serial: Add a SERIAL config

At present we have SPL_SERIAL and TPL_SERIAL but not piain SERIAL. This
works because there is a special build rule in Makefile that always
includes the drivers/serial directory.

It is better to have all driver directories included by drivers/Makefile
and there is already a rule in there for this purpose. It just needs a
Kconfig for U-Boot proper, so add one.

It is always enabled, for now, since that mimics the current behaviour.
It should be possible to drop the strange 'SERIAL_PRESENT' option at some
point and use SERIAL instead.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/Makefile b/Makefile
index 39fd103..132f2f7 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -829,7 +829,6 @@ libs-$(CONFIG_FMAN_ENET) += drivers/net/fm/
 libs-$(CONFIG_SYS_FSL_DDR) += drivers/ddr/fsl/
 libs-$(CONFIG_SYS_FSL_MMDC) += drivers/ddr/fsl/
 libs-$(CONFIG_$(SPL_)ALTERA_SDRAM) += drivers/ddr/altera/
-libs-y += drivers/serial/
 libs-y += drivers/usb/cdns3/
 libs-y += drivers/usb/dwc3/
 libs-y += drivers/usb/common/

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index c972408..36ee432 100644 (file)
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -2,7 +2,18 @@
 # Serial device configuration
 #
 
-menu "Serial drivers"
+menuconfig SERIAL
+       bool "Serial"
+       default y
+       help
+         Enable support for serial drivers. This allows use of a serial UART
+         for displaying messages while U-Boot is running. It also brings in
+         printf() and panic() functions. This should normally be enabled
+         unless there are space reasons not to. If you just need to disable
+         the console you can adjust the stdout environment variable or use
+         SILENT_CONSOLE.
+
+if SERIAL
 
 config BAUDRATE
        int "Default baudrate"
@@ -937,4 +948,4 @@ config SYS_SDMR
        depends on MPC8XX_CONS
        default 0
 
-endmenu
+endif