[PATCH 01/17] rtc: define RTC_VL_READ values

[Alexandre Belloni]

Currently, the meaning of the value returned by RTC_VL_READ is undocumented
and left to the driver implementation. In order to get more meaningful
values, define a set of values to use as to make clear to userspace what is
the status of the various voltages feeding the RTC.

Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
---
 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 2ad1788968d0..095af360326a 100644
--- a/include/uapi/linux/rtc.h
+++ b/include/uapi/linux/rtc.h
@@ -92,7 +92,12 @@ struct rtc_pll_info {
 #define RTC_PLL_GET	_IOR('p', 0x11, struct rtc_pll_info)  /* Get PLL correction */
 #define RTC_PLL_SET	_IOW('p', 0x12, struct rtc_pll_info)  /* Set PLL correction */
 
-#define RTC_VL_READ	_IOR('p', 0x13, int)	/* Voltage low detector */
+#define RTC_VL_DATA_INVALID	BIT(0) /* Voltage too low, RTC data is invalid */
+#define RTC_VL_BACKUP_LOW	BIT(1) /* Backup voltage is low */
+#define RTC_VL_BACKUP_EMPTY	BIT(2) /* Backup empty or not present */
+#define RTC_VL_ACCURACY_LOW	BIT(3) /* Voltage is low, RTC accuracy is reduced */
+
+#define RTC_VL_READ	_IOR('p', 0x13, unsigned int)	/* Voltage low detection */
 #define RTC_VL_CLR	_IO('p', 0x14)		/* Clear voltage low information */
 
 /* interrupt flags */
-- 
2.23.0