Messages in this thread | | | From | Rob Herring <> | Date | Fri, 16 Apr 2021 10:39:12 -0500 | Subject | Re: [PATCH v8 4/8] dt-bindings: pwm: Support new PWM_USAGE_POWER flag |
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On Fri, Apr 16, 2021 at 8:54 AM Thierry Reding <thierry.reding@gmail.com> wrote: > > On Mon, Apr 12, 2021 at 03:27:41PM +0200, Clemens Gruber wrote: > > Add the flag and corresponding documentation for PWM_USAGE_POWER. > > > > Cc: Rob Herring <robh+dt@kernel.org> > > Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com> > > --- > > Documentation/devicetree/bindings/pwm/pwm.txt | 3 +++ > > include/dt-bindings/pwm/pwm.h | 1 + > > 2 files changed, 4 insertions(+) > > Rob, what are your thoughts on this? I've been thinking about this some > more and I'm having second thoughts about putting this into device tree > because it doesn't actually describe a property of the PWM hardware but > rather a use-case specific hint. It's a bit of a gray area because this > is just part of the PWM specifier which already has use-case specific > "configuration", such as the period and the polarity.
I'm pretty neutral. My main hesitation from what I've followed is 'power' seems a bit indirect. A PWM signal doesn't have a 'power' any more than a GPIO signal does.
> Perhaps a better place for this is within the PWM API? We could add the > same information into struct pwm_state and then consumers that don't > care about specifics of the signal (such as pwm-backlight) can set that > flag when they request a state to be applied.
Yeah, seems like this is fairly well tied to the class of consumer.
Rob
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