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Date:   Tue, 5 Oct 2021 18:28:16 +0200
From:   Alexandre Belloni <>
To:     Arnd Bergmann <>
Cc:     Paweł Anikiel <>,,
        Andy Shevchenko <>,
        Mika Westerberg <>,
        Rob Herring <>,
        Philipp Zabel <>,
        Olof Johansson <>, SoC Team <>,
        Dinh Nguyen <>,
        Pratyush Yadav <>,
        Tudor Ambarus <>,
        Linux I2C <>,
        Linux Kernel Mailing List <>,
        Sebastian Reichel <>,
        "Leizhen (ThunderTown)" <>,
        Jonathan Cameron <>,
        DTML <>,
        Linux ARM <>,, Tomasz Nowicki <>,,
Subject: Re: [PATCH v2 2/4] dt-bindings: add bus number property

On 05/10/2021 18:22:12+0200, Arnd Bergmann wrote:
> On Tue, Oct 5, 2021 at 4:37 PM Paweł Anikiel <> wrote:
> >
> > On SoCFPGA systems, it's desireable to have fixed numbering for
> > i2c busses, while being able to enable/disable them (e.g. have i2c1
> > be mapped to /dev/i2c-1, even though i2c0 is disabled). This can also
> > be achieved using devicetree aliases (see i2c_add_adapter). However,
> > having the driver be self-contained without relying on aliases is more
> > robust.
> >
> > Signed-off-by: Paweł Anikiel <>
> I don't see how adding a nonstandard property in one of the i2c bus
> drivers helps at all. How do you expect this to work when there are
> multiple i2c controllers in the system using different drivers? What
> should happen if both an alias and the busno property are set?

What happens when two nodes have the same busno property because e.g.
one is in a dtsi and the other one is in a dts?

Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering

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