Re: [PATCH 1/2] Documentation: dt: add Broadcom BCM7038 PWM controller binding

[Thierry Reding]

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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