This would be added post-kernel-feature-freeze for the kernel after
plucky beta, so asking for the release team to give a formal blessing so
that it's not a surprise.

The feature is requested by the snapd-team.

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https://bugs.launchpad.net/bugs/2103496

Title:
  Introduce configfs-based interface for gpio-aggregator

Status in linux package in Ubuntu:
  New
Status in linux source package in Noble:
  New
Status in linux source package in Oracular:
  New
Status in linux source package in Plucky:
  New

Bug description:
  [ Impact ]

  The existing 'new_device' interface for gpio-aggregator
   (https://docs.kernel.org/admin-guide/gpio/gpio-aggregator.html) has several 
limitations:

    * No way to determine when GPIO aggregator creation is complete.
    * No way to retrieve errors when creating a GPIO aggregator.
    * No way to trace a GPIO line of an aggregator back to its corresponding 
physical device.
    * The 'new_device' echo does not indicate which virtual gpiochip<N> was 
created.
    * No way to assign names to GPIO lines exported through an aggregator.

  While the GPIO aggregator concept is useful for resource isolation,
  these limitations currently hinder its practical effectiveness. This
  patch series addresses all those issues.

  [ Fix ]

  Apply 12 patches in total:

    * Apply [PATCH 1/3] to [PATCH 3/3] from [1], which have landed in 
linux-next.
    * Add a "UBUNTU: [Config]" commit for the new config option 
CONFIG_DEV_SYNC_PROBE.
    * Apply [PATCH 2/9] to [PATCH 9/9] from [2], which are under review.

  [1] 
https://lore.kernel.org/all/20250221133501.2203897-1-koichiro....@canonical.com/
  [2] 
https://lore.kernel.org/all/20250315164123.1855142-1-koichiro....@canonical.com/

  Note:
  - [1] is a preparatory patch series for [2].
  - [PATCH 1/9] from [2] was already picked and landed in mainline.

  [ Test Plan ]

  Run kselftest.

  [ Where problems could occur ]

  Any regressions would only impact users who load and use the
  gpio-aggregator module, potentially causing issues like memory leaks or
  system crashes.

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