[PATCH v3 0/4] spi: add support for Amlogic A9

[Xianwei Zhao via B4 Relay]

Add bindings for A9 with some features, and driver for A9 base on A4.

Fix the incorrect keep_ss of the last descriptor.

Signed-off-by: Xianwei Zhao <xianwei.zhao at amlogic.com>
---
Changes in v3:
- Re-wrap binding commit msg and drop "amlogic,word-gap" property.
- Handle the hardware word gap through the existing word_delay mechanism in the transfer path instead.
- Link to v2: https://lore.kernel.org/r/20260723-a9-spisg-v2-0-9fc39106b7e2@amlogic.com

Changes in v2:
- Move the added properties defined to top-level and then reestrict them  in bindings.
- Fix some pre-exiting bug reported by Sashiko AI review that as a separate submission.
- Limit the value that will be writed to CFG_CS_HOLD.
- Link to v1: https://lore.kernel.org/r/20260717-a9-spisg-v1-0-2eeea77be19f@amlogic.com

---
Sunny Luo (1):
      spi: amlogic: spisg: Fix the incorrect keep_ss of the last descriptor

Xianwei Zhao (3):
      spi: dt-bindings: amlogic: spisg: Document A9-specific properties
      spi: amlogic: spisg: Fix transfer size limit and timeout handling
      spi: amlogic: spisg: Add support for A9 controller features

 .../devicetree/bindings/spi/amlogic,a4-spisg.yaml  | 30 ++++++-
 drivers/spi/spi-amlogic-spisg.c                    | 99 +++++++++++++++++++---
 2 files changed, 111 insertions(+), 18 deletions(-)
---
base-commit: d0b5dd16226814e5c73ba8daf88d3d91c990a38f
change-id: 20260715-a9-spisg-f19ce0403a50

Best regards,
-- 
Xianwei Zhao <xianwei.zhao at amlogic.com>