added poll api passthrough

.gitignore

@@ -0,0 +1 @@
+build/

CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.20.0)
+
+list(APPEND ZEPHYR_EXTRA_MODULES ${CMAKE_CURRENT_SOURCE_DIR}/modules/uart-interrupt-poll-bridge)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(zephyr-uart-polling-interrupt-bridge C CXX)
+
+set(CMAKE_BUILD_TYPE Debug)
+target_compile_options(app PRIVATE -O0 -g)
+
+target_sources(app PRIVATE
+    src/main.cpp
+)

boards/xiao_nrf54l15_nrf54l15_cpuapp.conf

@@ -0,0 +1,3 @@
+CONFIG_SERIAL=y
+
+CONFIG_UART_INTERRUPT_POLL_BRIDGE=y

boards/xiao_nrf54l15_nrf54l15_cpuapp.overlay

@@ -0,0 +1,18 @@
+/ {
+    aliases {
+        testuart = &test_uart;
+    };
+
+    test_uart: test_uart {
+        compatible = "uart-interrupt-poll-bridge";
+        uart = <&uart20>;
+        timer = <&timer00>;
+        interrupts = <1 2>; 
+        interrupt-parent = <&nvic>;
+        status = "okay";
+    };
+};
+
+&timer00 {
+    status = "okay";
+};

modules/uart-interrupt-poll-bridge/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(drivers/serial/uart-interrupt-poll-bridge)

modules/uart-interrupt-poll-bridge/Kconfig

@@ -0,0 +1 @@
+rsource "drivers/serial/uart-interrupt-poll-bridge/Kconfig"

modules/uart-interrupt-poll-bridge/drivers/serial/uart-interrupt-poll-bridge/CMakeLists.txt

@@ -0,0 +1 @@
+zephyr_library_sources_ifdef(CONFIG_UART_INTERRUPT_POLL_BRIDGE uart-interrupt-poll-bridge.c)

modules/uart-interrupt-poll-bridge/drivers/serial/uart-interrupt-poll-bridge/Kconfig

@@ -0,0 +1,7 @@
+config UART_INTERRUPT_POLL_BRIDGE
+    bool "UART interrupt/poll bridge driver"
+    default y
+
+config UART_INTERRUPT_POLL_BRIDGE_QUEUE_SIZE
+    int "UART interrupt/poll bridge driver rx / tx buffer size"
+    default 256

modules/uart-interrupt-poll-bridge/drivers/serial/uart-interrupt-poll-bridge/uart-interrupt-poll-bridge.c

