Introduce DDR4 bindings, which is the first DDR type to be added.
As the DDR and LPDDR use the same properties, factorise them in a
sdram-props bindings file and rename lpddr-channel into sdram-channel.

This v7 is a subset of the v6 and other prior versions, split to simplify
the review and merging process.

Changes in v7:
- None
- Link to v6: https://lore.kernel.org/all/20250909-b4-ddrperfm-upstream-v6-5-ce082cc801b5@gmail.com/

Signed-off-by: Clément Le Goffic <legoffic.clement@gmail.com>
---
Clément Le Goffic (7):
      dt-bindings: memory: factorise LPDDR props into SDRAM props
      dt-bindings: memory: introduce DDR4
      dt-bindings: memory: factorise LPDDR channel binding into SDRAM channel
      dt-binding: memory: add DDR4 channel compatible
      dt-bindings: memory: SDRAM channel: standardise node name
      arm64: dts: st: add LPDDR channel to stm32mp257f-dk board
      arm64: dts: st: add DDR channel to stm32mp257f-ev1 board

 .../memory-controllers/ddr/jedec,ddr4.yaml         | 34 ++++++++
 .../memory-controllers/ddr/jedec,lpddr-props.yaml  | 74 -----------------
 .../memory-controllers/ddr/jedec,lpddr2.yaml       |  2 +-
 .../memory-controllers/ddr/jedec,lpddr3.yaml       |  2 +-
 .../memory-controllers/ddr/jedec,lpddr4.yaml       |  2 +-
 .../memory-controllers/ddr/jedec,lpddr5.yaml       |  2 +-
 ...lpddr-channel.yaml => jedec,sdram-channel.yaml} | 40 ++++++---
 .../memory-controllers/ddr/jedec,sdram-props.yaml  | 94 ++++++++++++++++++++++
 arch/arm64/boot/dts/st/stm32mp257f-dk.dts          |  7 ++
 arch/arm64/boot/dts/st/stm32mp257f-ev1.dts         |  7 ++
 10 files changed, 173 insertions(+), 91 deletions(-)
---
base-commit: 07e27ad16399afcd693be20211b0dfae63e0615f
change-id: 20250922-b4-ddr-bindings-7161e3e0af56

Best regards,
--  
Clément Le Goffic <legoffic.clement@gmail.com>