sl28cpld.rst 1.0 KB

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  1. .. SPDX-License-Identifier: GPL-2.0-only
  2. Kernel driver sl28cpld
  3. ======================
  4. Supported chips:
  5. * Kontron sl28cpld
  6. Prefix: 'sl28cpld'
  7. Datasheet: not available
  8. Authors: Michael Walle <michael@walle.cc>
  9. Description
  10. -----------
  11. The sl28cpld is a board management controller which also exposes a hardware
  12. monitoring controller. At the moment this controller supports a single fan
  13. supervisor. In the future there might be other flavours and additional
  14. hardware monitoring might be supported.
  15. The fan supervisor has a 7 bit counter register and a counter period of 1
  16. second. If the 7 bit counter overflows, the supervisor will automatically
  17. switch to x8 mode to support a wider input range at the loss of
  18. granularity.
  19. Sysfs entries
  20. -------------
  21. The following attributes are supported.
  22. ======================= ========================================================
  23. fan1_input Fan RPM. Assuming 2 pulses per revolution.
  24. ======================= ========================================================