linux-kernel - Re: [PATCH RFC v4 2/2] clk: Add handling of clk parent and rate assigned from DT

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Message-ID: <20140402080102.GK2931@tbergstrom-lnx.Nvidia.com>
Date:	Wed, 2 Apr 2014 11:01:02 +0300
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Ben Dooks <ben.dooks@...ethink.co.uk>
CC:	Greg KH <gregkh@...uxfoundation.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"mturquette@...aro.org" <mturquette@...aro.org>,
	"t.figa@...sung.com" <t.figa@...sung.com>,
	"sw0312.kim@...sung.com" <sw0312.kim@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"laurent.pinchart@...asonboard.com" 
	<laurent.pinchart@...asonboard.com>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"m.szyprowski@...sung.com" <m.szyprowski@...sung.com>
Subject: Re: [PATCH RFC v4 2/2] clk: Add handling of clk parent and rate
 assigned from DT

On Tue, Apr 01, 2014 at 03:19:40PM +0200, Ben Dooks wrote:
> On 31/03/14 21:06, Greg KH wrote:
> > On Mon, Mar 31, 2014 at 06:41:56PM +0200, Sylwester Nawrocki wrote:
> >> This function adds a helper function to configure clock parents and rates
> >> as specified in clock-parents, clock-rates DT properties for a consumer
> >> device and a call to it before driver is bound to a device.
> >>
> >> Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> 
> [snip]
> 
> >
> > I don't understand why you need the driver core to initialize this one
> > type of thing?  That should be in a driver, or in a class, or at worse
> > case, the platform code.
> >
> > What makes clocks so "unique" here?
> 
> I suppose the issue here is that a lot of drivers currently use
> clocks and a number of systems have badly setup default clock trees
> at start time.
> 
> Mark Brown and others have argued that the management of clocks which
> is common to all devices should not live in the driver.

Exactly, this data should be part of the clock provider DT nodes, not
of the device nodes. 

Cheers,

Peter.
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