[PATCH] drm: document TV margin properties

[Simon Ser]

Add docs for "{left,right,top,bottom} margin" properties.

Signed-off-by: Simon Ser <contact at emersion.fr>
Cc: Maxime Ripard <maxime at cerno.tech>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Pekka Paalanen <ppaalanen at gmail.com>
Cc: Noralf Trønnes <noralf at tronnes.org>
Cc: Mateusz Kwiatkowski <kfyatek+publicgit at gmail.com>
---
 drivers/gpu/drm/drm_connector.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 9d0250c28e9b..65a586680940 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1590,10 +1590,6 @@ EXPORT_SYMBOL(drm_connector_attach_dp_subconnector_property);
 
 /*
  * TODO: Document the properties:
- *   - left margin
- *   - right margin
- *   - top margin
- *   - bottom margin
  *   - brightness
  *   - contrast
  *   - flicker reduction
@@ -1651,6 +1647,16 @@ EXPORT_SYMBOL(drm_connector_attach_dp_subconnector_property);
  *
  *	Drivers can set up this property by calling
  *	drm_mode_create_tv_properties().
+ *
+ * left margin, right margin, top margin, bottom margin:
+ *	Add margins to the connector's viewport.
+ *
+ *	The value is the size in pixels of the black border which will be
+ *	added. The attached CRTC's content will be scaled to fill the whole
+ *	area inside the margin.
+ *
+ *	Drivers can set up these properties by calling
+ *	drm_mode_create_tv_margin_properties().
  */
 
 /**
-- 
2.39.2