linux-kernel - Re: [PATCH V3] pwm: lpc32xx - Add a driver for the motor PWM

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Date:	Wed, 10 Sep 2014 11:21:29 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Alban Bedel <alban.bedel@...onic-design.de>
Cc:	Mark Rutland <mark.rutland@....com>,
	Thierry Reding <thierry.reding@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Pawel Moll <Pawel.Moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Roland Stigge <stigge@...com.de>
Subject: Re: [PATCH V3] pwm: lpc32xx - Add a driver for the motor PWM

On Wednesday 10 September 2014 10:42:20 Alban Bedel wrote:
> 
> > Please describe clocks in the binding. If the clock inputs are named,
> > please use clock-names.
> 
> No clock is defined in the current LPC32xx DTS, what should I do in
> this case?

This is a bit tricky. I would recommend describing the clock inputs
in the binding anyway, as "optional" properties, in case we ever get
a full DT-aware clocksource driver for lpc32xx.

I've just mentioned the topic to Roland yesterday, I would really
like to see such a clocksource driver done for other reasons
(multiplatform support), but introducing one with full DT support
is hard to do without breaking existing dtb files.

	Arnd
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