linux-kernel - Re: [PATCH v9 6/7] i2c: xiic: use numbered adapter registration

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Message-Id: <2F830E87-F00A-4A54-A5CC-E59BD2C5C7B2@nexthop.ai>
Date: Tue, 3 Feb 2026 10:14:49 -0800
From: Abdurrahman Hussain <abdurrahman@...thop.ai>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: Michal Simek <michal.simek@....com>,
 Andi Shyti <andi.shyti@...nel.org>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 linux-arm-kernel@...ts.infradead.org,
 linux-i2c@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH v9 6/7] i2c: xiic: use numbered adapter registration



> On Feb 3, 2026, at 7:45 AM, Andy Shevchenko <andriy.shevchenko@...el.com> wrote:
> 
> On Mon, Feb 02, 2026 at 08:37:23PM +0000, Abdurrahman Hussain via B4 Relay wrote:
> 
>> Use i2c_add_numbered_adapter() to allow platform devices to specify
>> fixed bus numbers when needed.
> 
> Not sure about this. Doesn't it break the current approach? Please, double
> check that.
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
> 

If pdev->id is PLATFORM_DEVID_NONE(-1) then i2c_add_numbered_adapter()
falls back to dynamic allocation and calls i2c_add_adapter().

Many existing i2c drivers use the same approach, see i2c-pxa.c and
i2c-pnx.c etc.