Device Tree with external oscillator imx6 custom board

jaimepena — Thu, 06 Jul 2017 16:44:17 GMT

Hello,

I have a custom board with imx6dp, I connected an external oscillator of 32MHz to RTC_XTALI pin . I know that when the imx6 detects this signal comming from the XTALI it uses automatically this external clock. I have three questions:

1- how does this affect the device tree configuration?

I found in internet this config of the sabreauto board:

clocks {
	codec_osc: anaclk2 {
	compatible = "fixed-clock";
	#clock-cells = <0>;
	clock-frequency = <24576000>;
	};
	};

but it confuses me beacuse the oscillator for the board is of 28MHz not 24 as can be seen in the layout of the board.

2- When I use the clock from the ESAI interface, is it taking this frequency for the ESAI_TX_HF_CLK??

3- In the imx6qdl-clock.h it gives different clock values, but what does it mean the number , what is the frequency for each one of the definitions?

I have read different documents, please dont refere me to read I will appreciate a clear answer :smileyhappy:

Thanks in advance

Kind regards.

Re: Device Tree with external oscillator imx6 custom board

igorpadykov — Thu, 06 Jul 2017 23:17:07 GMT

Hi jaime

1. 32MHz connected to RTC_XTALI pin does not affect device tree configuration

2. yes, also please refer to sect.Table 25-1. ESAI External Signals i.MX6DQ Reference Manual
http://cache.nxp.com/files/soft_dev_tools/doc/support_info/iMX6DQPRM.pdf

3. clocks names are given in linux/include/dt-bindings/clock/imx6qdl-clock.h
frequencies are dfined in linux/arch/arm/mach-imx/clk-imx6q.c

Best regards
igor

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Device Tree with external oscillator imx6 custom board

Re: Device Tree with external oscillator imx6 custom board