Using I2S on stm32mp135f-dk

[KRaat.1]

Hi I am trying to configure I2S with stm32mp135f-dk so that i2s signals are accessible from 40 pin header. I am using the realtime package (build-openstlinuxweston-stm32mp13-rt). I was checking the instruction from you web and it tells that I should enable I2S using menuconfig. I am seeing that I2S is a module that I cannot directly enable. How can I check that this is in the build?

Also I would need some support regarding the device tree configuration. Do I need to run STM32CubeMX and generate new devicetree files to get something activated? Or is there some existing dts file which I could edit and add my i2s driver in use there? It looks like that stm32mp135f-dk.dts does not currently contain any i2s related configuration.

[Kevin HUBER]

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".

---

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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[KRaat.1]

Hi Kevin,

thank you for your answer. Yes I was following that #kernel_configuration page, posting link to ticket was not possible for new users but you had it figured out. I have been able to use menuconfig, there option cannot be changed to * but only blank or M are valid options. As a result the option is generated as CONF_SND_SOC_STM32_I2S=m.

I am using distribution package for build. Are you suggesting that I need to generate the dts files to get I2S activated?

Br,

Kimmo