When requested by a user, the PWM is assigned a default period and polarity
extracted from the DT, the platform data or statically set by the driver.
Those default values are currently stored in the period and polarity
fields of the pwm_device struct, but they will be stored somewhere else
once we have introduced the architecture allowing for hardware state
retrieval.

The pwm_set_default_polarity and pwm_set_default_period should only be
used by PWM drivers or the PWM core infrastructure to specify the
default period and polarity values.

PWM users might call the pwm_get_default_period to query the default
period value. There is currently no helper to query the default
polarity, but it might be added later on if there is a need for it.

This patch also modifies all the places where the default helpers should
be used in place of the standard ones.

Signed-off-by: Boris Brezillon <redacted>
---
  drivers/leds/leds-pwm.c              |  2 +-
  drivers/pwm/core.c                   | 14 +++++++-------
  drivers/pwm/pwm-pxa.c                |  2 +-
  drivers/pwm/pwm-sun4i.c              |  3 ++-
  drivers/regulator/pwm-regulator.c    |  4 ++--
  drivers/video/backlight/lm3630a_bl.c |  4 ++--
  drivers/video/backlight/pwm_bl.c     |  2 +-
  drivers/video/fbdev/ssd1307fb.c      |  2 +-
  include/linux/pwm.h                  | 17 +++++++++++++++++
  9 files changed, 34 insertions(+), 16 deletions(-)

diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
index 1d07e3e..2c564d1 100644
--- a/drivers/leds/leds-pwm.c
+++ b/drivers/leds/leds-pwm.c

@@ -125,7 +125,7 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
  	if (led_data->can_sleep)
  		INIT_WORK(&led_data->work, led_pwm_work);

-	led_data->period = pwm_get_period(led_data->pwm);
+	led_data->period = pwm_get_default_period(led_data->pwm);
  	if (!led_data->period && (led->pwm_period_ns > 0))
  		led_data->period = led->pwm_period_ns;