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SubjectRe: [PATCH] USB: ftdi_sio: add GPIO support
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On Fri, Jun 13, 2014 at 8:31 PM, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
> On Fri, Jun 13, 2014 at 09:25:07AM +0200, Linus Walleij wrote:

>> But I also want to bring the device model into question: normally
>> when a mother device spawns children across different subsystems
>> we model them as MFD devices (drivers/mfd) that instantiate
>> children for the different subsystems. So you could spawn a
>> serial and a GPIO device from a USB-based hub device there.
>>
>> I do not know if that is really apropriate in this case. It seems the
>> device is first and foremost FTDI.
>>
>> But it could still spawn a child platform device for the GPIO stuff
>> so that this can live as a separate driver under drivers/gpio/gpio-ftdi.c
>> or similar.
>>
>> You could then use something like:
>>
>> struct platform_device *gdev;
>
> Ick, no, it's a USB device, do not abuse the platform_device code any
> more than it currently is (note, I HATE the platform device code,
> someday I'll delete it entirely... Well, I can dream...)

Haha yeah :-)

However is the MFD cell approach acceptable?

Now MFD cells are platform_devices mind you, but it's
in principle just how that got implemented, MFD cells could
be device-something else.

Yours,
Linus Walleij


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