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1.. SPDX-License-Identifier: GPL-2.0-only2 3Kernel driver sl28cpld4======================5 6Supported chips:7 8 * Kontron sl28cpld9 10 Prefix: 'sl28cpld'11 12 Datasheet: not available13 14Authors: Michael Walle <michael@walle.cc>15 16Description17-----------18 19The sl28cpld is a board management controller which also exposes a hardware20monitoring controller. At the moment this controller supports a single fan21supervisor. In the future there might be other flavours and additional22hardware monitoring might be supported.23 24The fan supervisor has a 7 bit counter register and a counter period of 125second. If the 7 bit counter overflows, the supervisor will automatically26switch to x8 mode to support a wider input range at the loss of27granularity.28 29Sysfs entries30-------------31 32The following attributes are supported.33 34======================= ========================================================35fan1_input Fan RPM. Assuming 2 pulses per revolution.36======================= ========================================================37