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Diffstat (limited to 'Documentation/pwm.txt')
| -rw-r--r-- | Documentation/pwm.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt index 93cb97974986..0527f615b115 100644 --- a/Documentation/pwm.txt +++ b/Documentation/pwm.txt @@ -97,6 +97,13 @@ pwm_chip as argument which provides a description of the PWM chip, the number of PWM devices provided by the chip and the chip-specific implementation of the supported PWM operations to the framework. +When implementing polarity support in a PWM driver, make sure to respect the +signal conventions in the PWM framework. By definition, normal polarity +characterizes a signal starts high for the duration of the duty cycle and +goes low for the remainder of the period. Conversely, a signal with inversed +polarity starts low for the duration of the duty cycle and goes high for the +remainder of the period. + Locking ------- |