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

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Message-ID: <20250829130821.472a96dc@bootlin.com>
Date: Fri, 29 Aug 2025 13:08:21 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.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 Wolfram,

On Fri, 29 Aug 2025 12:58:06 +0200
Wolfram Sang <wsa+renesas@...g-engineering.com> wrote:

> 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?

Ok I will propose a binding update in that sense (dtschema repo) and an
implementation (kernel repo).

Best regards,
Hervé