Messages in this thread | | | Date | Wed, 15 Apr 2015 21:43:30 +0300 | From | Tero Kristo <> | Subject | Re: AM335x OMAP2 common clock external fixed-clock registration |
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On 04/15/2015 05:09 PM, Michael Welling wrote: > On Wed, Apr 15, 2015 at 09:34:48AM +0300, Tero Kristo wrote: >> On 04/15/2015 12:17 AM, Michael Welling wrote: >>> Greetings, >>> >>> I have developed an AM3354 based SoM and it uses an external SI5351 clock >>> generator to drive the clock inputs for an external duart and I2S audio >>> master clock. With the registration according to the documentation the >>> reference clock is not being detected and hence the clock generator is >>> not working as expect. >>> >>> After trying many different things, I started to look around the mailing >>> lists to find information related to this issue. >>> >>> I came acrossed post that has the exact same issue: >>> https://lkml.org/lkml/2013/2/18/468 >>> >>> Seeing as the patch did not land upstream, I am wondering if there is >>> a solution that I am not seeing. >>> >>> I am willing to provide a patch given appropriate guidance. >> >> Hi Michael, >> >> The info on the email you referenced is kind of obsolete, TI SoCs >> are calling of_clk_init() during boot now, and thus external clock >> nodes should be registered fine also. Maybe you can provide the >> actual DTS patch you are trying out so we can help better...? Are > > See attached patch and console output.
I see a bug in your dt data.
<snip>
+ clocks { + ref27: ref27 { + #clock-cells = <0>; + compatibale = "fixed-clock";
This should be compatible, right? DT is annoying in that it doesn't verify property names.
+ clock-frequency = <27000000>; + }; + };
-Tero
> >> you seeing any boot time error / warning prints for your new clock? > > With the debug messages on you see that the reference clock is not being > detected. > > Whilest debugging I found that the of_clk_get is returning an error no matter > which clock I pass it: > http://lxr.free-electrons.com/source/drivers/clk/clk-si5351.c#L1131 > >> >> -Tero
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