linux-kernel - Re: [PATCH RFC] clk: Introduce userspace clock driver

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Message-ID: <1b69c011-cab5-4fde-a61d-7e2536208920@CH1EHSMHS003.ehs.local>
Date:	Thu, 16 May 2013 11:55:45 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Philip Balister <philip@...ister.org>,
	Saravana Kannan <skannan@...eaurora.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Mike Turquette <mturquette@...aro.org>,
	<linux-kernel@...r.kernel.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH RFC] clk: Introduce userspace clock driver

On Thu, May 16, 2013 at 06:26:05PM +0100, Mark Brown wrote:
> On Thu, May 16, 2013 at 10:44:16AM -0400, Philip Balister wrote:
> > On 05/16/2013 12:28 AM, Saravana Kannan wrote:
> 
> > > Agreed. I was about to reply with exactly the same point. I haven't done
> > > any UIO coding, but that device file will eventually have to be opened.
> > > Turn on the clocks in the open and turn them off at close.
> 
> > > Rate to request can be a DT property.
> 
> > But you are assuming each device implemented in the fpga uses one clock.
> > This assumption is clearly not valid since devices will ahve to share
> > clocks.
> 
> The binding should obviously be defined as a set of clocks rather than a
> single clock - something like how we specify regulators on PMICs
> probably makes sense.  Each clock can have its own properties.
For a device driver as clock consumer, the bindings etc. are well
defined. Just add the 'clocks' and 'clock-names' props and use the CCF.

	Sören


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