linux-kernel - [PATCH 17/19] media: dt-bindings: ti,ds90ub960: Add "i2c-addr" link property

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Message-Id: <20250110-ub9xx-improvements-v1-17-e0b9a1f644da@ideasonboard.com>
Date: Fri, 10 Jan 2025 11:14:17 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Devarsh Thakkar <devarsht@...com>, Jai Luthra <jai.luthra@...asonboard.com>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>, 
 devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>
Subject: [PATCH 17/19] media: dt-bindings: ti,ds90ub960: Add "i2c-addr"
 link property

From: Jai Luthra <jai.luthra@...asonboard.com>

The serializer's I2C address on the FPD-Link bus is usually communicated
to the deserializer once the forward-channel is established. But in some
cases it might be necessary to program the serializer (over the
back-channel) before the forward-channel is established.

This can be used e.g. to correct serializer configuration which
otherwise would prevent the FC to be enabled.

Add a new optional property to specify the I2C address of the
serializer.

Signed-off-by: Jai Luthra <jai.luthra@...asonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: devicetree@...r.kernel.org
Cc: Rob Herring <robh@...nel.org>
Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>
---
 Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml b/Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml
index 0b71e6f911a8..e17b508b6409 100644
--- a/Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml
@@ -75,6 +75,13 @@ properties:
               address on the I2C bus where the deserializer resides are
               forwarded to the serializer.
 
+          i2c-addr:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            description:
+              The strap I2C address of the serializer. This is used by the
+              deserializer to internally communicate to the serializer over the
+              FPD-Link back-channel.
+
           ti,rx-mode:
             $ref: /schemas/types.yaml#/definitions/uint32
             enum:

-- 
2.43.0