[PATCH 05/23] serial: Add a SERIAL config

[Simon Glass]

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 at chromium.org>
---

 Makefile               |  1 -
 drivers/serial/Kconfig | 15 +++++++++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 269e353a28a..653df0d2731 100644
--- 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 93348c0929c..205c9ddc442 100644
--- 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"
@@ -939,4 +950,4 @@ config SYS_SDMR
 	depends on MPC8XX_CONS
 	default 0
 
-endmenu
+endif
-- 
2.32.0.605.g8dce9f2422-goog