| What: /sys/class/pwm/ |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| The pwm/ class sub-directory belongs to the Generic PWM |
| Framework and provides a sysfs interface for using PWM |
| channels. |
| |
| What: /sys/class/pwm/pwmchipN/ |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| A /sys/class/pwm/pwmchipN directory is created for each |
| probed PWM controller/chip where N is the base of the |
| PWM chip. |
| |
| What: /sys/class/pwm/pwmchipN/npwm |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| The number of PWM channels supported by the PWM chip. |
| |
| What: /sys/class/pwm/pwmchipN/export |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| Exports a PWM channel from the PWM chip for sysfs control. |
| Value is between 0 and /sys/class/pwm/pwmchipN/npwm - 1. |
| |
| What: /sys/class/pwm/pwmchipN/unexport |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| Unexports a PWM channel. |
| |
| What: /sys/class/pwm/pwmchipN/pwmX |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| A /sys/class/pwm/pwmchipN/pwmX directory is created for |
| each exported PWM channel where X is the exported PWM |
| channel number. |
| |
| What: /sys/class/pwm/pwmchipN/pwmX/period |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| Sets the PWM signal period in nanoseconds. |
| |
| What: /sys/class/pwm/pwmchipN/pwmX/duty_cycle |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| Sets the PWM signal duty cycle in nanoseconds. |
| |
| What: /sys/class/pwm/pwmchipN/pwmX/polarity |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| Sets the output polarity of the PWM signal to "normal" or |
| "inversed". |
| |
| What: /sys/class/pwm/pwmchipN/pwmX/enable |
| Date: May 2013 |
| KernelVersion: 3.11 |
| Contact: H Hartley Sweeten <hsweeten@visionengravers.com> |
| Description: |
| Enable/disable the PWM signal. |
| 0 is disabled |
| 1 is enabled |
| |
| What: /sys/class/pwm/pwmchipN/pwmX/capture |
| Date: June 2016 |
| KernelVersion: 4.8 |
| Contact: Lee Jones <lee.jones@linaro.org> |
| Description: |
| Capture information about a PWM signal. The output format is a |
| pair unsigned integers (period and duty cycle), separated by a |
| single space. |
