linux-kernel - Re: [PATCH v3 1/1] schemas: i2c: Introduce I2C bus extensions

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Message-ID: <aLGHvqY6N5oI54eT@shikoro>
Date: Fri, 29 Aug 2025 12:58:06 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Herve Codina <herve.codina@...tlin.com>
Cc: Rob Herring <robh@...nel.org>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Ayush Singh <ayush@...gleboard.org>,
	Andi Shyti <andi.shyti@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-i2c@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree-spec@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 1/1] schemas: i2c: Introduce I2C bus extensions

Hi Hervé,

> the only solution I see is to parse the full DT in order to find extension
> nodes when we need to register adapter children (adapter probe() step).
> 
> A matching extension node will be a node where:
>  1) compatible = "i2c-bus-extension"
>  2) "i2c-parent" phandle points to the expected adapter.

Would that be so bad? It will not be done often, or?

All the best,

   Wolfram