)
 		funcs->cleanup(mdev);
=20
--=20
2.22.0