RFC: Zynq Clock Controller

Hi S?ren,

On Tue, 2013-03-05 at 12:04 -0800, S?ren 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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