console: introduce UART console input expired mechanism options.

This CL introduces two configuration options which allows a notification
to the power management module that the UART console module is in use
now. If the interval of console module doesn't receive any input message
exceeds expired timeout, the power management module is allowed to enter
sleep/deep sleep state and turn off the clock of console module.

This mechanism gives a window in which the users can organize input
message if CONFIG_PM is enabled.

Signed-off-by: Mulin Chao <[email protected]>

Author: MulinChao

drivers/console/Kconfig

@@ -81,6 +81,27 @@ config UART_CONSOLE_MCUMGR
 	  process mcumgr frames, but it hands them up to a higher level module
 	  (e.g., the shell).  If unset, incoming mcumgr frames are dropped.
 
+config UART_CONSOLE_INPUT_EXPIRED
+	bool "Enable support for UART console input expired mechanism"
+	default y
+	depends on UART_CONSOLE && PM
+	help
+	  This option allows a notification to the power management module that
+	  the module for UART console is in use now. If the interval of console
+	  module doesn't receive any input message exceeds expired timeout, such
+	  as UART_CONSOLE_INPUT_EXPIRED_TIMEOUT, the power management module is
+	  allowed to enter sleep/deep sleep state and turn off the clock of UART
+	  console module. This mechanism gives a window in which the users can
+	  organize input message if CONFIG_PM is enabled.
+
+config UART_CONSOLE_INPUT_EXPIRED_TIMEOUT
+	int "Fixed amount of time to keep the UART console in use flag true"
+	default 15000
+	depends on UART_CONSOLE_INPUT_EXPIRED
+	help
+	  Fixed amount of time which unit is milliseconds to keep the UART
+	  console in use flag true.
+
 config USB_UART_CONSOLE
 	bool "Use USB port for console outputs"
 	select UART_CONSOLE