On Thu, Oct 8, 2015 at 10:41 PM, <sunxy.ene...@gmail.com> wrote:
> Good morning all
>
> I am trying to output allwinner A20 clk_out_a to the relevant PI12 of the
> cpu
> That should be possible in theory and olimex board actually has a pin where
> I can test it.
>
> My current setup is uBoot bootloader that can successfully boot Linux
> version 4.3.0-rc1-96427-g904c778-dirty
> I am using the sun7i-a20-olinuxino-micro.dts where I have removed the uart6
> (that should be conflicting with clk_out_a) and I have added
>
> &clk_out_a {
> pinctrl-names = "default";
> pinctrl-0 = <&clk_out_a_pins_a>;
> status = "okay";
> };
>
> in the dts file, compiled and installed
>
> Now, there is nothing whatsoever in the relevant pin and the question is
>
> What am I missing ?
>
> Thanks for any hints you may give me
>
> P.S. Yes, I have read quite a lot documentation on dts, but evidently not
> enough to find the solution myself.
The clock on that pin is by default off. You still need a driver to acquire
and enable it.
ChenYu
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