Hello @Kimmo Raatikainen ,
If i'm right, you followed this page: https://wiki.st.com/stm32mpu/wiki/I2S_Linux_driver#Kernel_Configuration
To enable the I2S interface support as a built-in and not a module, you have to push one more time the "space" key. If you never used menuconfig, I would recommend you to also read this page:
https://wiki.st.com/stm32mpu/wiki/Menuconfig_or_how_to_configure_kernel#Menuconfig_and_Developer_Package
useful keys to know:
enter: enter in config subdirectory
space: hit several times to either select [*], select in module [m] or unselect [ ]
/: to search for a keyword, this is usefull to navigate in tree
?: to have more information on selected line
If you have a "*" instead of a "m", it means that you correctly enabled it as a "built-in".
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Regarding the Device Tree (DTS) question, I would advise you to understand to read this page:
https://wiki.st.com/stm32mpu/wiki/STM32_MPU_device_tree
If you are building a developer package, you can find the linux device tree in "arch/arm/boot/dts".
If you are using the distribution package , you have to follow the last paragraph of the page that I sent above.
Hope it helps,
Best Regards,
Kevin
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