i.MX ProcessorsのトピックRe: How to assign specific clock frequency to PLL4 in device tree ?

How to assign specific clock frequency to PLL4 in device tree ?

alexandrspivac — Wed, 15 Mar 2017 10:50:59 GMT

I try to add additional codec to imx 6 SOC in kernel 4.1 :

1. Codec connected to to SSI3 - mux-int-port = <7>; mux-ext-port = <4>;

2. Codec don't receive master clock and must work in master mode - master clock generated internal from bit clock received from ssi;

For now codec works but play very slowly in 48k rate and measured clocks on codec pins about 600 Mhz for bit clok and 20k for word clock.

How to set fixed clock to pll4 and how to append this clock to SSI3 ?

And which clock indemnification i must to bind to codec in device tree?

All Regards.

Re: How to assign specific clock frequency to PLL4 in device tree ?

igorpadykov — Wed, 15 Mar 2017 23:38:25 GMT

Hi Alexandr

one can check available clocks in linux/include/dt-bindings/clock/imx6qdl-clock.h
Please refer to description of Linux common clock framework in :
linux/Documentation/devicetree/bindings/clock/clock-bindings.txt
http://elinux.org/images/b/b8/Elc2013_Clement.pdf

Best regards
igor
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