GPIO Driver for Skylake-Y PCH

[Alexander Ivanov]

On Tue, 18 Jun 2019 08:58 -07:00, Andy Shevchenko <andriy.shevchenko at linux.intel.com> wrote:
> On Tue, Jun 18, 2019 at 10:48:45AM -0400, Valdis Klētnieks wrote:
> > On Tue, 18 Jun 2019 11:40:34 +0300, Andy Shevchenko said:
> > 
> > > Yes. Most of the SoCs from Intel use GPIO IP based on Chassis specification,
> > > the drivers for which are available under drivers/pinctrl/intel. What you are
> > > looking for is located under PINCTRL_SUNRISEPOINT configuration option.
> > 
> > Thanks for the info, it's often unclear where to look - when the hardware has
> > a PCH and documentation that says it has GPIO, and there's an in-tree driver
> > called gpio_pch, it's easy to fail to look in the right place :)
> 

Thank you for the info, indeed. I'm going to give it a try.


> Citing in-kernel documentation:
> 
> --- 8< --- 8< ---- 8< ---
> 
> Electrical properties of the pin such as biasing and drive strength
> may be placed at some pin-specific register in all cases or as part
> of the GPIO register in case (B) especially. This doesn't mean that such
> properties necessarily pertain to what the Linux kernel calls "GPIO".
> 

Given the amount of related (and not so much) documentation, it's hard to miss.
That's what this newsgroup for :)
Thank you for helping!