On Thu, Aug 06, 2015 at 05:55:57PM -0700, Florian Fainelli wrote: > Add a binding documentation for the Broadcom BCM7038 PWM controller found in > BCM7xxx chips. > > Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx> > --- > .../devicetree/bindings/pwm/brcm,bcm7038-pwm.txt | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pwm/brcm,bcm7038-pwm.txt > > diff --git a/Documentation/devicetree/bindings/pwm/brcm,bcm7038-pwm.txt b/Documentation/devicetree/bindings/pwm/brcm,bcm7038-pwm.txt > new file mode 100644 > index 000000000000..8b9bc43b561e > --- /dev/null > +++ b/Documentation/devicetree/bindings/pwm/brcm,bcm7038-pwm.txt > @@ -0,0 +1,22 @@ > +Broadcom BCM7038 PWM controller (BCM7xxx Set Top Box PWM controller) > + > +Required properties: > + > +- compatible: must be "brcm,bcm7038-pwm" > +- reg: physical base address and length for this controller > +- #pwm-cells: should be 2. See pwm.txt in this directory for a description > + of the cells format. > + > +Optional properties: > + > +- clocks: a phandle to the reference clock for this block which is fed through > + its internal variable clock frequency generator Why is this optional? I would assume that the hardware always needs some sort of reference clock to properly function. Thierry
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