[PATCH v6 00/12] Add FIT image overlay support

[Marco Felsch]

Hi,

this series add the support to load FIT image supplied devicetree overlays.

The overlay loading wasn't coupled to bootm due to the following
reasons:
 - Users can add their own overlay filter
 - By making use of the common overlay handling we can specifiy a
   different/separate FIT image which provides only overlays.
 - It should be possible to apply FIT image overlay to the barebox
   live-tree (not implemented yet).

Signed-off-by: Marco Felsch <m.felsch at pengutronix.de>
---
Changes in v6:
- Link to v5: https://lore.barebox.org/20250818-v2024-05-0-topic-fit-overlay-v5-0-b92e466a1d32@pengutronix.de
- devicetree.rst: Adapt documentation, drop absolute path requirement
- of_overlay_global_fixup(): Make use of %m instead of strerror(errno)
- Add more overlay matching debug output
- fit_open(): Drop absolute path requirement to allow "bootm bar.fit"
  use-cases.

Changes in v5:
- Link to v4: https://lore.barebox.org/20250729-v2024-05-0-topic-fit-overlay-v4-0-af3ad99acde2@pengutronix.de
- fail if CONFIG_FITIMAGE=n and fit overlay was requested
- of_overlay_global_fixup(): adapt pr_err() if stat() fails
- of_overlay_global_fixup(): Drop duplicated pr_err() if FIT overlay load fails
- of_overlay_global_fixup(): Drop filetype detection
- devicetree.rst: Fix documentation

Changes in v4:
- Link to v3: https://lore.barebox.org/20240703-v2024-05-0-topic-fit-overlay-v3-0-c1fd766fd31d@pengutronix.de
- resolve possible filename links to make caching more robust

Changes in v3:
- Link to v2: https://lore.barebox.org/barebox/20240613125818.30499-1-m.felsch@pengutronix.de/
- drop of.overlay.fitconfigpattern usage and make use of an match-fn
  instead
- fit_get_handle(): make use of strcmp
- open_fits: make it static
- fit_close(): use free unconditional

Changes in v2:
- Link to v1: https://lore.pengutronix.de/barebox/20240322164953.1772129-1-m.felsch@pengutronix.de/
- add caching to improve the overlay load time if the same FIT, which
  provides the overlays, provides the kernel, of, initrd.

---
Marco Felsch (12):
      FIT: fix missing free in fit_open error path
      FIT: fit_open_configuration: add match function support
      of: overlay: make the pattern match function more generic
      of: overlay: make search dir more generic
      of: overlay: refactor of_overlay_global_fixup
      FIT: make fit_config_verify_signature public
      of: overlay: add FIT image overlay support
      of: overlay: replace filename with an more unique name
      of: overlay: add more debugging prints to of_overlay_matches_filter
      FIT: fit_open: canonicalize provided filename
      FIT: fit_open: save the filename
      FIT: add support to cache opened fit images

 Documentation/user/devicetree.rst |  26 ++---
 common/bootm.c                    |  13 ++-
 common/image-fit.c                |  70 ++++++++++--
 drivers/of/overlay.c              | 222 ++++++++++++++++++++++++++++++--------
 include/image-fit.h               |  10 +-
 include/of.h                      |   3 +-
 6 files changed, 278 insertions(+), 66 deletions(-)
---
base-commit: 89bf1fcc998fc5fea0ce613d9930dd9ee39c0fb2
change-id: 20240703-v2024-05-0-topic-fit-overlay-76d5176c1d4e

Best regards,
-- 
Marco Felsch <m.felsch at pengutronix.de>