[PATCH] Add powerpc get/set_rtc_time interface to new generic rtc class

[Kim Phillips]

Add powerpc get/set_rtc_time interface to new generic rtc class. This
abstracts rtc chip specific code from the platform code for rtc-over-i2c
platforms.  Specific RTC chip support is now configured under
Device Drivers -> Real Time Clock. Setting time of day from the RTC
on startup is also configurable.

Currently, the only default config in powerpc arch is the 8349 itx.
Other platforms wanting to consolidate code may also use this.

Signed-off-by: Kim Phillips <kim.phillips at freescale.com>

---
 arch/powerpc/kernel/time.c |   44 ++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 7a3c3f7..a231b6d 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -1048,6 +1048,50 @@ void __init time_init(void)
 	set_dec(tb_ticks_per_jiffy);
 }
 
+#ifdef CONFIG_RTC_CLASS
+int set_rtc_class_time(struct rtc_time *tm)
+{
+	int err;
+	struct class_device *class_dev =
+		rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
+
+	if (class_dev == NULL)
+		return -ENODEV;
+
+	err = rtc_set_time(class_dev, tm);
+
+	rtc_class_close(class_dev);
+
+	return 0;
+}
+
+void get_rtc_class_time(struct rtc_time *tm)
+{
+	int err;
+	struct class_device *class_dev =
+		rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
+
+	if (class_dev == NULL)
+		return;
+
+	err = rtc_read_time(class_dev, tm);
+
+	rtc_class_close(class_dev);
+
+	return;
+}
+
+static int __init rtc_class_hookup(void)
+{
+	ppc_md.get_rtc_time = get_rtc_class_time;
+	ppc_md.set_rtc_time = set_rtc_class_time;
+
+	return 0;
+}
+
+late_initcall(rtc_class_hookup);
+#endif /* CONFIG_RTC_CLASS */
+
 
 #define FEBRUARY	2
 #define	STARTOFTIME	1970
-- 
1.4.2.1