linux-toradex.git/include/linux/pwm.h, branch v4.13-rc5

pwm: Try to load modules during pwm_get()

2017-01-30T08:36:42+00:00

Add a module name string to the pwm_lookup struct and if specified try
to load the module using request_module() if pwmchip_find_by_name() is
unable to find the PWM chip.

This is a last resort to work around drivers that can't - and can't be
made to - deal with deferred probe.

Signed-off-by: Hans de Goede 
[thierry.reding@gmail.com: rename new macro, reword commit message]
[thierry.reding@gmail.com: add comment explaining use-case]
Signed-off-by: Thierry Reding

pwm: Remove .can_sleep from struct pwm_chip

2017-01-04T08:40:54+00:00

All PWM devices have been marked as "might sleep" since v4.5, there is
no longer a need to differentiate on a per-chip basis.

Signed-off-by: Thierry Reding

pwm: Remove pwm_can_sleep()

2017-01-04T08:39:52+00:00

The last user of this function has been removed, so it is no longer
needed.

Signed-off-by: Thierry Reding

pwm: Unexport children before chip removal

2016-09-05T14:45:39+00:00

Exported pwm channels aren't removed before the pwmchip and are
leaked. This results in invalid sysfs files. This fix removes
all exported pwm channels before chip removal.

Signed-off-by: David Hsu 
Fixes: 76abbdde2d95 ("pwm: Add sysfs interface")
Signed-off-by: Thierry Reding

Merge branch 'for-4.8/capture' into for-next

2016-07-25T14:23:39+00:00

Merge branch 'for-4.8/core' into for-next

2016-07-25T14:23:37+00:00

pwm: Remove gratuitous blank line

2016-07-08T16:11:51+00:00

Commit 5ec803edcb70 ("pwm: Add core infrastructure to allow atomic
updates") introduced this double blank line by mistake.

Signed-off-by: Thierry Reding

pwm: Add relative duty cycle manipulation helpers

2016-07-08T15:52:19+00:00

The PWM framework expects PWM users to configure the duty cycle in nano-
seconds, but many users want to express the duty cycle relatively to the
period value (i.e. duty_cycle = 33% of the period).

Add the pwm_{get,set}_relative_duty_cycle() helpers to ease this kind of
conversion.

Signed-off-by: Boris Brezillon 
Tested-by: Heiko Stuebner 
Signed-off-by: Thierry Reding

pwm: Add a helper to prepare a new PWM state

2016-07-08T15:52:18+00:00

The pwm_init_state() helper prepares a new state object containing the
current PWM state except for the polarity and period fields which are
set to the reference values (those in struct pwm_args).

This is particularly useful for PWM users who want to apply a new duty-
cycle expressed relatively to the reference period without changing the
enable state.

Signed-off-by: Boris Brezillon 
Tested-by: Heiko Stuebner 
Signed-off-by: Thierry Reding

pwm: Fix pwm_apply_args()

2016-06-23T16:37:05+00:00

Commit 5ec803edcb70 ("pwm: Add core infrastructure to allow atomic
updates"), implemented pwm_disable() as a wrapper around
pwm_apply_state(), and then, commit ef2bf4997f7d ("pwm: Improve args
checking in pwm_apply_state()") added missing checks on the ->period
value in pwm_apply_state() to ensure we were not passing inappropriate
values to the ->config() or ->apply() methods.

The conjunction of these 2 commits led to a case where pwm_disable()
was no longer succeeding, thus preventing the polarity setting done
in pwm_apply_args().

Set a valid period in pwm_apply_args() to ensure polarity setting
won't be rejected.

Signed-off-by: Boris Brezillon 
Reported-by: Geert Uytterhoeven 
Suggested-by: Brian Norris 
Fixes: 5ec803edcb70 ("pwm: Add core infrastructure to allow atomic updates")
Tested-by: Geert Uytterhoeven 
Reviewed-by: Brian Norris 
Signed-off-by: Thierry Reding