.. SPDX-License-Identifier: GPL-2.0 Kernel driver axiado-pwm-fan ============================ Supported chips: * Axiado AX3000 * Axiado AX3005 Datasheet: Not publicly available Author: * Petar Stepanovic Description ----------- The Axiado AX3000 and AX3005 PWM fan controllers measure the rotational speed of one fan using a hardware tachometer block. Fan speed is controlled through a PWM signal supplied by an external PWM controller. The number of tachometer pulses generated per fan revolution is configured through the ``pulses-per-revolution`` devicetree property. If the property is not specified, the driver uses two pulses per revolution. Sysfs attributes ---------------- The driver provides the following standard hwmon attributes: =============== ====== ===================================================== fan1_input RO Fan speed in revolutions per minute (RPM). pwm1 RW Relative PWM control value from 0 to 255. A value of 255 selects the maximum PWM duty cycle. =============== ====== =====================================================