On Fri, Nov 18, 2016 at 08:05:55PM +0530, Laxman Dewangan wrote: > Some PWM regulator has the exponential transition in voltage change as > opposite to fixed slew-rate linear transition on other regulators. > For such PWM regulators, add the property to tell that voltage change > is exponential and having fixed delay for any level of change. > > Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx> > CC: Douglas Anderson <dianders@xxxxxxxxxxxx> > CC: Aleksandr Frid <afrid@xxxxxxxxxx> > > --- > This patch is continuation of discussion on patch > regulator: pwm: Fix regulator ramp delay for continuous mode > https://patchwork.kernel.org/patch/9216857/ > where is it discussed to have separate property for PWM which has > exponential voltage transition. > > Changes from V1: > - Pass the flag to tell that voltage ramp is exponential instead of > providing delay. > --- > .../devicetree/bindings/regulator/pwm-regulator.txt | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt > index 3aeba9f..2d9ef3a 100644 > --- a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt > +++ b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt > @@ -54,6 +54,18 @@ Optional properties: > -------------------- > - enable-gpios: GPIO to use to enable/disable the regulator > > +- voltage-ramp-exponential: Boolean, Some of PWM regulator has the exponential > + transition in voltage ramp as opposite to fixed > + slew-rate linear transition on other regulators. > + For such PWM regulator, presence of this property will > + tell that value of the regulator ramp delay provided by > + DT property "regulator-ramp-delay" is exponential and > + fixed delay for any voltage level change. > + If PWM regulator supports the fixed linear slew rate > + then this property should be absent from DT node and > + property "regulator-ramp-delay" is used as linear slew > + rate. Sorry, but on further thought, I don't think we should mix different units for the same property. Also, the fact that the ramp is exponential is irrelevant. You just want an absolute delay time rather than a rate, right? So instead, how about just "regulator-ramp-time-us". Roughly what you had in v1, but not PWM specific. Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
