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

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Message-Id: <20250510-wmt-sflash-v1-0-02a1ac6adf12@gmail.com>
Date: Sat, 10 May 2025 23:42:20 +0400
From: Alexey Charkov <alchark@...il.com>
To: Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Pratyush Yadav <pratyush@...nel.org>, Michael Walle <mwalle@...nel.org>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Krzysztof Kozlowski <krzk@...nel.org>
Cc: linux-spi@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org, 
 linux-arm-kernel@...ts.infradead.org, Alexey Charkov <alchark@...il.com>
Subject: [PATCH 0/3] mtd: spi-nor: Add VIA/WonderMedia serial flash
 controller driver

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@...il.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@...il.com>