[PATCH] drm: don't link DP aux i2c adapter to the hardware device node

[Rob Herring]

On Mon, Jan 23, 2017 at 10:33 AM, Thierry Reding
<thierry.reding at gmail.com> wrote:
> On Fri, Jan 13, 2017 at 06:36:30PM +0100, Lucas Stach wrote:
>> The i2c adapter on DP AUX is purely a software construct. Linking
>> it to the device node of the parent device is wrong, as it leads to
>> 2 devices sharing the same device node, which is bad practice, as
>
> Who says that two devices can't share the same device node? It's done
> all the time.

It's done *some of the time* and I would not consider it best practice.

>> well as the i2c trying to populate children of the i2c adapter by
>> looking at the child device nodes of the parent device.
>
> A set of patches landed in v4.9 to work around this issue in a better
> way. See:
>
>         98b00488459e dt-bindings: i2c: Add support for 'i2c-bus' subnode
>         7e4c224abfe8 i2c: core: Add support for 'i2c-bus' subnode

What does this buy us? I don't see why this needs to be in DT either.
Contrary to popular belief, DT is not the only way to instantiate
devices, C code can still do it.

Also, if this one line removal has no side effects, then how was it
even needed? We can always add it back if there's some argument for
why it is needed.

Rob