Re: [PATCH v3] rtc: ds1307: Add driver for Epson RX8901CE

[Fredrik M Olsson]

On 6/29/26 17:13, Fredrik M Olsson wrote:
> Adds support for:
> - Reading and writing time to/from the RTC.
> - Changing Backup Switch Mode (BSM) to DISABLED/DIRECT/LEVEL using the
>    RTC_PARAM_SET ioctl.
> - Optionally enabling battery charging.
> - Reading the battery voltage low status using the RTC_VL_READ ioctl
>    (only supported in LEVEL BSM), which also reports invalid time
>    information if the VLF flag is set.
>
> Signed-off-by: Fredrik M Olsson<fredrik.m.olsson@xxxxxxxx>
> ---
> Add basic support for the Epson RX8901CE RTC.
> Datasheet:https://download.epsondevice.com/td/pdf/app/RX8901CE_en.pdf
>
> Also includes a bug fix for an issue with reading the weekday from the
> RTC which affects both the existing rx8130 and this rx8901 driver.
> ---
> Changes in v3:
> - Clear CHGEN when trickle battery charging is disabled.
> - Link to v2:https://lore.kernel.org/r/20260520-ds1307-rx8901-add-v2-0- 
> e069ea32e1db@xxxxxxxx
>
> Changes in v2:
> - Squashed the Voltage Low status patch into the driver patch
> - Switch from dev_err to dev_dbg
> - Implement Backup Switch Mode (BSM) ioctl instead of hard coding
>    switching mode.
> - Change the prototype for the do_trickle_setup function pointer in
>    order to make it possible to propagate error codes from the added
>    PWSW_CFG register read operation. This read operation is added so not
>    to override previously set register fields.
> - Link to v1:https://lore.kernel.org/r/20251219-ds1307-rx8901-add-v1-0- 
> b13f346ebe93@xxxxxxxx

[...]

Friendly ping.

--
/Fredrik