linux-kernel - Re: [PATCH v2 3/4] dt-bindings: mfd: Add Delta TN48M CPLD drivers bindings

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Date:   Wed, 02 Jun 2021 12:22:09 +0200
From:   Michael Walle <michael@...le.cc>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Robert Marko <robert.marko@...tura.hr>,
        Rob Herring <robh@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        bgolaszewski@...libre.com, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luka Perkov <luka.perkov@...tura.hr>, jmp@...phyte.org,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Donald Buczek <buczek@...gen.mpg.de>
Subject: Re: [PATCH v2 3/4] dt-bindings: mfd: Add Delta TN48M CPLD drivers
 bindings

Am 2021-06-01 16:48, schrieb Lee Jones:
> On Tue, 01 Jun 2021, Lee Jones wrote:
> 
>> On Tue, 01 Jun 2021, Michael Walle wrote:
>> 
>> > Am 2021-06-01 10:19, schrieb Lee Jones:
>> > > Why do you require one single Regmap anyway?  Are they register banks
>> > > not neatly separated on a per-function basis?
>> >
>> > AFAIK you can only have one I2C device driver per device, hence the
>> > simple-mfd-i2c.
>> 
>> Sorry, can you provide more detail.
> 
> I'd still like further explanation to be sure, but if you mean what I
> think you mean then, no, I don't think that's correct.

We've already discussed this:

https://lore.kernel.org/lkml/20200622075145.1464020-1-lee.jones@linaro.org/
https://lore.kernel.org/lkml/20200605065709.GD3714@dell/

And how would a device tree binding look like if you have multiple
i2c devices with the same i2c address?

-michael