From: Changhuang Liang <changhuang.liang@starfivetech.com>
To: Guenter Roeck <linux@roeck-us.net>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org,
devicetree@vger.kernel.org,
Changhuang Liang <changhuang.liang@starfivetech.com>
Subject: [PATCH v2 0/2] Add JHB100 Fan-Tach support
Date: Wed, 19 Aug 2026 02:15:59 -0700 [thread overview]
Message-ID: <20260819091601.41077-1-changhuang.liang@starfivetech.com> (raw)
StarFive Fan-Tach controller can support up to 16 fan tach input.
The series has been tested on the EVB1 board.
Change since v1:
PATCH 1:
- Add explicit minItems/maxItems and range constraints for tach-ch.
- Switch fan node regex to support hex addresses.
- Add pulses-per-revolution demo.
- Rename example node to fan-controller for consistency.
- Limit the reg property to a maximum value of 15
- Fix tach-ch example by changing /bits/ 8 <0x0>, <0x8> to
/bits/ 8 <0x0 0x8> so both values are parsed as 8-bit cells.
PATCH 2:
- Added hwmon documentation (starfive-fan-tach.rst)
- Added HAS_IOMEM dependency in Kconfig
- Added per-channel pulses-per-revolution DT property (default 2, range 1-4)
- Added mutex and spinlock for proper concurrency protection
- Added armed_stall/armed_slow mechanism to prevent spurious interrupts
- Added retry logic for zero sampling value in rpm read
- Improved probe sequence: clock enable before reset deassert
- Added devm action for remove path cleanup
- Added input validation for write operations
- Added MODULE_DEVICE_TABLE
- Added linux-hwmon mailing list to MAINTAINERS
v1: https://lore.kernel.org/all/20260428082337.743546-1-changhuang.liang@starfivetech.com/
Changhuang Liang (2):
dt-bindings: hwmon: Add starfive,jhb100-fan-tach
hwmon: (starfive-fan-tach) Add fan tach driver for StarFive JHB100
.../hwmon/starfive,jhb100-fan-tach.yaml | 93 +++
Documentation/hwmon/index.rst | 1 +
Documentation/hwmon/starfive-fan-tach.rst | 34 ++
MAINTAINERS | 8 +
drivers/hwmon/Kconfig | 14 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/starfive-fan-tach.c | 561 ++++++++++++++++++
7 files changed, 712 insertions(+)
create mode 100644 Documentation/devicetree/bindings/hwmon/starfive,jhb100-fan-tach.yaml
create mode 100644 Documentation/hwmon/starfive-fan-tach.rst
create mode 100644 drivers/hwmon/starfive-fan-tach.c
--
2.25.1
next reply other threads:[~2026-08-19 9:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-19 9:15 Changhuang Liang [this message]
2026-08-19 9:16 ` [PATCH v2 1/2] dt-bindings: hwmon: Add starfive,jhb100-fan-tach Changhuang Liang
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