linux-kernel - Re: [PATCH] i2c-ocores: add common clock support

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Message-ID: <20150122192649.GC14880@katana>
Date:	Thu, 22 Jan 2015 20:26:49 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Max Filippov <jcmvbkbc@...il.com>
Cc:	Peter Korsgaard <peter@...sgaard.com>,
	Peter Korsgaard <jacmet@...site.dk>, linux-i2c@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c-ocores: add common clock support

On Thu, Jan 22, 2015 at 10:15:40PM +0300, Max Filippov wrote:
> On Thu, Jan 22, 2015 at 9:57 PM, Wolfram Sang <wsa@...-dreams.de> wrote:
> > My suggestion is:
> >
> > 1) if there is a clk node:
> >         - we get the clock rate via clock framework
> >         - "clock-frequency" is describing the bus speed as usual (Note
> >           that parsing here can be as simple as checking for 100kHz only.
> >           Although a seperate patch could probably easily add support for
> >           other bus speeds to)
> >
> > 2?) a new binding is present to specify the IP clock speed:
> >         - is this needed? is somebody using the driver without CCF?
> >         - if so, the new binding is parsed and evaluated
> >         - I couldn't find an existing binding to specify a clock speed.
> >           Please have a look, too. Otherwise we need to introduce sth
> >           like "opencores,ip-clock-khz" probably.
> >         - "clock-frequency" is describing the bus speed as usual
> >
> > 3) only "clock-frequency" is present:
> >         - we keep the current behaviour to be backwards compatible.
> >         - driver should emit a warning to convert to new style
> >         - must be marked deprecated everywhere
> >
> > The documentation should be updated accordingly.
> >
> > Thoughts?
> 
> I can update my patch to do (1) and (3), leaving (2) to whoever may
> need that.

Please implement (2) as well. Otherwise we would have documented
ambiguity of "clock-frequency" which is bad. It shouldn't be much code.


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