[PATCH v1 0/1] nvmem: aspeed: Add read-only AST2600 OTP support

[Prasanth Kumar Padarthi]

Add a root-only, read-only NVMEM provider for AST2600 OTP, with serialized
controller access, bounded polling and configured secure-prefix checks.
The driver adapts ASPEED's downstream read sequence and preserves its
attribution.

Tested on ASRock Rack B650D4U (AST2600 A3), OpenBMC Linux 6.18.24:
- Repeated, paired and cross-pair reads matched.
- Four concurrent readers completed 40 matching reads.
- Bytes 8172..8183 matched a separate vendor-derived reader.
- Synthetic pre-MMIO timeout, failure latching and rebind recovery passed.

Host fault-injection tests also passed all 42 polling-timeout cases using
simulated registers and virtual time.

Prasanth Kumar Padarthi (1):
  nvmem: aspeed: Add read-only AST2600 OTP support

 MAINTAINERS                 |   1 +
 drivers/nvmem/Kconfig       |  12 ++
 drivers/nvmem/Makefile      |   1 +
 drivers/nvmem/ast2600-otp.c | 259 ++++++++++++++++++++++++++++++++++++
 4 files changed, 273 insertions(+)
 create mode 100644 drivers/nvmem/ast2600-otp.c