pwm_channel Struct Reference

#include <atmel_pwm.h>

Data Fields
void __iomem *	regs
unsigned	index
unsigned long	mck

Detailed Description

struct pwm_channel - driver handle to a PWM channel : base of this channel's registers : number of this channel (0..31) : base clock rate, which can be prescaled and maybe subdivided

Drivers initialize a pwm_channel structure using pwm_channel_alloc(). Then they configure its clock rate (derived from MCK), alignment, polarity, and duty cycle by writing directly to the channel registers, before enabling the channel by calling pwm_channel_enable().

After emitting a PWM signal for the desired length of time, drivers may then pwm_channel_disable() or pwm_channel_free(). Both of these disable the channel, but when it's freed the IRQ is deconfigured and the channel must later be re-allocated and reconfigured.

Note that if the period or duty cycle need to be changed while the PWM channel is operating, drivers must use the PWM_CUPD double buffer mechanism, either polling until they change or getting implicitly notified through a once-per-period interrupt handler.

Definition at line 25 of file atmel_pwm.h.

Field Documentation

unsigned index

Definition at line 27 of file atmel_pwm.h.

unsigned long mck

Definition at line 28 of file atmel_pwm.h.

void __iomem* regs

Definition at line 26 of file atmel_pwm.h.

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The documentation for this struct was generated from the following file:

• include/linux/atmel_pwm.h