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diff --git a/Documentation/hwmon/emc2305.rst b/Documentation/hwmon/emc2305.rst new file mode 100644 index 0000000000..2403dbaf27 --- /dev/null +++ b/Documentation/hwmon/emc2305.rst @@ -0,0 +1,37 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver emc2305 +===================== + +Supported chips: + Microchip EMC2305, EMC2303, EMC2302, EMC2301 + + Addresses scanned: I2C 0x27, 0x2c, 0x2d, 0x2e, 0x2f, 0x4c, 0x4d + Prefixes: 'emc2305' + + Datasheet: Publicly available at the Microchip website : + https://www.microchip.com/en-us/product/EMC2305 + +Description: +------------ +This driver implements support for Microchip EMC2301/2/3/5 RPM-based PWM Fan Controller. +The EMC2305 Fan Controller supports up to 5 independently controlled PWM fan drives. +Fan rotation speeds are reported in RPM. +The driver supports the RPM-based PWM control to keep a fan at the desired speed. +The driver provides the possibility to have one common PWM interface for all FANs +or up to the maximum available or configured independent PWMs. + +The driver provides the following sysfs interfaces in hwmon subsystem: + +================= == =================================================== +fan[1-5]_fault RO files for tachometers TACH1-TACH5 fault indication +fan[1-5]_input RO files for tachometers TACH1-TACH5 input (in RPM) +pwm[1-5] RW file for fan[1-5] target duty cycle (0..255) +================= == =================================================== + +sysfs interfaces in thermal subsystem: + +================= == ======================================================================== +cur_state RW file for the current cooling state of the cooling device (0..max_state) +max_state RO file for the maximum cooling state of the cooling device +================= == ======================================================================== |