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[0/8] rtc: expand charge support, implement rx8130 charging

Message ID 20200907142727.26472-1-bst@pengutronix.de
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Series rtc: expand charge support, implement rx8130 charging | expand

Message

Bastian Krause Sept. 7, 2020, 2:27 p.m. UTC 
In order to preserve previous RTC charging behavior while allowing to
add new charging configurations this series adds the dt property
aux-voltage-chargeable as a uint enum. It supersedes the
trickle-diode-disable flag.

Then the ds1307 driver's charging infrastructure is generalized:

- support charging on 'aux-voltage-chargeable = <1>'
- keep the previous charge default per chip
- make trickle-resistor-ohms optional for charging
- apply DS13XX_TRICKLE_CHARGER_MAGIC only conditionally

This preparatory work allows to enable Epson's RX8130 backup
battery and make it chargeable when 'aux-voltage-chargeable = <1>' is
given.

I decided to create a new series for this as the patches of previous
efforts changed drastically:

- https://lore.kernel.org/linux-rtc/20190628002151.4925-1-marex@denx.de/
- https://lore.kernel.org/linux-rtc/20190905130336.10651-1-marex@denx.de/
- https://lore.kernel.org/linux-rtc/98fa7181-3ebe-d7c3-cfac-fee841c81e15@pengutronix.de/T/

Regards,
Bastian

Bastian Krause (8):
  dt-bindings: rtc: let aux-voltage-chargeable supersede
    trickle-diode-disable
  dt-bindings: rtc: ds1307: let aux-voltage-chargeable supersede
    trickle-diode-disable
  dt-bindings: rtc: ds1307: add rx8130 aux-voltage-chargeable support
  rtc: ds1307: apply DS13XX_TRICKLE_CHARGER_MAGIC only conditionally
  rtc: ds1307: introduce requires_trickle_resistor per chip
  rtc: ds1307: store previous charge default per chip
  rtc: ds1307: consider aux-voltage-chargeable
  rtc: ds1307: enable rx8130's backup battery, make it chargeable
    optionally

 .../devicetree/bindings/rtc/rtc-ds1307.txt    |  9 ++-
 .../devicetree/bindings/rtc/rtc.yaml          | 10 ++++
 drivers/rtc/rtc-ds1307.c                      | 58 +++++++++++++++++--
 3 files changed, 71 insertions(+), 6 deletions(-)