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Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-pwm')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-pwm | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-pwm b/Documentation/ABI/testing/sysfs-class-pwm new file mode 100644 index 000000000000..c479d77b67c5 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-pwm | |||
| @@ -0,0 +1,79 @@ | |||
| 1 | What: /sys/class/pwm/ | ||
| 2 | Date: May 2013 | ||
| 3 | KernelVersion: 3.11 | ||
| 4 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 5 | Description: | ||
| 6 | The pwm/ class sub-directory belongs to the Generic PWM | ||
| 7 | Framework and provides a sysfs interface for using PWM | ||
| 8 | channels. | ||
| 9 | |||
| 10 | What: /sys/class/pwm/pwmchipN/ | ||
| 11 | Date: May 2013 | ||
| 12 | KernelVersion: 3.11 | ||
| 13 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 14 | Description: | ||
| 15 | A /sys/class/pwm/pwmchipN directory is created for each | ||
| 16 | probed PWM controller/chip where N is the base of the | ||
| 17 | PWM chip. | ||
| 18 | |||
| 19 | What: /sys/class/pwm/pwmchipN/npwm | ||
| 20 | Date: May 2013 | ||
| 21 | KernelVersion: 3.11 | ||
| 22 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 23 | Description: | ||
| 24 | The number of PWM channels supported by the PWM chip. | ||
| 25 | |||
| 26 | What: /sys/class/pwm/pwmchipN/export | ||
| 27 | Date: May 2013 | ||
| 28 | KernelVersion: 3.11 | ||
| 29 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 30 | Description: | ||
| 31 | Exports a PWM channel from the PWM chip for sysfs control. | ||
| 32 | Value is between 0 and /sys/class/pwm/pwmchipN/npwm - 1. | ||
| 33 | |||
| 34 | What: /sys/class/pwm/pwmchipN/unexport | ||
| 35 | Date: May 2013 | ||
| 36 | KernelVersion: 3.11 | ||
| 37 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 38 | Description: | ||
| 39 | Unexports a PWM channel. | ||
| 40 | |||
| 41 | What: /sys/class/pwm/pwmchipN/pwmX | ||
| 42 | Date: May 2013 | ||
| 43 | KernelVersion: 3.11 | ||
| 44 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 45 | Description: | ||
| 46 | A /sys/class/pwm/pwmchipN/pwmX directory is created for | ||
| 47 | each exported PWM channel where X is the exported PWM | ||
| 48 | channel number. | ||
| 49 | |||
| 50 | What: /sys/class/pwm/pwmchipN/pwmX/period | ||
| 51 | Date: May 2013 | ||
| 52 | KernelVersion: 3.11 | ||
| 53 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 54 | Description: | ||
| 55 | Sets the PWM signal period in nanoseconds. | ||
| 56 | |||
| 57 | What: /sys/class/pwm/pwmchipN/pwmX/duty_cycle | ||
| 58 | Date: May 2013 | ||
| 59 | KernelVersion: 3.11 | ||
| 60 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 61 | Description: | ||
| 62 | Sets the PWM signal duty cycle in nanoseconds. | ||
| 63 | |||
| 64 | What: /sys/class/pwm/pwmchipN/pwmX/polarity | ||
| 65 | Date: May 2013 | ||
| 66 | KernelVersion: 3.11 | ||
| 67 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 68 | Description: | ||
| 69 | Sets the output polarity of the PWM signal to "normal" or | ||
| 70 | "inversed". | ||
| 71 | |||
| 72 | What: /sys/class/pwm/pwmchipN/pwmX/enable | ||
| 73 | Date: May 2013 | ||
| 74 | KernelVersion: 3.11 | ||
| 75 | Contact: H Hartley Sweeten <hsweeten@visionengravers.com> | ||
| 76 | Description: | ||
| 77 | Enable/disable the PWM signal. | ||
| 78 | 0 is disabled | ||
| 79 | 1 is enabled | ||