gpio: Add a GPIO config

At present we have SPL_GPIO and TPL_GPIO but not piain GPIO. This
works because there is a special build rule in Makefile that always
includes the drivers/gpio 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.

Enable the option always for now, since this mimics current behaviour.
This can be updated once DM_GPIO is used everywhere.

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

diff --git a/Makefile b/Makefile
index 27fba91..a2f7129 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -813,7 +813,6 @@ libs-y += fs/
 libs-y += net/
 libs-y += disk/
 libs-y += drivers/
-libs-y += drivers/gpio/
 libs-y += drivers/net/
 libs-y += drivers/net/phy/
 libs-y += drivers/power/ \

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ab9adbd..afb4c69 100644 (file)
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -2,7 +2,19 @@
 # GPIO infrastructure and drivers
 #
 
-menu "GPIO Support"
+menuconfig GPIO
+       bool "GPIO support"
+       default y
+       help
+         Enable support for GPIOs (General-purpose Input/Output) in U-Boot.
+         GPIOs allow U-Boot to read the state of an input line (high or
+         low) and set the state of an output line. This can be used to
+         drive LEDs, control power to various system parts and read user
+         input. GPIOs can be useful to enable a 'sign-of-life' LED,
+         for example. Enable this option to build the drivers in
+         drivers/gpio as part of an U-Boot build.
+
+if GPIO
 
 config DM_GPIO
        bool "Enable Driver Model for GPIO drivers"
@@ -503,4 +515,4 @@ config NOMADIK_GPIO
          into a number of banks each with 32 GPIOs. The GPIOs for a device are
          defined in the device tree with one node for each bank.
 
-endmenu
+endif