drivers: serial: Adding PDL based UART driver

Adding a basic UART driver based on the PDL API

Signed-off-by: Sreeram Tatapudi <[email protected]>

Author: sreeramIfx

boards/infineon/kit_psc3m5_evk/kit_psc3m5_evk-common.dtsi

@@ -64,6 +64,10 @@
 	status = "okay";
 };
 
+&gpio_prt6 {
+	status = "okay";
+};
+
 &gpio_prt8 {
 	status = "okay";
 };

boards/infineon/kit_psc3m5_evk/kit_psc3m5_evk-pinctrl.dtsi

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 Cypress Semiconductor Corporation.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* Configure pin drive mode for uart pins */
+&p6_3_scb3_uart_tx {
+	drive-push-pull;
+};
+
+&p6_2_scb3_uart_rx {
+	input-enable;
+};
+
+&p6_1_scb3_uart_rts {
+	drive-push-pull;
+};
+
+&p6_0_scb3_uart_cts {
+	input-enable;
+};

boards/infineon/kit_psc3m5_evk/kit_psc3m5_evk.dts

@@ -8,6 +8,7 @@
 #include <arm/infineon/cat1b/psc3/system_clocks.dtsi>
 #include <arm/infineon/cat1b/psc3/psc3_partition.dtsi>
 #include "kit_psc3m5_evk-common.dtsi"
+#include "kit_psc3m5_evk-pinctrl.dtsi"
 
 / {
 	model = "The Infineon PSOC™ Control C3M5 Evaluation Kit";
@@ -20,13 +21,13 @@
 	chosen {
 		zephyr,sram = &sram0;
 		zephyr,flash = &slot0_partition;
-		zephyr,console = &uart1;
-		zephyr,shell-uart = &uart1;
+		zephyr,console = &uart3;
+		zephyr,shell-uart = &uart3;
 	};
 };
 
-uart1: &scb3 {
-	compatible = "infineon,cat1-uart";
+uart3: &scb3 {
+	compatible = "infineon,cat1-uart-pdl";
 	status = "okay";
 	current-speed = <115200>;
 
@@ -36,12 +37,18 @@ uart1: &scb3 {
 	pinctrl-names = "default";
 };
 
+&peri0_group4_8bit_0 {
+	status = "okay";
+	scb-block = <3>;
+	div-value = <109>;
+};
+
 &path_mux0 {
 	status = "okay";
 };
 
 &path_mux1 {
-	status = "disabled";
+	status = "okay";
 };
 
 &path_mux2 {
@@ -57,12 +64,11 @@ uart1: &scb3 {
 };
 
 &clk_hf1 {
-	status = "disabled";
+	status = "okay";
 };
 
 &clk_hf2 {
 	status = "okay";
-	clocks = <&fll0>;
 };
 
 &clk_hf3 {

boards/infineon/kit_psc3m5_evk/kit_psc3m5_evk_defconfig

@@ -13,3 +13,10 @@ CONFIG_GPIO=y
 
 # Enable clock controller
 CONFIG_CLOCK_CONTROL=y
+
+# Enable console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+# Enable UART driver
+CONFIG_SERIAL=y

boards/infineon/kit_psc3m5_evk/kit_psc3m5_evk_psc3m5fds2afq1_ns_defconfig

@@ -14,3 +14,10 @@ CONFIG_GPIO=y
 
 # Enable clock controller
 CONFIG_CLOCK_CONTROL=y
+
+# Enable console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+# Enable UART driver
+CONFIG_SERIAL=y

drivers/serial/CMakeLists.txt

@@ -63,6 +63,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_NUMAKER uart_numaker.c)
 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_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.ifx_cat1

@@ -16,3 +16,14 @@ config UART_INFINEON_CAT1
 	select DMA if UART_ASYNC_API
 	help
 	  This option enables the UART driver for Infineon CAT1 family.
+
+config UART_PDL_INFINEON_CAT1
+	bool "Infineon CAT1 UART driver (PDL)"
+	default y
+	depends on DT_HAS_INFINEON_CAT1_UART_PDL_ENABLED
+	select SERIAL_HAS_DRIVER
+	select SERIAL_SUPPORT_INTERRUPT
+	select USE_INFINEON_UART
+	select PINCTRL
+	help
+	  This option enables the UART driver for Infineon CAT1 family.