Hi Stephen, On Fri, Sep 21, 2012 at 10:46:45, Stephen Warren wrote: > On 09/20/2012 10:51 PM, Philip, Avinash wrote: > > Some backlights perform poorly when driven by a PWM with a short > > duty-cycle. For such devices, the low threshold can be used to specify a > > lower bound for the duty-cycle and should be chosen to exclude the > > problematic range. > > > > This patch adds support for an optional low-threshold-brightness > > property. > > > diff --git a/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt b/Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt > > > Optional properties: > > - pwm-names: a list of names for the PWM devices specified in the > > "pwms" property (see PWM binding[0]) > > + - low-threshold-brightness: brightness threshold low level. Low threshold > > + brightness set to value so that backlight present on low end of > > + brightness. > > For my education, why not just specify values above this value in the > brightness-levels array; how do those two interact? Please find details from https://lkml.org/lkml/2012/7/18/284 Thanks Avinash > It seems like any > description of that is missing from the PWM documentation, and would be > good to have in the DT binding too. > > -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
