drivers: serial: mec5: Microchip MEC5 UART serial driver

We add a serial UART driver for Microchip MEC5 HAL based chips.
The driver supports polling, interrupts, and runtime configuration
features. Power management will be implemented in a future PR.

Signed-off-by: Scott Worley <[email protected]>

drivers/serial/CMakeLists.txt

@@ -80,6 +80,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_SI32_USART uart_si32_usart.c)
 zephyr_library_sources_ifdef(CONFIG_USERSPACE   uart_handlers.c)
 zephyr_library_sources_ifdef(CONFIG_UART_SCI_RA uart_renesas_ra_sci.c)
 zephyr_library_sources_ifdef(CONFIG_UART_SY1XX uart_sy1xx.c)
+zephyr_library_sources_ifdef(CONFIG_UART_MCHP_MEC5 uart_mchp_mec5.c)
 
 if(CONFIG_UART_NATIVE_POSIX)
   zephyr_library_compile_definitions(NO_POSIX_CHEATS)

drivers/serial/Kconfig

@@ -284,4 +284,6 @@ rsource "Kconfig.sy1xx"
 
 source "drivers/serial/Kconfig.si32"
 
+source "drivers/serial/Kconfig.mec5"
+
 endif # SERIAL

drivers/serial/Kconfig.mec5

@@ -0,0 +1,27 @@
+# Microchip MEC5 UART
+
+# Copyright (c) 2024 Microchip Technology Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config UART_MCHP_MEC5
+	bool "Microchip MEC5 family ns16550 compatible UART driver"
+	default y
+	depends on DT_HAS_MICROCHIP_MEC5_UART_ENABLED
+	select SERIAL_HAS_DRIVER
+	select SERIAL_SUPPORT_INTERRUPT
+	help
+	  This option enables the UART driver for Microchip MEC5
+	  family processors.
+
+if UART_MCHP_MEC5
+
+config UART_MCHP_MEC5_LINE_CTRL
+	bool "Serial Line Control for Apps"
+	depends on UART_LINE_CTRL
+	help
+	  This enables the API for apps to control the serial line,
+	  such as CTS and RTS.
+
+	  Says n if not sure.
+
+endif # UART_MCHP_MEC5