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

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Message-ID: <20150817144947.GG6891@ulmo.nvidia.com>
Date:	Mon, 17 Aug 2015 16:49:49 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	bcm-kernel-feedback-list@...adcom.com,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"open list:PWM SUBSYSTEM" <linux-pwm@...r.kernel.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] Documentation: dt: add Broadcom BCM7038 PWM
 controller binding

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@...il.com>
> ---
>  .../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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