[PATCH] rtc: pcf2123: Fix build error

[YueHaibing]

If REGMAP_SPI is m and RTC_DRV_PCF2123 is y,

drivers/rtc/rtc-pcf2123.o: In function `pcf2123_probe':
rtc-pcf2123.c:(.text+0xb2b): undefined reference to `__devm_regmap_init_spi'

Select REGMAP_SPI as RTC_DRV_DS1347 driver does.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 790d033933b8 ("rtc: pcf2123: port to regmap")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/rtc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 3bfc04a..e72f65b 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -820,6 +820,7 @@ config RTC_DRV_MAX6902
 
 config RTC_DRV_PCF2123
 	tristate "NXP PCF2123"
+	select REGMAP_SPI
 	help
 	  If you say yes here you get support for the NXP PCF2123
 	  RTC chip.
-- 
2.7.4