linux-kernel - [PATCH v4 09/19] dt-bindings: media: i2c: max96712: add support for I2C ATR

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Message-ID: <20250618095858.2145209-10-demonsingur@gmail.com>
Date: Wed, 18 Jun 2025 12:58:45 +0300
From: Cosmin Tanislav <demonsingur@...il.com>
To: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Niklas Söderlund <niklas.soderlund@...natech.se>,
	Julien Massot <julien.massot@...labora.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>
Cc: linux-media@...r.kernel.org (open list:MAXIM GMSL2 SERIALIZERS AND DESERIALIZERS),
	devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS),
	linux-kernel@...r.kernel.org (open list),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)),
	linux-staging@...ts.linux.dev (open list:STAGING SUBSYSTEM),
	linux-gpio@...r.kernel.org (open list:GPIO SUBSYSTEM:Keyword:(devm_)?gpio_(request|free|direction|get|set)),
	Cosmin Tanislav <cosmin.tanislav@...log.com>,
	Cosmin Tanislav <demonsingur@...il.com>
Subject: [PATCH v4 09/19] dt-bindings: media: i2c: max96712: add support for I2C ATR

MAX96712 and MAX96724 have more than one GMSL2 link, and each link is
capable of connecting to a separate serializer. If these serializers
have the same CFG pins configuration, they will also have the same I2C
address, causing conflicts unless the deserializer changes the address
of the connected serializers.

The MAX96712 and MAX96724 support changing the I2C address of the
connected serializers.

Document this capability.

Signed-off-by: Cosmin Tanislav <demonsingur@...il.com>
Acked-by: Rob Herring (Arm) <robh@...nel.org>
---
 .../bindings/media/i2c/maxim,max96712.yaml    | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml
index f712d7cfc35f..758c0223977d 100644
--- a/Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml
@@ -37,6 +37,30 @@ properties:
 
   enable-gpios: true
 
+  i2c-alias-pool:
+    maxItems: 4
+
+  i2c-atr:
+    type: object
+    additionalProperties: false
+
+    properties:
+      '#address-cells':
+        const: 1
+
+      '#size-cells':
+        const: 0
+
+    patternProperties:
+      '^i2c@[0-3]$':
+        $ref: /schemas/i2c/i2c-controller.yaml#
+        unevaluatedProperties: false
+        properties:
+          reg:
+            items:
+              minimum: 0
+              maximum: 3
+
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
 
@@ -79,6 +103,13 @@ required:
 
 additionalProperties: false
 
+allOf:
+  - $ref: /schemas/i2c/i2c-atr.yaml#
+
+dependentRequired:
+  i2c-atr: [i2c-alias-pool]
+  i2c-alias-pool: [i2c-atr]
+
 examples:
   - |
     #include <dt-bindings/gpio/gpio.h>
-- 
2.49.0