linux-kernel - Re: [PATCH 1/2] watchdog: bcm7038: add device tree binding documentation

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Message-ID: <20150825190448.GA29547@roeck-us.net>
Date:	Tue, 25 Aug 2015 12:04:48 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Justin Chen <justinpopo6@...il.com>
Cc:	linux-kernel@...r.kernel.org, feedback-list@...adcom.com,
	devicetree@...r.kernel.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, wim@...ana.be, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH 1/2] watchdog: bcm7038: add device tree binding
 documentation

Justin,

On Tue, Aug 25, 2015 at 10:55:40AM -0700, Justin Chen wrote:
> 
> Hello Guenter,
> 
> > Is 'clock-frequency' really needed (and useful), or would it make more sense
> > to expect the user to configure a fixed clock if nothing else is available ?
> > How do other drivers handle this ?
> 
> The reason for 'clock-frequency' was for a case where our device tree did not
> have clocks. Creating a new fixed clock for a single device seems unnecessary
> compared to a 'clock-frequency' property. Their is a use for 'clock-frequency',
> but it is not really necessary. However, this is my first linux patch, so I do 
> not fully trust my judgement on this...
> 

All that is needed for a fixed clock is a devicetree entry for it. Not sure
I understand your line of argument; you add a lot of complexity and code
just to avoid those few lines in the dts file (especially with 500+
"fixed-clock" nodes in other devicetree files).

Thanks,
Guenter
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