[PATCH v2 0/1] coreboot CFR firmware attributes

[Sean Rhodes <sean@starlabs.systems>]

Hi,

This adds a firmware-attributes driver for coreboot CFR tables.

Changes since v1:
- Add explicit includes for the helper APIs used by the driver.
- Use __free(kfree) and no_free_ptr() for EFI name allocation.
- Use isascii() for EFI variable name validation.
- Convert the EFI write path mutex to scoped_guard().
- Rename the label/current-value parser to avoid default-value ambiguity.
- Use devm_kzalloc() and devm_mutex_init() for the driver state.
- Clarify that -EOPNOTSUPP after a successful EFI write is the
  reboot-required path.

Tested on Star Labs Lite GLKR, firmware 26.07, Linux 6.17.0-35-generic:
loaded coreboot_table and coreboot-cfr as test modules, verified
firmware-attributes sysfs exposure, fwupd BIOS settings enumeration, and
the reboot-required write path with debug_level.

Thanks,
Sean

Sean Rhodes (1):
  platform/x86: Add coreboot CFR firmware attributes

 MAINTAINERS                              |   6 +
 drivers/firmware/google/coreboot_table.h |  45 --
 drivers/platform/x86/Kconfig             |  13 +
 drivers/platform/x86/Makefile            |   1 +
 drivers/platform/x86/coreboot-cfr.c      | 986 +++++++++++++++++++++++
 include/linux/coreboot.h                 | 147 ++++
 6 files changed, 1153 insertions(+), 45 deletions(-)
 create mode 100644 drivers/platform/x86/coreboot-cfr.c