[PATCH v2] drm/komeda: Add support for 'memory-region' DT node property

[Mihail Atanassov]

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 at 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;
 }

+/* Get the optional framebuffer memory resource */
+ret = of_reserved_mem_device_init(dev);
+if (ret && ret != -ENODEV)
+return ret;
+ret = 0;
+
 for_each_available_child_of_node(np, child) {
 if (of_node_cmp(child->name, "pipeline") == 0) {
 ret = komeda_parse_pipe_dt(mdev, child);
@@ -292,6 +299,8 @@ void komeda_dev_destroy(struct komeda_dev *mdev)

 mdev->n_pipelines = 0;

+of_reserved_mem_device_release(dev);
+
 if (funcs && funcs->cleanup)
 funcs->cleanup(mdev);

--
2.22.0

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