linux-kernel - Re: [PATCH] Documentation: dt: bindings: TI WiLink modules

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Message-ID: <1374306488.8385.56.camel@cumari.coelho.fi>
Date:	Sat, 20 Jul 2013 10:48:08 +0300
From:	Luciano Coelho <coelho@...com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:	<mturquette@...aro.org>, Mark Rutland <mark.rutland@....com>,
	<balbi@...com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-arm@...r.kernel.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] Documentation: dt: bindings: TI WiLink modules

On Thu, 2013-07-18 at 01:58 +0200, Laurent Pinchart wrote:
> Hi Luciano,

Hi Laurent,

> On Monday 01 July 2013 15:39:30 Luciano Coelho wrote:
> > The only thing I can come up with is to make a small clock driver (maybe
> > even inside the WiLink module itself) that registers a new type of
> > clock, "ti,wilink-clock" or something.  But this would really be
> > overkill, wouldn't it?
> > 
> > Any other ideas?
> 
> One possibility would be to just call clk_get_rate() on the clock from the 
> WiLink driver, which would return the fixed frequency specified in DT, and 
> configure the WiLink hardware accordingly. This might be a bit hackish though.

The problem is not get the rate itself, the problem is knowing whether
the clock is XTAL or not.  The WiLink chip uses the clock in a slightly
different way if it is XTAL, due to some stabilization time constraints.

--
Luca.

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