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[RFC,V2,0/3] hwmon: pwm-fan: Add RPM support

Message ID 1551110359-19860-1-git-send-email-stefan.wahren@i2se.com (mailing list archive)
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Series hwmon: pwm-fan: Add RPM support | expand

Message

Stefan Wahren Feb. 25, 2019, 3:59 p.m. UTC
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 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          | 19 +++++
 Documentation/hwmon/pwm-fan                        |  3 +
 drivers/hwmon/pwm-fan.c                            | 94 +++++++++++++++++++++-
 3 files changed, 115 insertions(+), 1 deletion(-)