Re: [PATCH] USB: ftdi_sio: add GPIO support

[Linus Walleij]

On Sat, May 30, 2015 at 10:29 PM, Grant Likely
<grant.likely@xxxxxxxxxxxx> wrote:
> On Mon, Jul 7, 2014 at 6:31 PM, Greg Kroah-Hartman
> <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:

>>> However is the MFD cell approach acceptable?
>>
>> Yes it is.
>
> Going back to this old conversation... Actually, I disagree. There is
> absolutely no need to go the MFD approach for this driver. That just
> adds layers of abstraction for no purpose. GPIOLIB is an interface,
> and it is completely fine for a driver to hook up to the GPIOLIB
> interface at the same time as exposing a serial port. MFD doesn't buy
> the driver anything useful here.

What is buys is centralizing code into the proper drivers/gpio
folder of the kernel. So more of a maintenance point than a
mechanics/performance point.

We do have GPIO drivers scattered all over the kernel so one
more or less wouldn't matter so much...

Yours,
Linus Walleij
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