[PATCH 0/8] Add VIM4 MCU/FAN support
From: Ronald Claveau
Date: Thu Apr 02 2026 - 10:34:02 EST
The Khadas VIM4 board features a different MCU variant compared to
previous VIM boards.
While it shares the same I2C-based communication model,
it differs in some ways:
- A distinct register map with its own volatile/writeable register set
- A fan control with 0–100 levels instead of the 0–3 levels previously
- A fan power supply gated through a regulator
This series adds support for this new variant by:
1. Refactoring the khadas-mcu MFD driver to use per-variant data
structures (regmap config, cells, fan platform data),
and adding the khadas,vim4-mcu compatible string.
2. Extending the fan thermal driver to retrieve the fan register
and maximum level from platform_data,
and to optionally manage a power regulator for the fan supply.
3. Adding the corresponding DTS node for the VIM4, wiring the MCU to
the I2C AO_A bus and exposing it as a thermal cooling device.
Signed-off-by: Ronald Claveau <linux-kernel-dev@xxxxxxxx>
---
Ronald Claveau (8):
dt-bindings: mfd: khadas: Add new compatible for Khadas VIM4 MCU
dt-bindings: i2c: amlogic: Add compatible for T7 SOC
mfd: khadas-mcu: Add per-variant configuration infrastructure and VIM4 support
mfd: khadas-mcu: Add support for VIM4 MCU variant
thermal: khadas-mcu-fan: Add fan config from platform data Add regulator support
arm64: dts: amlogic: t7: Add i2c pinctrl node
arm64: dts: amlogic: t7: Add i2c controller node
arm64: dts: amlogic: t7: khadas-vim4: Add i2c MCU fan node
.../bindings/i2c/amlogic,meson6-i2c.yaml | 13 ++-
.../devicetree/bindings/mfd/khadas,mcu.yaml | 5 +
.../dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts | 13 +++
arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi | 20 ++++
drivers/mfd/khadas-mcu.c | 106 ++++++++++++++++++---
drivers/thermal/khadas_mcu_fan.c | 43 +++++++--
include/linux/mfd/khadas-mcu.h | 39 +++++++-
7 files changed, 216 insertions(+), 23 deletions(-)
---
base-commit: f7b64ed948718290209074a50bb0df17e5944873
change-id: 20260402-add-mcu-fan-khadas-vim4-ac1cbe553c9b
prerequisite-message-id: <20260326092645.1053261-1-jian.hu@xxxxxxxxxxx>
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prerequisite-patch-id: 57e9b08a968aedf543d3d0d56cf1ca4db20b2a16
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prerequisite-patch-id: 57e9b08a968aedf543d3d0d56cf1ca4db20b2a16
prerequisite-patch-id: cd98b74fa56af72af2553f391c400981d83cd4f4
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prerequisite-patch-id: 9debd88fa60febed9cd7208f86603b4c2d270520
prerequisite-patch-id: 314ef9ff0c4d1d15dab1dea9d92aa065f1eac3e9
Best regards,
--
Ronald Claveau <linux-kernel-dev@xxxxxxxx>