i.MX Processors中的主题 Re: set CCM_CLKO1 to 11.2896MHzMHz

set CCM_CLKO1 to 11.2896MHzMHz

强王 — Tue, 12 May 2015 07:56:54 GMT

in 3.10.53 kernel:

CCM_CLKO1（audio i2s master）is 24MHZ , how to set to 11.2896MHzMHz

I change

imx_clk_set_rate(clk[pll4_audio_div], 541900800);

imx_clk_set_rate(clk[pll4_audio_div], 90316800); //8*11289600

question:

clk_get_rate(data->codec_clk) print the value is 11289600,

but the clock is still 22.5MHZ(11289600*2) by oscilloscope

Re: set CCM_CLKO1 to 11.2896MHzMHz

saurabh206 — Tue, 12 May 2015 08:29:01 GMT

Qiang

What is your kernel version?

For Linux Kernel 3.0.35

you can refer arch\arm\mach-mx6\clock.c

clk_set_rate().

Thanks

Saurabh

Re: set CCM_CLKO1 to 11.2896MHzMHz

强王 — Tue, 12 May 2015 08:48:02 GMT

in 3.10.53 kernel:

CCM_CLKO1（audio i2s master）is 24MHZ , how to set to 11.2896MHzMHz

I change

imx_clk_set_rate(clk[pll4_audio_div], 541900800);

imx_clk_set_rate(clk[pll4_audio_div], 90316800); //8*11289600

question:

clk_get_rate(data->codec_clk) print the value is 11289600,

but the clock is still 22.5MHZ(11289600*2) by oscilloscope

Re: set CCM_CLKO1 to 11.2896MHzMHz

saurabh206 — Tue, 12 May 2015 08:53:02 GMT

Hi Qiang

Which clock you are measuring MCLK or Bit clock? if it is bit clock (SSI clock) than output clock is divided based on DIV2, PSR and PM parameter configuration.

You can check

Re: set CCM_CLKO1 to 11.2896MHzMHz

强王 — Tue, 12 May 2015 09:14:23 GMT

HI Saurabh:

the board is imx6q sabresd

i measure GPIO_0

Re: set CCM_CLKO1 to 11.2896MHzMHz

强王 — Tue, 12 May 2015 10:03:11 GMT

HI Saurabh:

Could you upload the document of this picture

Re: set CCM_CLKO1 to 11.2896MHzMHz

saurabh206 — Tue, 12 May 2015 10:14:41 GMT

Hi Qiang

Please refer "IMX6DQRM.pdf"

60.7.4 SSI Clocking

Thanks

Saurabh

Re: set CCM_CLKO1 to 11.2896MHzMHz

gusarambula — Wed, 13 May 2015 23:14:14 GMT

Thank you, Saurabh, for the help! I'm sure this information will help other users of the communities.

Re: set CCM_CLKO1 to 11.2896MHzMHz

强王 — Thu, 14 May 2015 02:25:23 GMT

HI Saurabh and gusarambula:

I don't quite understand this picture

Can you tell me the code after the modification