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

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Message-ID: <20130513181625.GB14811@sirena.org.uk>
Date:	Mon, 13 May 2013 22:16:25 +0400
From:	Mark Brown <broonie@...nel.org>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Sören Brinkmann <soren.brinkmann@...inx.com>,
	Mike Turquette <mturquette@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RFC] clk: Introduce userspace clock driver

On Mon, May 13, 2013 at 06:21:13PM +0200, Sebastian Hesselbarth wrote:
> On 05/13/13 18:09, Sören Brinkmann wrote:

> >Well, that driver actually exists. But that just programs a bitstream
> >you give it to program. It does not know anything about the design it
> >programs and cannot make any kind of decision whether the clocks should
> >be userspace controlled or not.

> what Mark wants to point out is that you add fabric clocks to the Xilinx
> driver instead. This way, you will have user-space controllable clocks
> but only if you loaded the xilinx driver first.

Yup, that's part of it.  Though I have to say that if all we can do is
stuff a bitstream in there there is the question about how anything that
does require a real driver gets that driver instantiated...

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