rtc: k3: wait until the unlock field is not zero

After writing the magic words to the KICK0 and KICK1 registers, we must
wait for a 1 in the unlock field of the general control register to
signify when the rtc device is in an unlocked state.

Signed-off-by: Bryan Brattlof <bb@ti.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220816173312.23243-1-bb@ti.com

Author: bryanbrattlof

drivers/rtc/rtc-ti-k3.c

@@ -190,7 +190,7 @@ static int k3rtc_unlock_rtc(struct ti_k3_rtc *priv)
 
 	/* Skip fence since we are going to check the unlock bit as fence */
 	ret = regmap_field_read_poll_timeout(priv->r_fields[K3RTC_UNLOCK], ret,
-					     !ret, 2, priv->sync_timeout_us);
+					     ret, 2, priv->sync_timeout_us);
 
 	return ret;
 }