controlling pinctrl GPIOs from userspace on x86

["Gerd v. Egidy" <lists@xxxxxxxx>]

Hi,

I have a x86 mainboard with a Intel Sunrise Point chipset. One function I want 
to control is tied to a specific GPIO on the chipset (GPP_E1 / SATAXPCIE_1). 
There seems to be a driver for this in the kernel: 
pinctrl/intel/pinctrl-sunrisepoint.c

The easiest solution for me would be if I could control this GPIO from 
userspace. 

I have seen examples where a pin from pinctrl is made available to the "gpio" 
driver with a devicetree setting on arm devices. But I have a x86 system with 
a classic BIOS, so no devicetree here to help me.

I have seen that there is pinconf which should give some info and control over 
pinctrl through debugfs, correct?. So I enabled CONFIG_PINCONF, but after 
loading the pinctrl-sunrisepoint module I could not see anything relating to 
this show up in /sys/kernel/debug.

Do I need to manually register the driver with the device somehow? I have 
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/INT345D:00 which seems to be 
what the driver is looking for.

Am I missing something?

Or is pinconf not going to help me? What to use instead?

Thanks.

Kind regards,

Gerd

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