linux-kernel - [PATCH] drm/komeda: Add support for 'memory-region' DT node property

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Message-ID: <20190802143951.4436-1-mihail.atanassov@arm.com>
Date:   Fri, 2 Aug 2019 14:40:19 +0000
From:   Mihail Atanassov <Mihail.Atanassov@....com>
To:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
CC:     Mihail Atanassov <Mihail.Atanassov@....com>,
        "james qian wang (Arm Technology China)" <james.qian.wang@....com>,
        Liviu Dudau <Liviu.Dudau@....com>,
        Brian Starkey <Brian.Starkey@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/komeda: Add support for 'memory-region' DT node property

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.

Signed-off-by: Mihail Atanassov <mihail.atanassov@....com>
---
 drivers/gpu/drm/arm/display/komeda/komeda_drv.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
index cfa5068d9d1e..2ec877ad260a 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
@@ -6,6 +6,7 @@
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 #include <linux/component.h>
 #include <drm/drm_of.h>
@@ -32,6 +33,7 @@ static void komeda_unbind(struct device *dev)
 return;

 komeda_kms_detach(mdrv->kms);
+of_reserved_mem_device_release(dev);
 komeda_dev_destroy(mdrv->mdev);

 dev_set_drvdata(dev, NULL);
@@ -53,6 +55,11 @@ static int komeda_bind(struct device *dev)
 goto free_mdrv;
 }

+/* Get the optional framebuffer memory resource */
+err = of_reserved_mem_device_init(dev);
+if (err && err != -ENODEV)
+goto destroy_mdev;
+
 mdrv->kms = komeda_kms_attach(mdrv->mdev);
 if (IS_ERR(mdrv->kms)) {
 err = PTR_ERR(mdrv->kms);
--
2.22.0

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