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? 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
