stm32: sai: evolution roadmap

[mariopaja]

Summary

STM32 SAI driver is at the moment implemented specifically and only tested with STM32U5xx series

Describe the solution you'd like

Enhancement:

• add mclk-divider property drivers: i2s: stm32 sai add mclk-divider property #91404
• configure DMA using defines (ongoing...)

• Looking into dmic_stm32_pdm implementation, but no commitment yet

I intend to implement & test

• STM32U3xx dts: st: u3: enable sai node for stm32u3xx #92575
  • Related PR:
    • dts: st: u3: stm32u385rgtxq: add missing sa1_fs_a pins hal_stm32#301
    • stm32: samples: drivers: i2s: output: board: update nucleo_u385rg_q sa1 pins node #94082
• STM32U5xx drivers: i2s: add sai support for stm32u5xx #82945
• STM32G4xx dts: st: g4: add sai node for stm32g4xx #93480
• STM32L4xx
• STM32L5xx
• STM32H5xx drivers: i2s: add sai support for stm32h5xx #91555
• STM32H7xx drivers: i2s: add sai support for stm32h7xx #92887
• STM32H7RS drivers: i2s: add sai support for stm32h7rs #93317
• STM32F2xx
• STM32F4xx
• STM32F7xx
• STM32N6xx (ready, waiting H7 & H7RS to be merged)
• STM32WBA5x

PS: These are the only platforms which I have HW. Since this is a side project might take a while to implement and test all the platforms. Support is always welcomed :)

[mariopaja]

Special thanks to @erwango and ST for their support with WBA5, F7, H7RS & N6 series :D

[evgeniy-paltsev]

@mariopaja I can test (and review) part of the changes related to STM32L4 - so feel free to ping me when it's ready :)