Add a central function to parse a node according to the video
interface binding and get a media bus format.
Start with only supporting a very limited set of a few basic media
bus formats.
Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
---
drivers/gpu/drm/drm_of.c | 38 ++++++++++++++++++++++++++++++++++++++
include/drm/drm_of.h | 7 +++++++
2 files changed, 45 insertions(+)
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 4c191c050e7d..f9473edb60a7 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -212,6 +212,44 @@ int drm_of_encoder_active_endpoint(struct device_node *node,
EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
/*
+ * drm_of_media_bus_fmt - return the media bus format described in the node
+ * @node: device tree node containing the media bus format
+ *
+ * @node is presumably an of-graph endpoint node.
+ *
+ * Return the media bus format, or zero if none is described. Or one of the
+ * standard error codes.
+ */
+int drm_of_media_bus_fmt(struct device_node *node)
+{
+ s32 bus_type;
+ u32 bus_width = 0;
+
+ if (!node)
+ return -EINVAL;
+
+ if (of_property_read_u32(node, "bus-type", &bus_type))
+ return 0;
+ if (bus_type != 0)
+ return -EINVAL;
+
+ of_property_read_u32(node, "bus-width", &bus_width);
+ switch (bus_width) {
+ case 12:
+ return MEDIA_BUS_FMT_RGB444_1X12;
+ case 16:
+ return MEDIA_BUS_FMT_RGB565_1X16;
+ case 18:
+ return MEDIA_BUS_FMT_RGB666_1X18;
+ case 24:
+ return MEDIA_BUS_FMT_RGB888_1X24;
+ default:
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL_GPL(drm_of_media_bus_fmt);
+
+/*
* drm_of_find_panel_or_bridge - return connected panel or bridge device
* @np: device tree node containing encoder output ports
* @panel: pointer to hold returned drm_panel
diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
index b93c239afb60..f86f0098b21e 100644
--- a/include/drm/drm_of.h
+++ b/include/drm/drm_of.h
@@ -29,6 +29,7 @@ int drm_of_component_probe(struct device *dev,
int drm_of_encoder_active_endpoint(struct device_node *node,
struct drm_encoder *encoder,
struct of_endpoint *endpoint);
+int drm_of_media_bus_fmt(struct device_node *node);
int drm_of_find_panel_or_bridge(const struct device_node *np,
int port, int endpoint,
struct drm_panel **panel,
@@ -62,6 +63,12 @@ static inline int drm_of_encoder_active_endpoint(struct device_node *node,
{
return -EINVAL;
}
+
+static inline int drm_of_media_bus_fmt(struct device_node *node)
+{
+ return -EINVAL;
+}
+
static inline int drm_of_find_panel_or_bridge(const struct device_node *np,
int port, int endpoint,
struct drm_panel **panel,
--
2.11.0
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