[patch] drivers, mfd: fix tps65912 link error when core mfd is amodule

[David Rientjes]

CONFIG_MFD_CORE must be statically linked if CONFIG_MFD_TPS65912 is
selected, otherwise it results in a link error:

	drivers/built-in.o: In function `tps65912_device_init':
	(.text+0x587e4): undefined reference to `mfd_add_devices'
	drivers/built-in.o: In function `tps65912_device_init':
	(.text+0x5884c): undefined reference to `mfd_remove_devices'
	drivers/built-in.o: In function `tps65912_device_exit':
	(.text+0x58878): undefined reference to `mfd_remove_devices'

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 drivers/mfd/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -805,6 +805,7 @@ config MFD_TPS65910
 config MFD_TPS65912
 	bool "TI TPS65912 Power Management chip"
 	depends on GPIOLIB
+	select MFD_CORE
 	help
 	  If you say yes here you get support for the TPS65912 series of
 	  PM chips.
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