tree b81d8944dfeb384edeca966e07c6d23c017093a3
parent ce86031bdd86b98515c50b50a5ed3d760de282ca
author Philipp Tomsich <philipp.tomsich@theobroma-systems.com> 1543356019 +0100
committer Philipp Tomsich <philipp.tomsich@theobroma-systems.com> 1544432685 +0100

bootcount: add a DM RTC backing store for bootcount

This implements a driver using a RTC-based backing store for the DM
bootcount implementation.  The node configuring this feature will be
compatible with 'u-boot,bootcount-rtc' and the underlying RTC device
shall be reference through the property 'rtc'. An offset into the RTC
device's register space can be provided through the 'offset' property.

Tested on a RK3399-Q7 on a Flamingo carrier board using the SRAM area
of the carrier board's RV3029 RTC.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>