linux-kernel - Re: [PATCH] clk: add flags to distinguish xtal clocks

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Date:	Mon, 11 Nov 2013 21:54:01 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Felipe Balbi <balbi@...com>
Cc:	mturquette@...aro.org, james.hogan@...tec.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	luca@...lho.fi,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] clk: add flags to distinguish xtal clocks

On Mon, Nov 11, 2013 at 01:42:47PM -0600, Felipe Balbi wrote:
> > > +	if (of_property_read_bool(node, "clock-xtal"))
> > > +		flags |= CLK_IS_TYPE_XTAL;
> > > +
> > 
> > Introducing a new compatible instead of a property would make more
> > sense here I think.
> > 
> > Do you have a reason not to do so?
> 
> As you can see, this is original work from Luca but I disagree that
> adding a new compatible makes more sense. This still related to a fixed
> rate clock, we're just giving it one extra metadata which will
> differentiate between crystal and oscilator fixed rate clocks.

I don't know, I think it's more a matter of consistency.

If we turn the problem the other way around. Let's say we have a
crystal that for some reason can't be used with clk-fixed-rate. You'd
add a new driver for it, with a compatible of its own, and you'd put
that XTAL flag in there, without any extra metadata in the DT, right?

And I'm pretty sure having a compatible like "clk-xtal" would make it
pretty obvious that it's still a fixed rate clock.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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