[PATCH 0/3] mtd: spi-nor: Add VIA/WonderMedia serial flash controller driver

[Alexey Charkov]

Add a driver for the self-contained SPI NOR flash controller found on
VIA/WonderMedia SoCs, along with the respective DT binding and DTS.

The driver is a clean reimplementation based on the Linux SPI NOR
framework, although only chip probing routines are SPI NOR specific.
The rest of the controller operation is abstracted away behind a small
set of MMIO registers and a physical memory mapping for chip contents.
In fact, the vendor's implementation open-coded all driver operations
on top of the MTD framework directly, but had to rely on a static table
of supported flash chips indexed by ID due to the lack of auto-probing.

Signed-off-by: Alexey Charkov <alchark at gmail.com>
---
Alexey Charkov (3):
      dt-bindings: spi: Add VIA/WonderMedia serial flash controller
      mtd: spi-nor: Add a driver for the VIA/WonderMedia serial flash controller
      ARM: dts: vt8500: Add serial flash controller and its clock

 .../devicetree/bindings/spi/via,vt8500-sflash.yaml | 122 +++++
 MAINTAINERS                                        |   2 +
 arch/arm/boot/dts/vt8500/vt8500-bv07.dts           |  37 ++
 arch/arm/boot/dts/vt8500/vt8500.dtsi               |  34 ++
 arch/arm/boot/dts/vt8500/wm8505-ref.dts            |  37 ++
 arch/arm/boot/dts/vt8500/wm8505.dtsi               |  21 +
 arch/arm/boot/dts/vt8500/wm8650-mid.dts            |  37 ++
 arch/arm/boot/dts/vt8500/wm8650.dtsi               |  21 +
 arch/arm/boot/dts/vt8500/wm8750-apc8750.dts        |  37 ++
 arch/arm/boot/dts/vt8500/wm8750.dtsi               |  21 +
 arch/arm/boot/dts/vt8500/wm8850-w70v2.dts          |  37 ++
 arch/arm/boot/dts/vt8500/wm8850.dtsi               |  21 +
 arch/arm/boot/dts/vt8500/wm8950-apc-rock.dts       |  37 ++
 drivers/mtd/spi-nor/controllers/Kconfig            |  14 +
 drivers/mtd/spi-nor/controllers/Makefile           |   1 +
 drivers/mtd/spi-nor/controllers/wmt-sflash.c       | 525 +++++++++++++++++++++
 16 files changed, 1004 insertions(+)
---
base-commit: ed61cb3d78d585209ec775933078e268544fe9a4
change-id: 20250510-wmt-sflash-b0ba35f1a3ae

Best regards,
-- 
Alexey Charkov <alchark at gmail.com>