linux-kernel - [RFC PATCH 18/24] dt-bindings: media: i2c: max96712: add support for I2C MUX

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Message-ID: <20250308183410.3013996-19-demonsingur@gmail.com>
Date: Sat,  8 Mar 2025 20:33:47 +0200
From: Cosmin Tanislav <demonsingur@...il.com>
To: 
Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Niklas Söderlund <niklas.soderlund@...natech.se>,
	Cosmin Tanislav <cosmin.tanislav@...log.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Julien Massot <julien.massot@...labora.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Bjorn Andersson <quic_bjorande@...cinc.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Biju Das <biju.das.jz@...renesas.com>,
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	Nícolas F . R . A . Prado <nfraprado@...labora.com>,
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	Dongcheng Yan <dongcheng.yan@...el.com>,
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	Benjamin Mugnier <benjamin.mugnier@...s.st.com>,
	Tommaso Merciai <tomm.merciai@...il.com>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Ricardo Ribalda <ribalda@...omium.org>,
	Ihor Matushchak <ihor.matushchak@...box.net>,
	Laurentiu Palcu <laurentiu.palcu@....nxp.com>,
	linux-media@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-staging@...ts.linux.dev,
	linux-gpio@...r.kernel.org,
	Cosmin Tanislav <demonsingur@...il.com>
Subject: [RFC PATCH 18/24] dt-bindings: media: i2c: max96712: add support for I2C MUX

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 muxes the I2C
channels. Moreover, the serializers can have the same hardware attached
to their respective I2C bus.

The MAX96712 and MAX96724 suppot I2C channel muxing via the GMSL2 link
to facilitate communication to each of the connected serializers.

Document this capability.

Signed-off-by: Cosmin Tanislav <demonsingur@...il.com>
---
 .../devicetree/bindings/media/i2c/maxim,max96712.yaml | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml
index 52b5603c2f53..4c4542d041cd 100644
--- a/Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max96712.yaml
@@ -37,6 +37,17 @@ properties:
 
   enable-gpios: true
 
+  i2c-mux:
+    $ref: /schemas/i2c/i2c-mux.yaml#
+    patternProperties:
+      '^i2c@[0-3]$':
+        $ref: /schemas/i2c/i2c-controller.yaml#
+        properties:
+          reg:
+            items:
+              min: 0
+              max: 3
+
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
 
-- 
2.48.1