logger: Simplify UART backend initialization

Move definition to sources of UART backend.

Signed-off-by: Andrei Emeltchenko <[email protected]>

Author: finikorg

include/logging/log_backend_uart.h

@@ -3,7 +3,8 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
-#include <logging/log_backend_uart.h>
+
+#include <logging/log_backend.h>
 #include <logging/log_core.h>
 #include <logging/log_msg.h>
 #include <logging/log_output.h>
@@ -66,3 +67,5 @@ const struct log_backend_api log_backend_uart_api = {
 	.panic = panic,
 	.init = log_backend_uart_init,
 };
+
+LOG_BACKEND_DEFINE(log_backend_uart, log_backend_uart_api);

subsys/logging/log_backend_uart.c

@@ -9,7 +9,6 @@
 #include <logging/log_backend.h>
 #include <logging/log_ctrl.h>
 #include <logging/log_output.h>
-#include <logging/log_backend_uart.h>
 #include <misc/printk.h>
 #include <assert.h>
 #include <atomic.h>
@@ -18,13 +17,6 @@
 #define CONFIG_LOG_PRINTK_MAX_STRING_LENGTH 1
 #endif
 
-#ifdef CONFIG_LOG_BACKEND_UART
-LOG_BACKEND_UART_DEFINE(log_backend_uart);
-const struct log_backend *uart_backend = &log_backend_uart;
-#else
-const struct log_backend *uart_backend;
-#endif
-
 static struct log_list_t list;
 static atomic_t initialized;
 static bool panic_mode;