tree fa8835b2ef13e22c4d95b9f44dca327bdc8a63c8
parent 454ba154a62c8806e82a3581c5233a5176cd7dd7
author Philipp Rosenberger <p.rosenberger@kunbus.com> 1610960271 +0100
committer Alexandre Belloni <alexandre.belloni@bootlin.com> 1611617176 +0100

rtc: pcf2127: Disable Power-On Reset Override

To resume normal operation after a total power loss (no or empty
battery) the "Power-On Reset Override (PORO)" facility needs to be
disabled.

The register reset value sets the PORO enabled and the data sheet
recommends setting it to disabled for normal operation.

From what I've seen on the PCF2127 and PCF2129 there is no event
generated at the interrupt pin (INT), as long the PORO bit is set. This
behavior is not documented in the manual.

Signed-off-by: Philipp Rosenberger <p.rosenberger@kunbus.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210118085752.5759-2-p.rosenberger@kunbus.com