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

Mihail Atanassov Mihail.Atanassov at arm.com
Fri Aug 2 14:40:19 UTC 2019

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 at arm.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)


 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);

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