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 ======================= ========================================================
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