logging: Add uart backend dependency to shell uart backend

nordic-krch · nashif · commit 6d1a31b3fca9 · 2018-11-13T09:17:05.000-05:00
If shell UART backend was enabled and logger uart backend was
not explicitly disabled then both were used resulting in logs
being printed twice on terminal.

Patch modifies default state of log uart backend to depend on
state of shell uart backend.

Signed-off-by: Krzysztof Chruscinski &lt;krzysztof.chruscinski@nordicsemi.no&gt;
diff --git a/samples/subsys/shell/shell_module/prj.conf b/samples/subsys/shell/shell_module/prj.conf
@@ -1,7 +1,6 @@
 CONFIG_PRINTK=y
 CONFIG_SHELL=y
 CONFIG_LOG=y
-CONFIG_LOG_BACKEND_UART=n
 CONFIG_KERNEL_SHELL=y
 CONFIG_THREAD_MONITOR=y
 CONFIG_INIT_STACKS=y
diff --git a/samples/subsys/shell/shell_module/prj_minimal.conf b/samples/subsys/shell/shell_module/prj_minimal.conf
@@ -1,7 +1,6 @@
 CONFIG_PRINTK=y
 CONFIG_SHELL=y
 CONFIG_SERIAL=y
-CONFIG_LOG_BACKEND_UART=n
 CONFIG_KERNEL_SHELL=n
 CONFIG_OBJECT_TRACING=y
 CONFIG_THREAD_MONITOR=y
diff --git a/subsys/logging/Kconfig b/subsys/logging/Kconfig
@@ -290,7 +290,7 @@ config LOG_CMDS
 config LOG_BACKEND_UART
 	bool "Enable UART backend"
 	depends on UART_CONSOLE
-	default y
+	default y if !SHELL_BACKEND_SERIAL
 	help
 	  When enabled backend is using UART to output logs.
 
