Merge branch 'qmc-hdlc'

Herve Codina says:

====================
Add support for QMC HDLC

This series introduces the QMC HDLC support.

Patches were previously sent as part of a full feature series and were
previously reviewed in that context:
"Add support for QMC HDLC, framer infrastructure and PEF2256 framer" [1]

In order to ease the merge, the full feature series has been split and
needed parts were merged in v6.8-rc1:
 - "Prepare the PowerQUICC QMC and TSA for the HDLC QMC driver" [2]
 - "Add support for framer infrastructure and PEF2256 framer" [3]

This series contains patches related to the QMC HDLC part (QMC HDLC
driver):
 - Introduce the QMC HDLC driver (patches 1 and 2)
 - Add timeslots change support in QMC HDLC (patch 3)
 - Add framer support as a framer consumer in QMC HDLC (patch 4)

Compare to the original full feature series, a modification was done on
patch 3 in order to use a coherent prefix in the commit title.

I kept the patches unsquashed as they were previously sent and reviewed.
Of course, I can squash them if needed.

Compared to the previous iteration:
  https://lore.kernel.org/linux-kernel/20240306080726.167338-1-herve.codina@bootlin.com/
this v7 series mainly:
- Rename a variable.
- Fix reverse xmas tree declarations.
- Add 'Acked-by' tag.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>