[PATCH v2 2/4] video: Add of_get_display_timing

[Philipp Zabel <p.zabel@pengutronix.de>]

Add a port of the kernel of_get_display_timing() that writes a
struct fb_videomode instead of struct display_timing, which we
don't have.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/video/of_display_timing.c | 22 ++++++++++++++++++++++
 include/fb.h                      |  2 ++
 2 files changed, 24 insertions(+)

diff --git a/drivers/video/of_display_timing.c b/drivers/video/of_display_timing.c
index 6fe1e1b08b6a..6082d454932d 100644
--- a/drivers/video/of_display_timing.c
+++ b/drivers/video/of_display_timing.c
@@ -98,6 +98,28 @@ static int of_parse_display_timing(const struct device_node *np,
 	return 0;
 }
 
+/**
+ * of_get_display_timing - parse a display_timing entry
+ * @np: device_node with the timing subnode
+ * @name: name of the timing node
+ * @mode: fb_videomode struct to fill
+ **/
+int of_get_display_timing(const struct device_node *np, const char *name,
+			  struct fb_videomode *mode)
+{
+	struct device_node *timing_np;
+
+	if (!np)
+		return -EINVAL;
+
+	timing_np = of_get_child_by_name(np, name);
+	if (!timing_np)
+		return -ENOENT;
+
+	return of_parse_display_timing(timing_np, mode);
+}
+EXPORT_SYMBOL_GPL(of_get_display_timing);
+
 /**
  * of_get_display_timings - parse all display_timing entries from a device_node
  * @np: device_node with the subnodes
diff --git a/include/fb.h b/include/fb.h
index bf5f688342fd..15bb74b99576 100644
--- a/include/fb.h
+++ b/include/fb.h
@@ -147,6 +147,8 @@ struct fb_info {
 	int shadowfb;
 };
 
+int of_get_display_timing(const struct device_node *np, const char *name,
+			  struct fb_videomode *mode);
 struct display_timings *of_get_display_timings(struct device_node *np);
 void display_timings_release(struct display_timings *);
 
-- 
2.39.2