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pwm: Drop support for legacy drivers

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There are no drivers left providing the legacy callbacks. So drop
support for these.

If this commit breaks your out-of-tree pwm driver, look at e.g. commit
ec00cd5e63 ("pwm: renesas-tpu: Implement .apply() callback") for an
example of the needed conversion for your driver.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2022-05-21 13:02:03 +02:00 committed by Thierry Reding
parent f2906aa863
commit 0829c35dc5
2 changed files with 1 additions and 93 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

82
drivers/pwm/core.c
View File

@ -235,18 +235,8 @@ EXPORT_SYMBOL_GPL(pwm_get_chip_data);
static bool pwm_ops_check(const struct pwm_chip *chip)
{
const struct pwm_ops *ops = chip->ops;
/* driver supports legacy, non-atomic operation */
if (ops->config && ops->enable && ops->disable) {
if (IS_ENABLED(CONFIG_PWM_DEBUG))
dev_warn(chip->dev,
"Driver needs updating to atomic API\n");
return true;
}
if (!ops->apply)
return false;
@ -548,73 +538,6 @@ static void pwm_apply_state_debug(struct pwm_device *pwm,
}
}
static int pwm_apply_legacy(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
int err;
struct pwm_state initial_state = pwm->state;
if (state->polarity != pwm->state.polarity) {
if (!chip->ops->set_polarity)
return -EINVAL;
/*
* Changing the polarity of a running PWM is only allowed when
* the PWM driver implements ->apply().
*/
if (pwm->state.enabled) {
chip->ops->disable(chip, pwm);
/*
* Update pwm->state already here in case
* .set_polarity() or another callback depend on that.
*/
pwm->state.enabled = false;
}
err = chip->ops->set_polarity(chip, pwm, state->polarity);
if (err)
goto rollback;
pwm->state.polarity = state->polarity;
}
if (!state->enabled) {
if (pwm->state.enabled)
chip->ops->disable(chip, pwm);
return 0;
}
/*
* We cannot skip calling ->config even if state->period ==
* pwm->state.period && state->duty_cycle == pwm->state.duty_cycle
* because we might have exited early in the last call to
* pwm_apply_state because of !state->enabled and so the two values in
* pwm->state might not be configured in hardware.
*/
err = chip->ops->config(pwm->chip, pwm,
state->duty_cycle,
state->period);
if (err)
goto rollback;
pwm->state.period = state->period;
pwm->state.duty_cycle = state->duty_cycle;
if (!pwm->state.enabled) {
err = chip->ops->enable(chip, pwm);
if (err)
goto rollback;
}
return 0;
rollback:
pwm->state = initial_state;
return err;
}
/**
* pwm_apply_state() - atomically apply a new state to a PWM device
* @pwm: PWM device
@ -647,10 +570,7 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
state->usage_power == pwm->state.usage_power)
return 0;
if (chip->ops->apply)
err = chip->ops->apply(chip, pwm, state);
else
err = pwm_apply_legacy(chip, pwm, state);
err = chip->ops->apply(chip, pwm, state);
if (err)
return err;

12
include/linux/pwm.h
View File

@ -261,10 +261,6 @@ pwm_set_relative_duty_cycle(struct pwm_state *state, unsigned int duty_cycle,
* called once per PWM device when the PWM chip is
* registered.
* @owner: helps prevent removal of modules exporting active PWMs
* @config: configure duty cycles and period length for this PWM
* @set_polarity: configure the polarity of this PWM
* @enable: enable PWM output toggling
* @disable: disable PWM output toggling
*/
struct pwm_ops {
int (*request)(struct pwm_chip *chip, struct pwm_device *pwm);
@ -276,14 +272,6 @@ struct pwm_ops {
void (*get_state)(struct pwm_chip *chip, struct pwm_device *pwm,
struct pwm_state *state);
struct module *owner;
/* Only used by legacy drivers */
int (*config)(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns);
int (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm,
enum pwm_polarity polarity);
int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm);
void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm);
};
/**