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author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2019-05-31 18:54:58 +0900 |
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committer | Thierry Reding <thierry.reding@gmail.com> | 2019-06-26 11:39:11 +0200 |
commit | 321a7cea973b4f63bb7e3baaea8428dfb8b424a9 (patch) | |
tree | 47376820f70045bdf4cc813ee08a78abda544714 /Documentation | |
parent | 4ae42ce793a755decb2c5978623e56edfdf3ab39 (diff) | |
download | linux-321a7cea973b4f63bb7e3baaea8428dfb8b424a9.tar.bz2 |
pwm: Add power management descriptions
This patch adds power management descriptions that consumers should
implement it.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/pwm.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/pwm.txt b/Documentation/pwm.txt index 8fbf0aa3ba2d..ab62f1bb0366 100644 --- a/Documentation/pwm.txt +++ b/Documentation/pwm.txt @@ -65,6 +65,10 @@ period). struct pwm_args contains 2 fields (period and polarity) and should be used to set the initial PWM config (usually done in the probe function of the PWM user). PWM arguments are retrieved with pwm_get_args(). +All consumers should really be reconfiguring the PWM upon resume as +appropriate. This is the only way to ensure that everything is resumed in +the proper order. + Using PWMs with the sysfs interface ----------------------------------- @@ -141,6 +145,9 @@ The implementation of ->get_state() (a method used to retrieve initial PWM state) is also encouraged for the same reason: letting the PWM user know about the current PWM state would allow him to avoid glitches. +Drivers should not implement any power management. In other words, +consumers should implement it as described in the "Using PWMs" section. + Locking ------- |