drivers: i2s: add sai support for stm32u5xx

This PR adds initial sai support for STM32u5xx

Signed-off-by: Mario Paja <mario.paja@zal.aero>

Author: mariopaja-zal

drivers/i2s/CMakeLists.txt

@@ -16,3 +16,4 @@ zephyr_library_sources_ifdef(CONFIG_I2S_MCUX_SAI	i2s_mcux_sai.c)
 zephyr_library_sources_ifdef(CONFIG_I2S_ESP32		i2s_esp32.c)
 zephyr_library_sources_ifdef(CONFIG_I2S_SILABS_SIWX91X	i2s_silabs_siwx91x.c)
 zephyr_library_sources_ifdef(CONFIG_I2S_TEST		i2s_test.c)
+zephyr_library_sources_ifdef(CONFIG_I2S_STM32_SAI   i2s_stm32_sai.c)

drivers/i2s/Kconfig.stm32

@@ -25,3 +25,23 @@ config I2S_STM32_TX_BLOCK_COUNT
 	default 4
 
 endif # I2S_STM32
+
+menuconfig I2S_STM32_SAI
+	bool "STM32 MCU I2S controller driver"
+	default y
+	depends on DT_HAS_ST_STM32_SAI_ENABLED
+	select CACHE_MANAGEMENT if CPU_HAS_DCACHE
+	select DMA
+	select USE_STM32_HAL_DMA
+	select USE_STM32_HAL_DMA_EX
+	select USE_STM32_HAL_SAI
+	help
+	  Enable SAI support on the STM32U5 family of processors.
+
+if I2S_STM32_SAI
+
+config I2S_STM32_SAI_BLOCK_COUNT
+	int "SAI queue length"
+	default 4
+
+endif # I2S_STM32_SAI