projects / linux-block.git / blame
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|---|---|---|
| 3f697027 MW |
1 | .. SPDX-License-Identifier: GPL-2.0-only |
| 2 | ||
| 3 | Kernel driver sl28cpld | |
| 4 | ====================== | |
| 5 | ||
| 6 | Supported chips: | |
| 7 | ||
| 8 | * Kontron sl28cpld | |
| 9 | ||
| 10 | Prefix: 'sl28cpld' | |
| 11 | ||
| 12 | Datasheet: not available | |
| 13 | ||
| 14 | Authors: Michael Walle <michael@walle.cc> | |
| 15 | ||
| 16 | Description | |
| 17 | ----------- | |
| 18 | ||
| 19 | The sl28cpld is a board management controller which also exposes a hardware | |
| 20 | monitoring controller. At the moment this controller supports a single fan | |
| 21 | supervisor. In the future there might be other flavours and additional | |
| 22 | hardware monitoring might be supported. | |
| 23 | ||
| 24 | The fan supervisor has a 7 bit counter register and a counter period of 1 | |
| 25 | second. If the 7 bit counter overflows, the supervisor will automatically | |
| 26 | switch to x8 mode to support a wider input range at the loss of | |
| 27 | granularity. | |
| 28 | ||
| 29 | Sysfs entries | |
| 30 | ------------- | |
| 31 | ||
| 32 | The following attributes are supported. | |
| 33 | ||
| 34 | ======================= ======================================================== | |
| 35 | fan1_input Fan RPM. Assuming 2 pulses per revolution. | |
| 36 | ======================= ======================================================== |