linux-kernel - Re: RFC: Zynq Clock Controller

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Date:	Wed, 06 Mar 2013 12:51:21 +0100
From:	Jan Lübbe <jlu@...gutronix.de>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>,
	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Josh Cartwright <josh.cartwright@...com>,
	Michal Simek <michal.simek@...inx.com>,
	Peter Crosthwaite <pcrost@...inx.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, git@...inx.com
Subject: Re: RFC: Zynq Clock Controller

Hi Sören,

On Tue, 2013-03-05 at 12:04 -0800, Sören Brinkmann wrote:
> For this reasons, I'd like to propose moving Zynq into the same
> direction. I.e. adding a clock controller with the following DT
> description (details may change but the general idea should become
> clear):
> 	clkc: clkc {
>                 #clock-cells = <1>;
>                 compatible = "xlnx,ps7-clkc";
>                 ps_clk_frequency = <33333333>;	# board x-tal
>                 # optional props
>                 gem0_emio_clk_freq = <125000000>;
>                 gem1_emio_clk_freq = <50000000>;
>                 can_mio_clk_freq_xx = <1234>; # this is possible 54 times with xx = 00..53
>         };

The clock controller should only contain properties for input frequency
(which can obviously not be calculated at run-time).

Are the gem*, can* properties inputs? If they are actually outputs, the
corresponding frequencies should be requested by the clock consumers and
not hard-coded in DT.

Please keep in mind that DT properties use dashes instead of
underscores.

Best regards,
Jan
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