watchdog: Add hardware dependency to BCM7038 driver

The BCM7038 watchdog driver is specific to Broadcom ARM and MIPS
SoCs so do not present it on other architectures, unless
build-testing.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Justin Chen <justinpopo6@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index fc1b2959c0b3..5f29f72f4691 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1380,10 +1380,12 @@ config BCM7038_WDT
         tristate "BCM7038 Watchdog"
         select WATCHDOG_CORE
         depends on HAS_IOMEM
+        depends on ARCH_BRCMSTB || BMIPS_GENERIC || COMPILE_TEST
         help
-         Watchdog driver for the built-in hardware in Broadcom 7038 SoCs.
-
-         Say 'Y or 'M' here to enable the driver.
+         Watchdog driver for the built-in hardware in Broadcom 7038 and
+         later SoCs used in set-top boxes.  BCM7038 was made public
+         during the 2004 CES, and since then, many Broadcom chips use this
+         watchdog block, including some cable modem chips.
 
 config IMGPDC_WDT
         tristate "Imagination Technologies PDC Watchdog Timer"