driver: serial: Add Infineon CAT2 UART driver

Add initial implementation of the Infineon CAT2 UART driver based on the
Peripheral Driver Library (PDL) for CAT2 (PSoC 4100TP) devices.

- Supports UART transmit and receive using PDL SCB UART APIs
- Configurable baud rate, parity, stop bits, and data bits from devicetree
- Uses pinctrl to configure TX/RX pins
- Supports Zephyr console and shell subsystems
- Provides build-time validation for UART configuration parameters
- Default UART configuration defined in `uart_ifx_cat2_pdl.c`

Signed-off-by: Dharun krithik k <[email protected]>
Signed-off-by: Sayooj K Karun <[email protected]>

Author: dharunkrithikk

boards/infineon/cy8cproto_041tp/cy8cproto_041tp.dts

@@ -8,6 +8,7 @@
 /dts-v1/;
 #include <arm/infineon/cat2/mpns/cy8c4147azq_t495.dtsi>
 #include <arm/infineon/cat2/psoc4100tp/system_clocks.dtsi>
+#include "cy8cproto_041tp-pinctrl.dtsi"
 
 / {
 	model = "CY8CPROTO-041TP Development Board";
@@ -16,9 +17,20 @@
 	chosen {
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
+		zephyr,console = &uart0;
+		zephyr,shell-uart = &uart0;
 	};
 };
 
+uart0: &scb0 {
+	compatible = "infineon,cat2-uart";
+	status = "okay";
+	current-speed = <115200>;
+	clocks = <&peri0_group0_16bit_0>;
+	pinctrl-0 = <&p5_2_scb0_uart_tx &p5_1_scb0_uart_rx>;
+	pinctrl-names = "default";
+};
+
 &peri0_group0_16bit_0 {
 	status = "okay";
 	resource-type = <IFX_RSC_SCB>;

drivers/i2c/i2c_ifx_cat1_pdl.c

@@ -1,5 +1,5 @@
 /*
- * (c) 2025 Infineon Technologies AG, or an affiliate of Infineon Technologies AG.
+ * Copyright (c) 2025 Infineon Technologies AG, or an affiliate of Infineon Technologies AG.
  * All rights reserved.
  *
  * SPDX-License-Identifier: Apache-2.0

drivers/serial/CMakeLists.txt

@@ -67,6 +67,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_NUMICRO uart_numicro.c)
 zephyr_library_sources_ifdef(CONFIG_UART_NXP_S32_LINFLEXD uart_nxp_s32_linflexd.c)
 zephyr_library_sources_ifdef(CONFIG_UART_OPENTITAN uart_opentitan.c)
 zephyr_library_sources_ifdef(CONFIG_UART_PDL_INFINEON_CAT1 uart_ifx_cat1_pdl.c)
+zephyr_library_sources_ifdef(CONFIG_UART_PDL_INFINEON_CAT2 uart_ifx_cat2_pdl.c)
 zephyr_library_sources_ifdef(CONFIG_UART_PIPE uart_pipe.c)
 zephyr_library_sources_ifdef(CONFIG_UART_PL011 uart_pl011.c)
 zephyr_library_sources_ifdef(CONFIG_UART_PSOC6 uart_psoc6.c)

drivers/serial/Kconfig

@@ -181,6 +181,7 @@ rsource "Kconfig.gd32"
 rsource "Kconfig.gecko"
 rsource "Kconfig.hostlink"
 rsource "Kconfig.ifx_cat1"
+rsource "Kconfig.ifx_cat2"
 rsource "Kconfig.imx"
 rsource "Kconfig.intel_lw"
 rsource "Kconfig.it51xxx"

drivers/serial/Kconfig.ifx_cat2

@@ -0,0 +1,15 @@
+# Copyright (c) 2025 Infineon Technologies AG,
+# or an affiliate of Infineon Technologies AG.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+config UART_PDL_INFINEON_CAT2
+	bool "Infineon CAT2 UART driver (PDL)"
+	default y
+	depends on DT_HAS_INFINEON_CAT2_UART_ENABLED
+	select SERIAL_HAS_DRIVER
+	select SERIAL_SUPPORT_INTERRUPT
+	select USE_INFINEON_UART
+	select PINCTRL
+	help
+	This option enables the UART driver for Infineon CAT2 PDL family.