drivers: i2s: siwx91x: Add siwx91x I2S primary driver

Implement I2S driver for siwx91x device

Signed-off-by: Sai Santhosh Malae <Santhosh.Malae@silabs.com>

Author: smalae

boards/silabs/radio_boards/siwx917_rb4338a/siwx917_rb4338a.yaml

@@ -18,6 +18,7 @@ supported:
   - watchdog
   - spi
   - uart
+  - i2s
   - wifi
   - rtc
 vendor: silabs

drivers/i2s/CMakeLists.txt

@@ -13,4 +13,5 @@ zephyr_library_sources_ifdef(CONFIG_I2S_MCUX_FLEXCOMM	i2s_mcux_flexcomm.c)
 zephyr_library_sources_ifdef(CONFIG_I2S_NRFX		i2s_nrfx.c)
 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)

drivers/i2s/Kconfig.siwx91x

@@ -0,0 +1,31 @@
+# Copyright (c) 2025 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+menuconfig I2S_SILABS_SIWX91X
+	bool "Silabs Siwx91x MCU I2S controller driver"
+	default y
+	depends on DT_HAS_SILABS_SIWX91X_I2S_ENABLED
+	select CACHE_MANAGEMENT if CPU_HAS_DCACHE
+	select DMA
+	select PINCTRL
+	select GPIO
+	help
+	  Enable I2S support on the Siwx91x family.
+
+if I2S_SILABS_SIWX91X
+
+config I2S_SILABS_SIWX91X_RX_BLOCK_COUNT
+	int "RX queue length"
+	default 4
+
+config I2S_SILABS_SIWX91X_TX_BLOCK_COUNT
+	int "TX queue length"
+	default 4
+
+config I2S_SILABS_SIWX91X_DMA_MAX_BLOCKS
+	int "Maximum DMA transfer block per channel for a transaction."
+	default 16
+	help
+	  One block is needed for every 1024 bytes
+
+endif # I2S_SILABS_SIWX91X