Blackbird™ Linux sources for OpenPOWER https://git.raptorcs.com/git/blackbird-op-linux/atom?h=master 2016-06-10T14:01:40+00:00 2016-06-10T14:01:40+00:00 Lee Jones lee.jones@linaro.org 2016-06-08T09:21:25+00:00 urn:sha1:1a366fe9153f445e950a7a344932b7419aa83094 Allow a user to read PWM capture results from sysfs. To start a capture and read the result, simply read the file: $ cat $PWMCHIP/capture The output format is "<period> <duty cycle>". Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com> 2013-06-21T09:32:51+00:00 H Hartley Sweeten hartleys@visionengravers.com 2013-06-11T17:38:59+00:00 urn:sha1:76abbdde2d95a3807d0dc6bf9f84d03d0dbd4f3d Add a simple sysfs interface to the generic PWM framework. /sys/class/pwm/ `-- pwmchipN/ for each PWM chip |-- export (w/o) ask the kernel to export a PWM channel |-- npwm (r/o) number of PWM channels in this PWM chip |-- pwmX/ for each exported PWM channel | |-- duty_cycle (r/w) duty cycle (in nanoseconds) | |-- enable (r/w) enable/disable PWM | |-- period (r/w) period (in nanoseconds) | `-- polarity (r/w) polarity of PWM (normal/inversed) `-- unexport (w/o) return a PWM channel to the kernel Based on work by Lars Poeschel. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Lars Poeschel <poeschel@lemonage.de> Cc: Ryan Mallon <rmallon@gmail.com> Cc: Rob Landley <rob@landley.net> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>