[PATCH v2 1/2] dt-bindings: display: bridge: tc358867: Document default DP preemphasis

Marek Vasut
2024-06-21T15:54:54Z

Document default DP port preemphasis configurable via new DT property
"toshiba,pre-emphasis". This is useful in case the DP link properties
are known and starting link training from preemphasis setting of 0 dB
is not useful. The preemphasis can be set separately for both DP lanes
in range 0=0dB, 1=3.5dB, 2=6dB .

Signed-off-by: Marek Vasut <marex@denx.de>
---
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@gmail.com>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Neil Armstrong <neil.armstrong@linaro.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Robert Foss <rfoss@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: devicetree@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: kernel@dh-electronics.com
---
V2: - Fix the type to u8 array
- Fix the enum items to match what they represent
---
.../display/bridge/toshiba,tc358767.yaml | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358767.yaml b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358767.yaml
index 2ad0cd6dd49e0..6287eb2b40908 100644
--- a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358767.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358767.yaml
@@ -98,6 +98,24 @@ properties:
reference to a valid eDP panel input endpoint node. This port is
optional, treated as DP panel if not defined

+ properties:
+ endpoint:
+ $ref: /schemas/media/video-interfaces.yaml#
+ unevaluatedProperties: false
+
+ properties:
+ toshiba,pre-emphasis:
+ description:
+ Display port output Pre-Emphasis settings for both ports.
+ $ref: /schemas/types.yaml#/definitions/uint8-array
+ minItems: 2
+ maxItems: 2
+ items:
+ enum:
+ - 0 # No pre-emphasis
+ - 1 # 3.5dB pre-emphasis
+ - 2 # 6dB pre-emphasis
+
oneOf:
- required:
- port@0
--
2.43.0