drivers: serial: Add UART driver for Renesas RA series

Adding initial support for Renesas RA UART.

To avoid complicating initial code for supporting the SoC,
I have implemented only the bare minimum for now.

Signed-off-by: TOKITA Hiroshi <[email protected]>

Author: soburi

drivers/serial/CMakeLists.txt

@@ -66,6 +66,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_EFINIX_SAPPIHIRE uart_efinix_sapphire.c
 zephyr_library_sources_ifdef(CONFIG_UART_SEDI uart_sedi.c)
 zephyr_library_sources_ifdef(CONFIG_UART_BCM2711_MU uart_bcm2711.c)
 zephyr_library_sources_ifdef(CONFIG_UART_INTEL_LW uart_intel_lw.c)
+zephyr_library_sources_ifdef(CONFIG_UART_RA uart_ra.c)
 
 zephyr_library_sources_ifdef(CONFIG_USERSPACE   uart_handlers.c)
 

drivers/serial/Kconfig

@@ -245,4 +245,6 @@ source "drivers/serial/Kconfig.bcm2711"
 
 source "drivers/serial/Kconfig.intel_lw"
 
+source "drivers/serial/Kconfig.ra"
+
 endif # SERIAL

drivers/serial/Kconfig.ra

@@ -0,0 +1,11 @@
+# Copyright (c) 2023 TOKITA Hiroshi <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+config UART_RA
+	bool "Renesas RA Series UART Driver"
+	default y
+	depends on DT_HAS_RENESAS_RA_UART_SCI_ENABLED
+	select SERIAL_HAS_DRIVER
+	select SERIAL_SUPPORT_INTERRUPT
+	help
+	  Enable Renesas RA series UART driver.