[PATCH] watchdog: introduce separate SPL symbol for WDT_GPIO

[Rasmus Villemoes]

Currently, enabling WDT_GPIO on a board which uses SPL, but does not
have SPL_WDT, SPL_DM_GPIO or SPL_OF_CONTROL enabled, breaks the build.

Make it possible to use the WDT_GPIO driver on such boards by
introducing a separate symbol controlling whether the driver is built
for SPL. Make it default to WDT_GPIO such that boards that already
have it enabled and all the SPL prerequisites satisfied will continue
to have it in SPL.

Signed-off-by: Rasmus Villemoes <ravi at prevas.dk>
---
 drivers/watchdog/Kconfig  | 9 +++++++++
 drivers/watchdog/Makefile | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 0c3e9913318..18028269b9e 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -178,6 +178,15 @@ config WDT_GPIO
 	  doc/device-tree-bindings/watchdog/gpio-wdt.txt for
 	  information on how to describe the watchdog in device tree.
 
+config SPL_WDT_GPIO
+	bool "External gpio watchdog support in SPL"
+	depends on SPL_WDT
+	depends on SPL_DM_GPIO
+	depends on SPL_OF_REAL
+	default WDT_GPIO
+	help
+	  Support for external watchdog fed by toggling a gpio in SPL.
+
 config WDT_MAX6370
 	bool "MAX6370 watchdog timer support"
 	depends on WDT
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 7b39adcf0ff..a450c33b3ad 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -30,7 +30,7 @@ obj-$(CONFIG_WDT_CORTINA) += cortina_wdt.o
 obj-$(CONFIG_WDT_ORION) += orion_wdt.o
 obj-$(CONFIG_WDT_CDNS) += cdns_wdt.o
 obj-$(CONFIG_WDT_FTWDT010) += ftwdt010_wdt.o
-obj-$(CONFIG_WDT_GPIO) += gpio_wdt.o
+obj-$(CONFIG_$(SPL_TPL_)WDT_GPIO) += gpio_wdt.o
 obj-$(CONFIG_WDT_MAX6370) += max6370_wdt.o
 obj-$(CONFIG_WDT_MCF) += mcf_wdt.o
 obj-$(CONFIG_WDT_MESON_GXBB) += meson_gxbb_wdt.o
-- 
2.46.2