Re: [PATCH V5 0/3] hwmon: pwm-fan: Add RPM support

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On 4/11/19 6:30 AM, Stefan Wahren wrote:
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.


Series applied to hwmon-next.

Thanks,
Guenter

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(-)





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