Re: GPIO driver for Intel Atom SoC

Hi Ian

Thanks for the heads up.

This is a vanilla Intel chip with ACPI.
ACPI ID is INT33FF (Intel Serial IO GPIO Controller).

I don't think I need to worry about FDT. (Hopefully)
I can't find any traces of FDT in the Linux driver.


On Sun, Jun 12, 2016 at 10:12 AM, Ian Lepore <ian_at_freebsd.org> wrote:

> On Sat, 2016-06-11 at 21:59 -0700, Lundberg, Johannes wrote:
> > Hi
> >
> > I want to port the pinctrl-cherryview driver from Linux.
> >
> > I've seen there is the gpiobus and a controller gpioc, can any of
> > these be
> > leverage when porting pinctrl?
> >
> > What is the recommend way to proceed?
> >
> > Thanks!
> >
>
> The term 'pinctrl' has a very specific meaning in the FDT/devicetree
> world which is prevelant in linux these days.  A pinctrl driver is not
> just a gpio controller driver.  If the linux driver you're talking
> about is in fact an FDT pinctrl driver, then you'll essentially be
> embracing the entire FDT world (it's an alternative to ACPI and hints
> and other types of metadata for describing hardware).  You'll also be
> breaking new ground in freebsd by being the first to try to use
> freebsd's FDT support framework on an x86 platform.
>
> -- Ian
>

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