On 10/11/2021 15:03:49+0100, Camel Guo wrote:

quoted

On 10/11/2021 12:54:54+0100, Camel Guo wrote:

quoted

From: Camel Guo <redacted>
+     switch (cmd) {
+     case RTC_VL_READ:
+             flags = 0;
+
+             switch (rs5c->type) {
+             case rtc_r2025sd:
+             case rtc_r2221tl:
+                     if ((rs5c->type == rtc_r2025sd && !(ctrl2 & R2x2x_CTRL2_XSTP)) ||
+                             (rs5c->type == rtc_r2221tl &&  (ctrl2 & R2x2x_CTRL2_XSTP))) {
+                             flags |= RTC_VL_DATA_INVALID;
+                     }
+                     if (ctrl2 & R2x2x_CTRL2_VDET)
+                             flags |= RTC_VL_ACCURACY_LOW;

Shouldn't that be RTC_VL_BACKUP_LOW?

Some drivers (e.g: rv3029_ioctl and rv8803_ioctl) use RTC_VL_ACCURACY_LOW,
but some other drivers (e.g: abx80x_ioctl, pcf2127_rtc_ioctl and
pcf8523_rtc_ioctl) use RTC_VL_BACKUP_LOW instead. Is there any guideline or
document telling the differences between them?

RTC_VL_BACKUP_LOW: The backup voltage is low
RTC_VL_ACCURACY_LOW: the primary or backup voltage is low, temperature
compensation (or similar) has stopped

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com