Contrary to the gpio-fan the pwm-fan driver isn't easy to setup with pwmconfig/fancontrol because of the missing hwmon sysfs entry for actual revolutions per minute. This series adds this feature. Changes in V5: - address Guenter's and Robin's comments: - use of_property_read_u32 to get pulses-per-revolution - call platform_get_irq ealier to avoid glitches on the regulator - simplify pwm_fan_attrs_visible Changes in V4: - remove copy & paste artifact in dt-binding example - switch to u64 for rpm calculation - drop overflow handling and init atomic - handle 0 not as valid irq - reduce range of pulses_per_revolution - handle probe defer of platform_get_irq - delete timer properly in bail-out path Changes in V3: - rename property interrupt-ratio to pulses-per-revolution to avoid confusion with interrupt binding - handle error case pulses-per-revolution = 0 - bail out properly in case we are unable to request the irq Changes in V2: - address Guenter's comments: - improve description of interrupts - use atomic_t to avoid races of the pulse counter - measure sample time to make rpm more reliable under load - make sysfs entry fan1_input conditional - add dt-property to define interrupts per fan revolution - example for fan with RPM support Stefan Wahren (3): dt-bindings: hwmon: Add tachometer interrupt to pwm-fan Documentation: pwm-fan: Add description for RPM support hwmon: pwm-fan: Add RPM support via external interrupt .../devicetree/bindings/hwmon/pwm-fan.txt | 21 +++- Documentation/hwmon/pwm-fan | 3 + drivers/hwmon/pwm-fan.c | 107 ++++++++++++++++++++- 3 files changed, 126 insertions(+), 5 deletions(-) -- 2.7.4
