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

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Message-ID: <20150122204147.GA16770@katana>
Date:	Thu, 22 Jan 2015 21:41:47 +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 11:36:25PM +0300, Max Filippov wrote:
> On Thu, Jan 22, 2015 at 9:57 PM, Wolfram Sang <wsa@...-dreams.de> wrote:
> > 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
> 
> ePAPR document says that clock-frequency 'specifies the frequency
> of a clock in Hz', not identifying which clock. Outside i2c drivers
> subtree it is commonly used to specify input clock frequency of IP
> blocks, even for bus controllers, e.g. SPI.

I know; it was established in I2C this way before I took over.
I don't think it is a good idea to change that.


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