[PATCH 3/4] rtc: add battery low voltage detection feature

[Hugo Villeneuve <hugo@hugovil.com>]

From: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Some RTCs have a battery low voltage detection function. Add new feature
so that it can be enabled, disabled or queried at runtime.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
---
 include/uapi/linux/rtc.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/rtc.h b/include/uapi/linux/rtc.h
index 97aca4503a6a3..596eec119bb3a 100644
--- a/include/uapi/linux/rtc.h
+++ b/include/uapi/linux/rtc.h
@@ -134,18 +134,23 @@ struct rtc_param {
 #define RTC_FEATURE_CORRECTION		5
 #define RTC_FEATURE_BACKUP_SWITCH_MODE	6
 #define RTC_FEATURE_ALARM_WAKEUP_ONLY	7
-#define RTC_FEATURE_CNT			8
+#define RTC_FEATURE_BATTERY_LOW_DETECT	8
+#define RTC_FEATURE_CNT			9
 
 /* parameter list */
 #define RTC_PARAM_FEATURES		0
 #define RTC_PARAM_CORRECTION		1
 #define RTC_PARAM_BACKUP_SWITCH_MODE	2
+#define RTC_PARAM_BATTERY_LOW_DETECT	3
 
 #define RTC_BSM_DISABLED	0
 #define RTC_BSM_DIRECT		1
 #define RTC_BSM_LEVEL		2
 #define RTC_BSM_STANDBY		3
 
+#define RTC_BATTERY_LOW_DETECT_DISABLED	0
+#define RTC_BATTERY_LOW_DETECT_ENABLED	1
+
 #define RTC_MAX_FREQ	8192
 
 
-- 
2.47.3