How can My linux kernel detect gpio or pinctrl on denverton platform ?

Hi,

Linux kernel- 4.14. confing debug gpio and pinctrl-denverton, pinctrl-intel.
Coreboot-4.10 using denverton and harcuvar.
However, linux kernel not dectect gpio and pinctrl.
Thanks.
Jason

[Michal Zygowski]

Hi,

Looking at harcuvar board and denverton_ns SoC sources it looks like the
GPIO controller is not defined in ACPI. It may be causing the probe to
fail for pinctrl in Linux. There is simply no GPIO ASL code for
denverton_ns. For example refer to soc/intel/skylake/acpi/gpio.asl.

Regards,

[Stephen Douthit]

On 1/17/20 5:38 AM, Michal Zygowski wrote:
> Hi,
>
> Looking at harcuvar board and denverton_ns SoC sources it looks like the
> GPIO controller is not defined in ACPI. It may be causing the probe to
> fail for pinctrl in Linux. There is simply no GPIO ASL code for
> denverton_ns. For example refer to soc/intel/skylake/acpi/gpio.asl.

That's correct.  The Linux pinctrl driver expects to bind to an
"INTC3000" ACPI device.[1]

For Denverton there are two BARs and one interrupt.

-Steve

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/driv...