[PATCH v4 0/2] Aspeed GPIOP handover with managed controller lifetime

[Prasanth Kumar Padarthi]

This series continues the AST2600 global-to-local GPIOP passthrough
handover work, rebased on v7.4-rc1. It adds a shared pinctrl lifetime
fix before the G6 handover change.

The registration lifetime issue was identified by automated review:
the G6 callback data is devm-allocated, while the shared helper used
unmanaged pinctrl registration. Patch 1 switches registration to
devm_pinctrl_register(), ensuring unregister runs before earlier
devres allocations are freed. Patch 2 retains the v3 handover logic.

Changes since v3:
- Add managed registration as a separate prerequisite patch.
- Keep the handover implementation unchanged.
- Add KASAN lifecycle testing in QEMU and on B650D4U hardware.
- Update validation statements to distinguish lifecycle and power tests.

Validation:
- Shared helper and G4/G5/G6 objects compile-tested with W=1 on ARM.
- G7 SOC0 object compile-tested using ARM COMPILE_TEST; this was not
  an ARM64 build or G7 runtime test.
- Generic KASAN boot and one unbind/rebind cycle passed in AST2600
  QEMU and on physical B650D4U hardware. Controller entries disappeared
  on unbind and returned on rebind; a subsequent debugfs pins read
  succeeded. No KASAN reports were observed in the captured tests.
- The final v4 source tree matches the tested v3 tree plus the
  managed-registration change; only commit order and messages differ.
- Earlier remote power-on/off and physical-button power-on testing
  used an OpenBMC 6.18.24-based kernel, not this v7.4-rc1 test kernel.

The unfixed runtime comparison has not been performed. Concurrent
readers, probe-failure injection, mixed-pair forwarding, protected
writes and SCU510[28] hardware handling remain unvalidated. Existing
questions about probe-time normalization policy and concurrent SCU
writers also remain open. Electrical measurements are outside the
scope of this lifecycle test.

Supplementary procedure, exact source/config and logs:
https://github.com/prasanthp20/asrock-b650d4u-bmc-support/tree/64eaccfde9ac4ec35646c0b7a8663486775b5d3b/docs/experiments/03-pinctrl-lifecycle-kasan

Previous version:
https://lore.kernel.org/r/20261105152348.8567-1-prasanth.padarthi10@xxxxxxxxx

Please review the shared lifetime fix and the GPIOP handover policy.


Prasanth Kumar Padarthi (2):
  pinctrl: aspeed: Use managed pinctrl registration
  pinctrl: aspeed: Hand over global GPIOP passthrough to local mux
    controls

 drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c | 145 ++++++++++++++++++++-
 drivers/pinctrl/aspeed/pinctrl-aspeed.c    |   3 +-
 2 files changed, 143 insertions(+), 5 deletions(-)


base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
-- 
2.47.3