From: Markus Stockhausen <markus.stockhausen@gmx.de>
To: linux@roeck-us.net, robh@kernel.org, krzk+dt@kernel.org,
conor+dt@kernel.org, jdelvare@suse.com,
linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org
Cc: Markus Stockhausen <markus.stockhausen@gmx.de>
Subject: [PATCH 0/2] Support active-high alert polarity for LM75
Date: Fri, 1 May 2026 14:05:16 +0200 [thread overview]
Message-ID: <20260501120518.3085501-1-markus.stockhausen@gmx.de> (raw)
The LM75 configuration register allows to switch the alert polarity.
In default mode the alert output pin is active-low. There are hardware
designs that use this alert output for an hardware assisted automatic
fan speed control. E.g. the D-Link DGS-1250. Implementation is.
- temperature below Tmax threshold -> alert pin low -> fan slow speed
- temperature above Tmax threshold -> alert pin high -> fan high speed
Provide a devicetree configuration option and a driver enhancement to
support these hardware designs.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
next reply other threads:[~2026-05-01 12:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-01 12:05 Markus Stockhausen [this message]
2026-05-01 12:05 ` [PATCH 1/2] dt-bindings: hwmon: lm75: Add lm75,alert-polarity-active-high property Markus Stockhausen
2026-05-03 18:02 ` Conor Dooley
2026-05-01 12:05 ` [PATCH 2/2] hwmon: (lm75) Support active-high alert polarity Markus Stockhausen
2026-05-01 17:05 ` Conor Dooley
2026-05-01 19:32 ` Guenter Roeck
2026-05-03 18:00 ` Conor Dooley
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