| .. SPDX-License-Identifier: GPL-2.0-only |
| |
| Kernel driver sl28cpld |
| ====================== |
| |
| Supported chips: |
| |
| * Kontron sl28cpld |
| |
| Prefix: 'sl28cpld' |
| |
| Datasheet: not available |
| |
| Authors: Michael Walle <michael@walle.cc> |
| |
| 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. |
| ======================= ======================================================== |
