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

From: Wolfram Sang
Date: Thu Jan 22 2015 - 14:26:57 EST


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@xxxxxxxxxxxxx> 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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