GPIO Driver for Skylake-Y PCH

[Alexander Ivanov]

On Tue, 18 Jun 2019 01:41 -07:00, Andy Shevchenko <andriy.shevchenko at linux.intel.com> wrote:
> > 
> > Obviously, I am wrong here. However, the question stands, is there linux kernel support for Intel PCH GPIO?
> 
> 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.
> 

My box is updated with current Fedora distro and now running 5.0.9-301.fc30.x86_64. It's also said that the box has Sunrisepoint chipset. For this chipset, 5.0.9 kernel support following devices:

static const struct acpi_device_id spt_pinctrl_acpi_match[] = {
	{ "INT344B", (kernel_ulong_t)&sptlp_soc_data },
	{ "INT345D", (kernel_ulong_t)&spth_soc_data },
	{ }
};

[ https://elixir.bootlin.com/linux/v5.0.9/source/drivers/pinctrl/intel/pinctrl-sunrisepoint.c#L587 ]

I believe the box has INT344B device attached to acpi bus proper:

$ sudo ls -la /sys/bus/acpi/devices/INT344*
...
lrwxrwxrwx. 1 root root 0 Jun 20 11:47 /sys/bus/acpi/devices/INT344B:00 -> ../../../devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/INT344B:00


Drivers seem loaded:

$ lsmod | grep pin
pinctrl_sunrisepoint    28672  0
pinctrl_intel          28672  1 pinctrl_sunrisepoint

However, I don't see any gpio devices.

$ ls /dev/gpio*
ls: cannot access '/dev/gpio*': No such file or directory
$ ls /sys/bus/gpio/devices/
$

What am I still missing?