[PATCH v2] dt-bindings: display: bridge: lt9211: Require data-lanes on DSI input ports

[PATCH v2] dt-bindings: display: bridge: lt9211: Require data-lanes on DSI input ports

[Marek Vasut]

The Lontium LT9211 is capable of 1..4 DSI lanes per input DSI port,
describe the lane count for each input port in the schema.

For example Linux kernel driver does already use that information and
fails to probe if it is missing.

Signed-off-by: Marek Vasut <marex@nabladev.com>
---
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Conor Dooley <conor+dt@kernel.org>
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: 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: Simona Vetter <simona@ffwll.ch>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: devicetree@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
---
V2: - Update commit message, indicate Linux already requires data-lanes property
    - Add required: data-lanes
---
 .../display/bridge/lontium,lt9211.yaml        | 43 ++++++++++++++++++-
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt9211.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt9211.yaml
index 9a6e9b25d14a9..7cfe92a8bcd72 100644
--- a/Documentation/devicetree/bindings/display/bridge/lontium,lt9211.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt9211.yaml
@@ -36,18 +36,56 @@ properties:
 
     properties:
       port@0:
-        $ref: /schemas/graph.yaml#/properties/port
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
         description:
           Primary MIPI DSI port-1 for MIPI input or
           LVDS port-1 for LVDS input or DPI input.
 
+        properties:
+          endpoint:
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+
+            properties:
+              data-lanes:
+                description: array of physical DSI data lane indexes.
+                minItems: 1
+                items:
+                  - const: 1
+                  - const: 2
+                  - const: 3
+                  - const: 4
+
+            required:
+              - data-lanes
+
       port@1:
-        $ref: /schemas/graph.yaml#/properties/port
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
         description:
           Additional MIPI port-2 for MIPI input or LVDS port-2
           for LVDS input. Used in combination with primary
           port-1 to drive higher resolution displays
 
+        properties:
+          endpoint:
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+
+            properties:
+              data-lanes:
+                description: array of physical DSI data lane indexes.
+                minItems: 1
+                items:
+                  - const: 1
+                  - const: 2
+                  - const: 3
+                  - const: 4
+
+            required:
+              - data-lanes
+
       port@2:
         $ref: /schemas/graph.yaml#/properties/port
         description:
@@ -99,6 +137,7 @@ examples:
             reg = <0>;
 
             endpoint {
+              data-lanes = <1 2 3 4>;
               remote-endpoint = <&dsi0_out>;
             };
           };
-- 
2.53.0

Re: [PATCH v2] dt-bindings: display: bridge: lt9211: Require data-lanes on DSI input ports

[Krzysztof Kozlowski]

On Tue, Apr 07, 2026 at 10:31:03PM +0200, Marek Vasut wrote:
> The Lontium LT9211 is capable of 1..4 DSI lanes per input DSI port,
> describe the lane count for each input port in the schema.
> 
> For example Linux kernel driver does already use that information and
> fails to probe if it is missing.
> 
> Signed-off-by: Marek Vasut <marex@nabladev.com>

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>

Best regards,
Krzysztof

Re: [PATCH v2] dt-bindings: display: bridge: lt9211: Require data-lanes on DSI input ports

[Marek Vasut]

On 4/8/26 9:35 AM, Krzysztof Kozlowski wrote:
> On Tue, Apr 07, 2026 at 10:31:03PM +0200, Marek Vasut wrote:
>> The Lontium LT9211 is capable of 1..4 DSI lanes per input DSI port,
>> describe the lane count for each input port in the schema.
>>
>> For example Linux kernel driver does already use that information and
>> fails to probe if it is missing.
>>
>> Signed-off-by: Marek Vasut <marex@nabladev.com>
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Can this be applied to drm-misc now ?

Thank you

Re: [PATCH v2] dt-bindings: display: bridge: lt9211: Require data-lanes on DSI input ports

[Marek Vasut]

On 4/8/26 9:35 AM, Krzysztof Kozlowski wrote:
> On Tue, Apr 07, 2026 at 10:31:03PM +0200, Marek Vasut wrote:
>> The Lontium LT9211 is capable of 1..4 DSI lanes per input DSI port,
>> describe the lane count for each input port in the schema.
>>
>> For example Linux kernel driver does already use that information and
>> fails to probe if it is missing.
>>
>> Signed-off-by: Marek Vasut <marex@nabladev.com>
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Can this be applied via drm-misc now ?

Re: [PATCH v2] dt-bindings: display: bridge: lt9211: Require data-lanes on DSI input ports

[Dmitry Baryshkov]

On Tue, 07 Apr 2026 22:31:03 +0200, Marek Vasut wrote:
> The Lontium LT9211 is capable of 1..4 DSI lanes per input DSI port,
> describe the lane count for each input port in the schema.
> 
> For example Linux kernel driver does already use that information and
> fails to probe if it is missing.
> 
> 
> [...]

Applied to drm-misc-next, thanks!

[1/1] dt-bindings: display: bridge: lt9211: Require data-lanes on DSI input ports
      commit: c2738d88b624a977e42a1734fad4b15993ac354a

Best regards,
-- 
With best wishes
Dmitry