[PATCH v7 1/3] dt-bindings: drm/bridge: ti-sn65dsi83: Add properties for ti,lvds-vod-swing

Andrej Picej
2024-12-16T08:55:07Z

Add properties which can be used to specify LVDS differential output
voltage. Since this also depends on near-end signal termination also
include property which sets this. LVDS differential output voltage is
specified with an array (min, max), which should match the one from
connected device.

Signed-off-by: Andrej Picej <andrej.picej@norik.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
Changes in v7:
- no change
Changes in v6:
- no change
Changes in v5:
- added Krzysztof's reviewed-by tag
Changes in v4:
- removed "additionalProperties: true" from the patch as it is not needed
Changes in v3:
- no change
Changes in v2:
- move LVDS port schema to a $defs and reference it from there
- properties are now defined in microvolts/ohms
- use 1 property for data-lane and 1 for clock-lane LVDS voltage swing
- add 1 property which sets LVDS near-end termination
- since major change was done change the authorship to myself
---
.../bindings/display/bridge/ti,sn65dsi83.yaml | 34 +++++++++++++++++--
1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
index 48a97bb3e2e0..bad6f5c81b06 100644
--- a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
@@ -80,12 +80,12 @@ properties:
- const: 4

port@2:
- $ref: /schemas/graph.yaml#/properties/port
description: Video port for LVDS Channel-A output (panel or bridge).
+ $ref: '#/$defs/lvds-port'

port@3:
- $ref: /schemas/graph.yaml#/properties/port
description: Video port for LVDS Channel-B output (panel or bridge).
+ $ref: '#/$defs/lvds-port'

required:
- port@0
@@ -96,6 +96,36 @@ required:
- reg
- ports

+$defs:
+ lvds-port:
+ $ref: /schemas/graph.yaml#/$defs/port-base
+ unevaluatedProperties: false
+
+ properties:
+ endpoint:
+ $ref: /schemas/media/video-interfaces.yaml#
+ unevaluatedProperties: false
+
+ properties:
+ ti,lvds-termination-ohms:
+ description: The value of near end differential termination in ohms.
+ enum: [100, 200]
+ default: 200
+
+ ti,lvds-vod-swing-clock-microvolt:
+ description: LVDS diferential output voltage <min max> for clock
+ lanes in microvolts.
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ minItems: 2
+ maxItems: 2
+
+ ti,lvds-vod-swing-data-microvolt:
+ description: LVDS diferential output voltage <min max> for data
+ lanes in microvolts.
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ minItems: 2
+ maxItems: 2
+
allOf:
- if:
properties:
--
2.34.1