@@ -0,0 +1,125 @@
+#define DT_DRV_COMPAT uart_interrupt_poll_bridge
+
+#include <zephyr/drivers/uart.h>
+#ifdef CONFIG_UART_INTERRUPT_DRIVEN
+#include <zephyr/sys/ring_buffer.h>
+#endif
+
+struct uart_pti_bridge_config {
+	const struct device *uart;
+#ifdef CONFIG_UART_INTERRUPT_DRIVEN
+	const struct device *timer;
+	const uint8_t interrupt_line;
+#endif
+};
+
+struct uart_pti_bridge_data {
+#ifdef CONFIG_UART_INTERRUPT_DRIVEN
+	struct ring_buf *rx_buf;
+	struct ring_buf *tx_buf;
+#endif
+};
+
+int uart_pti_bridge_init(const struct device *dev) {
+	ARG_UNUSED(dev);
+	return 0;
+}
+
+
+static int uart_pti_bridge_poll_in(const struct device *dev, unsigned char *c) {
+	const struct uart_pti_bridge_config *config = dev->config;
+
+	return uart_poll_in(config->uart, c);
+}
+
+
+static void uart_pti_bridge_poll_out(const struct device *dev,
+					   unsigned char c) {
+	const struct uart_pti_bridge_config *config = dev->config;
+
+	return uart_poll_out(config->uart, c);
+}
+
+
+static int uart_pti_bridge_err_check(const struct device *dev) {
+	const struct uart_pti_bridge_config *config = dev->config;
+
+	return uart_err_check(config->uart);
+}
+
+
+#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
+static int uart_pti_bridge_configure(const struct device *dev,
+				  const struct uart_config *cfg) {
+	ARG_UNUSED(dev);
+	ARG_UNUSED(cfg);
+	return 0;
+}
+
+static int uart_pti_bridge_config_get(const struct device *dev,
+				   struct uart_config *cfg) {
+	const struct uart_pti_bridge_config *config = dev->config;
+
+	return uart_config_get(config->uart, cfg);
+}
+#endif
+
+static DEVICE_API(uart, uart_interrupt_poll_bridge_api) = {
+	.poll_in = uart_pti_bridge_poll_in,
+	.poll_out = uart_pti_bridge_poll_out,
+	.err_check = uart_pti_bridge_err_check,
+#ifdef CONFIG_UART_USE_RUNTIME_CONFIGURE
+	.configure = uart_pti_bridge_configure,
+	.config_get = uart_pti_bridge_config_get,
+#endif
+#ifdef CONFIG_UART_INTERRUPT_DRIVEN
+	.fifo_fill = NULL,
+	.fifo_read = NULL,
+	.irq_tx_enable = NULL,
+	.irq_tx_disable = NULL,
+	.irq_tx_ready = NULL,
+	.irq_tx_complete = NULL,
+	.irq_rx_enable = NULL,
+	.irq_rx_disable = NULL,
+	.irq_rx_ready = NULL,
+	.irq_err_enable = NULL,
+	.irq_err_disable = NULL,
+	.irq_is_pending = NULL,
+	.irq_update = NULL,
+	.irq_callback_set = NULL,
+#endif
+};
+
+
+#define BRIDGE_DEFINE(inst)																				\
+	COND_CODE_1(CONFIG_UART_INTERRUPT_DRIVEN, (															\
+		RING_BUF_DECLARE(uart_pti_bridge_rx_buf##inst, CONFIG_UART_INTERRUPT_POLL_BRIDGE_QUEUE_SIZE);	\
+		RING_BUF_DECLARE(uart_pti_bridge_tx_buf##inst, CONFIG_UART_INTERRUPT_POLL_BRIDGE_QUEUE_SIZE);	\
+	), ())																								\
+																										\
+    static struct uart_pti_bridge_data uart_pti_bridge_data_##inst = {									\
+		COND_CODE_1(CONFIG_UART_INTERRUPT_DRIVEN, (														\
+            .rx_buf = &uart_pti_bridge_rx_buf##inst,													\
+            .tx_buf = &uart_pti_bridge_tx_buf##inst,													\
+        ), ())																							\
+	};																									\
+																										\
+    static const struct uart_pti_bridge_config uart_pti_bridge_config_##inst = {						\
+        .uart = DEVICE_DT_GET(DT_INST_PHANDLE(inst, uart)),												\
+        COND_CODE_1(CONFIG_UART_INTERRUPT_DRIVEN, (														\
+            .timer = DEVICE_DT_GET(DT_INST_PHANDLE(inst, timer)),										\
+            .interrupt_line = DT_INST_IRQN(inst),														\
+        ), ())																							\
+    };																									\
+																										\
+    DEVICE_DT_INST_DEFINE(inst,																			\
+        uart_pti_bridge_init,																			\
+        NULL,																							\
+        &uart_pti_bridge_data_##inst,                                               					\
+        &uart_pti_bridge_config_##inst,																	\
+        POST_KERNEL,																					\
+        CONFIG_KERNEL_INIT_PRIORITY_DEVICE,																\
+        &uart_interrupt_poll_bridge_api);
+
+
+DT_INST_FOREACH_STATUS_OKAY(BRIDGE_DEFINE)

modules/uart-interrupt-poll-bridge/dts/bindings/interrupt-poll-bridge.yaml

@@ -0,0 +1,17 @@
+description: Uart interrupt driven api for poll only devices via timer instead of busy cpu time
+
+compatible: "uart-interrupt-poll-bridge"
+
+properties:
+  interrupt-parent:
+    type: phandle
+    required: true
+  interrupts:
+    type: array
+    required: true
+  timer:
+    type: phandle
+    required: true
+  uart:
+    type: phandle
+    required: true

modules/uart-interrupt-poll-bridge/zephyr/module.yml

@@ -0,0 +1,8 @@
+name: uart-interrupt-poll-bridge
+
+build:
+  cmake: .
+  kconfig: Kconfig
+
+  settings:
+    dts_root: . 

prj.conf

@@ -0,0 +1,2 @@
+CONFIG_UART_INTERRUPT_DRIVEN=y
+CONFIG_COUNTER=y

src/main.cpp

@@ -0,0 +1,21 @@
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/uart.h>
+
+const struct device *test_uart = DEVICE_DT_GET(DT_ALIAS(testuart));
+
+
+
+int main(void) {
+    
+    const char msg [] = "Hello World";
+
+    while (1) {
+        for (char c : msg) {
+            uart_poll_out(test_uart, c);
+        }
+
+        k_sleep(K_MSEC(100));
+    }
+    return 0;
+}