[PATCH RFC 02/11 v4] gpio: Add sysfs support to block GPIO API

[Linus Walleij]

On Tue, Oct 16, 2012 at 6:43 PM, Greg KH <gregkh at linuxfoundation.org> wrote:
> On Tue, Oct 16, 2012 at 02:53:45PM +0200, Roland Stigge wrote:
>>
>> Further, current gpio and gpiochip devices are also doing this way:
>> creating the device and subsequently their attrs, even though there may
>> be a better way but I'm still wondering how this would be.
>
> Then the existing code is broken and should be fixed to use dev_attrs.
> I guess it's time to audit the tree and find all places that get this
> wrong...

The thing is, as I've tried to explain but maybe didn't get across,
that these devices don't *have* a parent, and are not part of any
tree.

They are parentless mock devices, created on-the-fly just to get
sysfs entries.

What is needed it to get the device model right in the first
place.

Fixing it has been drafted by me and Grant:
https://blueprints.launchpad.net/linux-linaro/+spec/gpiochip-to-dev

This is not all-encompassing though :-/

Yours,
Linus Walleij