Exploring PWM Subsystem and its Usage in Embedded Devices
summary
Concrete walkthrough of the Linux PWM subsystem with function names, data structures and a working example: shows generic APIs (pwm_get / pwm_put, pwm_apply_state) versus legacy Samsung driver in drivers/pwm/pwm-samsung.c and points out deprecated calls (pwm_request / pwm_free). Explains sysfs control at sys/class/pwm/pwmchip0 with export/period/duty/enable, describes devm_of_node variants, PWM state/args structs, and real use cases (fans, LEDs, vibrator, motors) so viewers who need driver code and commands will benefit.
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chapters (6)
- 0:00Intro
- 1:24Introduction to PWM
- 9:31Generic PWM Framework
- 20:55Legacy PWM Driver Implementation
- 26:10Using PWM Subsystem with systs interface
- 35:00Use-Cases of PWM
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