rtc: move date.c from drivers/rtc/ to lib/

In the next commit, rtc_mktime(), for compatibility with linux, will be
implemented using rtc_mktime(), which is no longer drivers/rtc specific.
So move this file under lib/.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>

cmd/Kconfig

@@ -1625,6 +1625,7 @@ config CMD_LED
 config CMD_DATE
 	bool "date"
 	default y if DM_RTC
+	select LIB_DATE
 	help
 	  Enable the 'date' command for getting/setting the time/date in RTC
 	  devices.

drivers/rtc/Kconfig

@@ -7,6 +7,7 @@ menu "Real Time Clock"
 config DM_RTC
 	bool "Enable Driver Model for RTC drivers"
 	depends on DM
+	select LIB_DATE
 	help
 	  Enable drver model for real-time-clock drivers. The RTC uclass
 	  then provides the rtc_get()/rtc_set() interface, delegating to

drivers/rtc/Makefile

@@ -7,7 +7,6 @@
 obj-$(CONFIG_$(SPL_TPL_)DM_RTC) += rtc-uclass.o
 
 obj-$(CONFIG_RTC_AT91SAM9_RTT) += at91sam9_rtt.o
-obj-y += date.o
 obj-y += rtc-lib.o
 obj-$(CONFIG_RTC_DAVINCI) += davinci.o
 obj-$(CONFIG_RTC_DS1302) += ds1302.o

lib/Kconfig

@@ -574,4 +574,7 @@ config TEST_FDTDEC
 	bool "enable fdtdec test"
 	depends on OF_LIBFDT
 
+config LIB_DATE
+	bool
+
 endmenu

lib/Makefile

@@ -117,4 +117,6 @@ else
 obj-y += vsprintf.o strto.o
 endif
 
+obj-y += date.o
+
 subdir-ccflags-$(CONFIG_CC_OPTIMIZE_LIBS_FOR_SPEED) += -O2

lib/date.c

@@ -9,8 +9,7 @@
 #include <errno.h>
 #include <rtc.h>
 
-#if defined(CONFIG_CMD_DATE) || defined(CONFIG_DM_RTC) || \
-				defined(CONFIG_TIMESTAMP)
+#if defined(CONFIG_LIB_DATE) || defined(CONFIG_TIMESTAMP)
 
 #define FEBRUARY		2
 #define	STARTOFTIME		1970
@@ -97,4 +96,4 @@ unsigned long rtc_mktime(const struct rtc_time *tm)
 	return (hours * 60 + tm->tm_min) * 60 + tm->tm_sec;
 }
 
-#endif
+#endif /* CONFIG_LIB_DATE || CONFIG_TIMESTAMP */