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

@@ -37,6 +37,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_ITE_IT8XXX2 uart_ite_it8xxx2.c)
 zephyr_library_sources_ifdef(CONFIG_UART_LITEX uart_litex.c)
 zephyr_library_sources_ifdef(CONFIG_UART_LPC11U6X uart_lpc11u6x.c)
 zephyr_library_sources_ifdef(CONFIG_UART_MAX32 uart_max32.c)
+zephyr_library_sources_ifdef(CONFIG_UART_MCHP_MEC5 uart_mchp_mec5.c)
 zephyr_library_sources_ifdef(CONFIG_UART_MCUX uart_mcux.c)
 zephyr_library_sources_ifdef(CONFIG_UART_MCUX_FLEXCOMM uart_mcux_flexcomm.c)
 zephyr_library_sources_ifdef(CONFIG_UART_MCUX_IUART uart_mcux_iuart.c)

drivers/serial/Kconfig

@@ -187,6 +187,7 @@ rsource "Kconfig.mcux_flexcomm"
 rsource "Kconfig.mcux_iuart"
 rsource "Kconfig.mcux_lpsci"
 rsource "Kconfig.mcux_lpuart"
+rsource "Kconfig.mec5"
 rsource "Kconfig.miv"
 rsource "Kconfig.msp432p4xx"
 rsource "Kconfig.native_posix"

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