Commit cb028e49 authored by Douglas Anderson's avatar Douglas Anderson Committed by Sean Paul

dt-bindings: drm/panel: simple: Add no-hpd property

Some eDP panels that are designed to be always connected to a board
use their HPD signal to signal that they've finished powering on and
they're ready to be talked to.

However, for various reasons it's possible that the HPD signal from
the panel isn't actually hooked up.  In the case where the HPD isn't
hooked up you can look at the timing diagram on the panel datasheet
and insert a delay for the maximum amount of time that the HPD might
take to come up.

Let's add a property in the device tree for this concept.
Reviewed-by: default avatarSean Paul <>
Reviewed-by: default avatarRob Herring <>
Signed-off-by: default avatarDouglas Anderson <>
Signed-off-by: default avatarSean Paul <>
parent 922dceff
......@@ -11,6 +11,9 @@ Optional properties:
- ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
- enable-gpios: GPIO pin to enable or disable the panel
- backlight: phandle of the backlight device attached to the panel
- no-hpd: This panel is supposed to communicate that it's ready via HPD
(hot plug detect) signal, but the signal isn't hooked up so we should
hardcode the max delay from the panel spec when powering up the panel.
Markdown is supported
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment