[linux-nvidia-6.17] Backport GPIO line name prefix handling

[nvmochs]

These two upstream patches (currently in linux-next, ETA v7.1) add support for GPIO devices on multi-socket systems and are required for VR. Without these patches, there are duplicate gpio names and the kernel logs warnings during boot:

$ sudo gpioinfo
gpiochip0 - 30 lines:
	line   0: "COMPUTE-PA.00" kernel input active-high [used]
...
	line  29: "COMPUTE-PE.07" kernel input active-high [used]
gpiochip1 - 94 lines:
	line   0: "SYSTEM-PA.00" kernel input active-high [used]
...
	line  93: "SYSTEM-PV.01" unused input active-high 
gpiochip2 - 30 lines:
	line   0: "COMPUTE-PA.00" kernel input active-high [used]
...
	line  29: "COMPUTE-PE.07" kernel input active-high [used]
gpiochip3 - 94 lines:
	line   0: "SYSTEM-PA.00" kernel input active-high [used]
...
	line  93: "SYSTEM-PV.01" unused input active-high 

$ sudo journalctl -k -b 0 | grep -i collision 
Mar 11 18:05:37 localhost.localdomain kernel: gpio gpiochip2: Detected name collision for GPIO name 'COMPUTE-PA.00'
Mar 11 18:05:37 localhost.localdomain kernel: gpio gpiochip2: Detected name collision for GPIO name 'COMPUTE-PA.01'
Mar 11 18:05:37 localhost.localdomain kernel: gpio gpiochip2: Detected name collision for GPIO name 'COMPUTE-PA.02'
Mar 11 18:05:37 localhost.localdomain kernel: gpio gpiochip2: Detected name collision for GPIO name 'COMPUTE-PB.00’

With the patches in place on a system that defines ACPI PXM nodes for the GPIO devices, gpio names include the corresponding NUMA node:

$ sudo gpioinfo
gpiochip0 - 30 lines:
	line   0: "0-COMPUTE-PA.00" kernel input active-high [used]
...
	line  29: "0-COMPUTE-PE.07" kernel input active-high [used]
gpiochip1 - 94 lines:
	line   0: "0-SYSTEM-PA.00" kernel input active-high [used]
...
	line  93: "0-SYSTEM-PV.01" unused input active-high 
gpiochip2 - 30 lines:
	line   0: "1-COMPUTE-PA.00" kernel input active-high [used]
...
	line  29: "1-COMPUTE-PE.07" kernel input active-high [used]
gpiochip3 - 94 lines:
	line   0: "1-SYSTEM-PA.00" kernel input active-high [used]
...
	line  93: "1-SYSTEM-PV.01" unused input active-high 

This removes the collisions warnings during boot:

$ sudo journalctl -k -b 0 | grep -i collision 
$

LKML: https://lore.kernel.org/all/20260217081431.1208351-1-pshete@nvidia.com/

linux-next:

2423e336d948 gpio: tegra186: Simplify GPIO line name prefix handling
2c299030c681 gpio: tegra186: Support multi-socket devices

---

To test, I verified the presence of the PXM nodes:

$ egrep -A 2 'NVDA0808|NVDA0708' *.dsl
dsdt.dsl:            Name (_HID, "NVDA0708")  // _HID: Hardware ID
dsdt.dsl-            Name (_UID, 0x00)  // _UID: Unique ID
dsdt.dsl-            Name (_PXM, 0x00)  // _PXM: Device Proximity
--
dsdt.dsl:            Name (_HID, "NVDA0808")  // _HID: Hardware ID
dsdt.dsl-            Name (_UID, 0x00)  // _UID: Unique ID
dsdt.dsl-            Name (_PXM, 0x00)  // _PXM: Device Proximity
--
ssdt18.dsl:            Name (_HID, "NVDA0708")  // _HID: Hardware ID
ssdt18.dsl-            Name (_UID, 0x10)  // _UID: Unique ID
ssdt18.dsl-            Name (_PXM, 0x01)  // _PXM: Device Proximity
--
ssdt18.dsl:            Name (_HID, "NVDA0808")  // _HID: Hardware ID
ssdt18.dsl-            Name (_UID, 0x10)  // _UID: Unique ID
ssdt18.dsl-            Name (_PXM, 0x01)  // _PXM: Device Proximity

And the removal of the duplicate gpio names and collision warnings (included above).

Note that this requires UEFI support added in nvb5277588.

---

LP: https://bugs.launchpad.net/ubuntu/+source/linux-nvidia-6.17/+bug/2143954

[clsotog]

Acked-by: Carol L Soto <csoto@nvidia.com>

[jamieNguyenNVIDIA]

Acked-by: Jamie Nguyen <jamien@nvidia.com>

[nvmochs]

PR submitted to Canonical.