drivers: spi: siwx91x: Add siwx91x SPI primary driver

Implement SPI driver for siwx91x device

Signed-off-by: Sai Santhosh Malae <[email protected]>

Author: smalae

boards/silabs/radio_boards/siwx917_rb4338a/siwx917_rb4338a.yaml

@@ -16,5 +16,6 @@ supported:
   - i2c
   - pwm
   - watchdog
+  - spi
   - wifi
 vendor: silabs

drivers/spi/CMakeLists.txt

@@ -56,6 +56,7 @@ zephyr_library_sources_ifdef(CONFIG_SPI_SAM0 spi_sam0.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_SEDI spi_sedi.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_SIFIVE spi_sifive.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_SILABS_EUSART spi_silabs_eusart.c)
+zephyr_library_sources_ifdef(CONFIG_SPI_SILABS_SIWX91X_GSPI spi_silabs_siwx91x_gspi.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_SILABS_USART spi_silabs_usart.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_SMARTBOND spi_smartbond.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_STM32 spi_ll_stm32.c)

drivers/spi/Kconfig

@@ -133,6 +133,7 @@ source "drivers/spi/Kconfig.sam0"
 source "drivers/spi/Kconfig.sedi"
 source "drivers/spi/Kconfig.sifive"
 source "drivers/spi/Kconfig.silabs_eusart"
+source "drivers/spi/Kconfig.silabs_siwx91x_gspi"
 source "drivers/spi/Kconfig.silabs_usart"
 source "drivers/spi/Kconfig.smartbond"
 source "drivers/spi/Kconfig.spi_emul"

drivers/spi/Kconfig.silabs_siwx91x_gspi

@@ -0,0 +1,28 @@
+# Copyright (c) 2025 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config SPI_SILABS_SIWX91X_GSPI
+	bool "Silabs GSPI SPI Primary controller driver"
+	default y
+	depends on DT_HAS_SILABS_GSPI_ENABLED
+	select GPIO
+	select PINCTRL
+	help
+	  Enable the GSPI SPI primary driver for the Silabs SiWx91x SoC series.
+
+if SPI_SILABS_SIWX91X_GSPI
+
+config SPI_SILABS_SIWX91X_GSPI_DMA
+	bool "DMA Support"
+	select DMA
+	help
+	  Enable DMA support for SIWX91X MCU GSPI driver.
+
+config SPI_SILABS_SIWX91X_GSPI_DMA_MAX_BLOCKS
+	int "Maximum DMA transfer block per channel for a transaction."
+	depends on SPI_SILABS_SIWX91X_GSPI_DMA
+	default 16
+	help
+	  One block is needed for every chunk found in the SPI transaction and every 1024 bytes
+
+endif # SPI_SILABS_SIWX91X_GSPI