Add support for Nuvoton NCT6122D/NCT6126D.

[Matthew.Nygard.Dodd_gmail.com]

Summary

Add support for Nuvoton NCT6122D/NCT6126D - superio(9), nctgpio(9), ncthwm(9)

• GPIO for LDN 7 & 9.
• HWM for LDN 11
• Provide LDN based matching for GPIO devices.
• Provide gpio(9) hint flag (NCT_NO_ENABLE) for skipping GPIO enable, to avoid altering BIOS setting.
• Allocate GPIO ioports as shareable.
• Constrain mask based matching for existing NCT6112D/NCT6114D/NCT6116D.

Test Plan

Tested on Asus N97T-IM-A:

(dmesg output)
superio0: <Nuvoton NCT6122D/NCT6126D> at port 0x2e-0x2f on isa0
gpio0: <GPIO on Nuvoton NCT6122D/NCT6126D> at GPIO ldn 0x07 on superio0
gpio0: skipping enable.
gpiobus0: <GPIO bus> on gpio0
gpioc0: <GPIO controller> on gpio0
gpio1: <GPIO on Nuvoton NCT6122D/NCT6126D> at GPIO ldn 0x09 on superio0
gpio1: skipping enable.
gpiobus1: <GPIO bus> on gpio1
gpioc1: <GPIO controller> on gpio1
ncthwm0: <HWM on Nuvoton NCT6122D/NCT6126D> at HWM ldn 0x0b on superio0

(sysctl)
dev.ncthwm.0.AUXFAN2: 0
dev.ncthwm.0.AUXFAN1: 0
dev.ncthwm.0.AUXFAN0: 0
dev.ncthwm.0.CPUFAN: 0
dev.ncthwm.0.SYSFAN: 796

[avg]

If you have added this from a diff, could you please re-do the diff with -U 9999 option?
That's to have a lot more context lines which would be useful when reviewing.

[Matthew.Nygard.Dodd_gmail.com]

In D47571#1084984, @avg wrote:

If you have added this from a diff, could you please re-do the diff with -U 9999 option?
That's to have a lot more context lines which would be useful when reviewing.

Done.

[avg]

In D47571#1085010, @Matthew.Nygard.Dodd_gmail.com wrote:

In D47571#1084984, @avg wrote:

If you have added this from a diff, could you please re-do the diff with -U 9999 option?
That's to have a lot more context lines which would be useful when reviewing.

Done.

Phabricator still tells me "Context not available".

[Matthew.Nygard.Dodd_gmail.com]

Add context.

[Matthew.Nygard.Dodd_gmail.com]

Remove spurious change.

[imp]

This seems good to my eye...
Do you need someone to commit it?

[Matthew.Nygard.Dodd_gmail.com]

In D47571#1086063, @imp wrote:

This seems good to my eye...
Do you need someone to commit it?

My commit bit has been inactive for years so yea, probably. :)