0001 .. SPDX-License-Identifier: GPL-2.0-only
0002
0003 Kernel driver sl28cpld
0004 ======================
0005
0006 Supported chips:
0007
0008 * Kontron sl28cpld
0009
0010 Prefix: 'sl28cpld'
0011
0012 Datasheet: not available
0013
0014 Authors: Michael Walle <michael@walle.cc>
0015
0016 Description
0017 -----------
0018
0019 The sl28cpld is a board management controller which also exposes a hardware
0020 monitoring controller. At the moment this controller supports a single fan
0021 supervisor. In the future there might be other flavours and additional
0022 hardware monitoring might be supported.
0023
0024 The fan supervisor has a 7 bit counter register and a counter period of 1
0025 second. If the 7 bit counter overflows, the supervisor will automatically
0026 switch to x8 mode to support a wider input range at the loss of
0027 granularity.
0028
0029 Sysfs entries
0030 -------------
0031
0032 The following attributes are supported.
0033
0034 ======================= ========================================================
0035 fan1_input Fan RPM. Assuming 2 pulses per revolution.
0036 ======================= ========================================================
