For the M8 Mini: Is it possible to generate an MCLK of 12.288MHz internally for use both in the an SAI module and externally for an audio codec, or do I need to generate this frequency externally?

[ykagan]

12.288MHz is a common frequency used an the master clock for 48KHz audio streams. It can be generated from 24MHz by a full-blown PLL by placing 125 in the divisor and 64 in the multiplier. It is not clear to me whether this can be done in the M8 Mini.

[igorpadykov]

Hi Yishai

seems this could be possible, as example one can look at wm8254 in EVK

 Design Tool (1)
    i.MX 8M Mini Evaluation Kit Design Files

i.MX 8M Mini Evaluation Kit | NXP 

linux/arch/arm64/boot/dts/freescale/fsl-imx8mm-evk.dts

&sai3 {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_sai3>;
    assigned-clocks = <&clk IMX8MM_CLK_SAI3_SRC>,
            <&clk IMX8MM_CLK_SAI3_DIV>;
    assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
    assigned-clock-rates = <0>, <24576000>;
    status = "okay";

clock driver :

clk-imx8mm.c\imx\clk\drivers - linux-imx - i.MX Linux kernel 

Description of linux audio subsystem can be found in Chapter 7 Audio

attached Linux Manual.

Best regards
igor
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