[PATCH v3 1/2] dt-bindings: display: bridge: ldb: Document nxp,enable-termination-resistor

[Fabio Estevam <festevam@gmail.com>]

From: Fabio Estevam <festevam@nabladev.com>

Document the optional nxp,enable-termination-resistor property for the
i.MX LVDS display bridge.

This boolean property indicates that the built-in 100 Ohm termination
resistor on the LVDS output is enabled. It is controlled via the HS_EN
bit in the LVDS_CTRL register. Enabling the resistor can improve LVDS
signal quality and may prevent visual artifacts on some boards, but
increases the power consumption.

Signed-off-by: Fabio Estevam <festevam@nabladev.com>
---
Changes since v1:
- Restrict it to i.MX6SX. (Liu Ying)

 .../bindings/display/bridge/fsl,ldb.yaml       | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
index 49664101a353..7f380879fffd 100644
--- a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
+++ b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
@@ -35,6 +35,15 @@ properties:
       - const: ldb
       - const: lvds
 
+  nxp,enable-termination-resistor:
+    type: boolean
+    description:
+      Indicates that the built-in 100 Ohm termination resistor on the LVDS
+      output is enabled. This property is optional and controlled via the
+      HS_EN bit in the LVDS_CTRL register. Enabling it can improve signal
+      quality and prevent visual artifacts on some boards, but increases
+      power consumption.
+
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
 
@@ -84,6 +93,15 @@ allOf:
       required:
         - reg-names
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: fsl,imx6sx-ldb
+    then:
+      properties:
+        nxp,enable-termination-resistor: false
+
 additionalProperties: false
 
 examples:
-- 
2.34.1