drivers: spi: add it51xxx spi driver

This commit adds it51xxx spi driver.

Tested with: samples/drivers/spi_flash

Signed-off-by: Ren Chen <Ren.Chen@ite.com.tw>

Author: Chenhongren

drivers/spi/CMakeLists.txt

@@ -27,6 +27,7 @@ zephyr_library_sources_ifdef(CONFIG_SPI_EMUL spi_emul.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_GD32 spi_gd32.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_GRLIB_SPIMCTRL spi_grlib_spimctrl.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_INFINEON_CAT1 spi_ifx_cat1.c)
+zephyr_library_sources_ifdef(CONFIG_SPI_ITE_IT51XXX spi_it51xxx.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_ITE_IT8XXX2 spi_it8xxx2.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_LITEX spi_litex.c)
 zephyr_library_sources_ifdef(CONFIG_SPI_LITEX_LITESPI spi_litex_litespi.c)

drivers/spi/Kconfig

@@ -107,6 +107,7 @@ source "drivers/spi/Kconfig.esp32"
 source "drivers/spi/Kconfig.gd32"
 source "drivers/spi/Kconfig.grlib_spimctrl"
 source "drivers/spi/Kconfig.ifx_cat1"
+source "drivers/spi/Kconfig.it51xxx"
 source "drivers/spi/Kconfig.it8xxx2"
 source "drivers/spi/Kconfig.litex"
 source "drivers/spi/Kconfig.max32"

drivers/spi/Kconfig.it51xxx

@@ -0,0 +1,10 @@
+# Copyright (c) 2025 ITE Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+config SPI_ITE_IT51XXX
+	bool "ITE IT51XXX SPI Driver"
+	default y
+	depends on DT_HAS_ITE_IT51XXX_SPI_ENABLED
+	select PINCTRL
+	help
+	  Enable support for the ITE IT51XXX SPI host (SSPI) driver.