Empty dma-ranges in DT nodes using 3-cell address spcifier cause the
flag portion to be dropped by of_translate_one(), failing the translation
chain. This patch aims at fixing this issue.

Part of this patchset was originally preparatory for a bigger patchset
(see [1]). It has been split in a standalone one for better management
and because it contains a bugfix which is probably of interest to stable
branch.
I've also added new tests to unittest to prove it.

Many thanks,
Andrea

References:
[1] - https://lore.kernel.org/all/3029857353c9499659369c1540ba887d7860670f.1730123575.git.andrea.porta@suse.com/ (local)


Changes in V2:

- Added blank lines between paragraphs in commit message for patch 2
- Fixed a comment to explain the code behaviour in a straighter way


Andrea della Porta (2):
  of/unittest: Add empty dma-ranges address translation tests
  of: address: Preserve the flags portion on 1:1 dma-ranges mapping

 drivers/of/address.c                        |  3 +-
 drivers/of/unittest-data/tests-address.dtsi |  2 ++
 drivers/of/unittest.c                       | 39 +++++++++++++++++++++
 3 files changed, 43 insertions(+), 1 deletion(-)

-- 
2.35.3