We can build this driver with or without NVMEM, but not built-in
when NVMEM is a loadable module:

drivers/watchdog/rave-sp-wdt.o: In function `rave_sp_wdt_probe':
rave-sp-wdt.c:(.text+0x27c): undefined reference to `nvmem_cell_get'
rave-sp-wdt.c:(.text+0x290): undefined reference to `nvmem_cell_read'
rave-sp-wdt.c:(.text+0x2c4): undefined reference to `nvmem_cell_put'

This adds a Kconfig dependency to enforce that.

Fixes: c3bb33345721 ("watchdog: Add RAVE SP watchdog driver")
Signed-off-by: Arnd Bergmann <[email protected]>
---
 drivers/watchdog/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 34d1c6851fa7..c09369f80989 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -226,6 +226,7 @@ config ZIIRAVE_WATCHDOG
 config RAVE_SP_WATCHDOG
        tristate "RAVE SP Watchdog timer"
        depends on RAVE_SP_CORE
+       depends on NVMEM || !NVMEM
        select WATCHDOG_CORE
        help
          Support for the watchdog on RAVE SP device.
-- 
2.9.0

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