UM0851 datasheet(218/245 Pages) STMICROELECTRONICS

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Miscellaneous device drivers

UM0851

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Doc ID 16604 Rev 2

Label: is a string passed by user as a unique identification of user.

struct pwm_device: is local to pwm driver. Its internals are not for user

driver. Only pointer to this must be saved for any future communication

with PWM driver.*/

struct pwm_device *pwm_request(int pwm_id, const char *label);

This function returns pointer to struct pwm_device structure if the PWM channel is free,

otherwise errno is returned.

Configure

The user driver must configure the PWM channel with required duty and period in

nanoseconds. This is done using the following function call.

/* pwm: is pointer to channel previously allocated.

duty_ns: is duty in nanoseconds.

period_ns: is period in nanoseconds. */

int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);

It returns zero on success otherwise errno is returned.

12.936 sec >= period_ns > 12 nsec

period_ns >= duty_ns > 12 nsec

Enable

After configuring the PWM channel, it must be enabled. This is done using the following

function call.

/* pwm: is pointer to channel previously allocated. */

int pwm_enable(struct pwm_device *pwm);

It returns zero on success otherwise errno is returned.

Disable

After using the PWM channel, it must be disabled. This is done using the following function

call.

/* pwm: is pointer to channel previously allocated. */

void pwm_disable(struct pwm_device *pwm);

Free

The PWM channel must be freed, once it is used. This can be done using the following

function call.

/* Pwm: is pointer to channel previously allocated. */

void pwm_free(struct pwm_device *pwm);

9.3.4

Configuration options

Table 58.

SDIO menuconfig kernel options

Configuration option

Comment

CONFIG_ SPEAR_PWM

This option enables SPEAr PWM driver.

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