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- .. SPDX-License-Identifier: GPL-2.0-only
- Kernel driver sl28cpld
- ======================
- Supported chips:
- * Kontron sl28cpld
- Prefix: 'sl28cpld'
- Datasheet: not available
- Authors: Michael Walle <[email protected]>
- Description
- -----------
- The sl28cpld is a board management controller which also exposes a hardware
- monitoring controller. At the moment this controller supports a single fan
- supervisor. In the future there might be other flavours and additional
- hardware monitoring might be supported.
- The fan supervisor has a 7 bit counter register and a counter period of 1
- second. If the 7 bit counter overflows, the supervisor will automatically
- switch to x8 mode to support a wider input range at the loss of
- granularity.
- Sysfs entries
- -------------
- The following attributes are supported.
- ======================= ========================================================
- fan1_input Fan RPM. Assuming 2 pulses per revolution.
- ======================= ========================================================
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