Hello, This patch series adds the nxp,battery-backed device tree property to the PCF2127 RTC driver. This flag indicates if the RTC is battery-backed, allowing the driver to enable the battery switchover function if necessary. Background ---------- The PCF2127 RTC driver currently supports the PCF2127, PCA2129, PCF2129, and PCF2131 devices. Among these, only the newer PCF2131 has a different default behavior for battery switchover: it is disabled by default, whereas it is enabled on the other devices. If there is no firmware or bootloader setting to enable battery switchover on the PCF2131, it will not automatically switch to battery power, even if a battery is attached. An alternative approach would be to enable battery switchover by default on the PCF2131 without requiring a device tree property. However, this could be undesirable, as it would make it impossible to disable battery switchover. Thank you. Link [V2] https://patchwork.ozlabs.org/project/rtc-linux/list/?series=429144 Changes for V3: - The nxp,battery-switch-over property was replaced with a boolean nxp,battery-backed flag - The register vales are not encoded in the device tree any more - The driver enables battery switch-over in standard mode if the dt flag is set. Changes for V2: - v1 was corrupted due to our company mail server settings. No functional changes have been made; this version is identical to v1. Philipp Rosenberger (2): dt-bindings: rtc: pcf2127: Add nxp,battery-backed flag rtc: pcf2127: Add 'nxp,battery-switchover' DT property to enable battery switch-over .../devicetree/bindings/rtc/nxp,pcf2127.yaml | 7 ++ drivers/rtc/rtc-pcf2127.c | 76 +++++++++++++++---- 2 files changed, 68 insertions(+), 15 deletions(-) -- 2.39.5
