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[0/2] Implement EPSON RX-8035 support

Message ID 20210707071616.28976-1-matt@traverse.com.au
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Series Implement EPSON RX-8035 support | expand

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Mathew McBride July 7, 2021, 7:16 a.m. UTC 
The EPSON RX-8035[SA] is a I2C real time clock module with
built-in oscillator[1]. It is a very close relative of the EPSON
RX-8025 that is supported by the rtc-rx8025 driver.

The main difference is that the RX-8035 has inverted the
'oscillator stop' bit in the control register. The operation
of the devices is otherwise identical for the features currently
supported.

Curiously, the RX-8025 is also supported by the ds1307 driver
as the time register set is compatible. The control registers,
however, are not.

I have decided to implement the RX-8035 in rtc-rx8025 due the simplicity
of that driver.

As best as I can determine, the rtc-rx8025 driver was in the tree
some months[1] before rx8025 support was added to ds1307[2]. 

[1] - https://www5.epsondevice.com/en/products/rtc/rx8035sa.html
[2] - commit 3c2b9075cbdb541dbe486bde45925c9610de6f35
[3] - commit a216685818a54b4f15235068b53908f954850251

Mathew McBride (2):
  rtc: rx8025: implement RX-8035 support
  dt-bindings: rtc: add Epson RX-8025 and RX-8035

 .../devicetree/bindings/rtc/trivial-rtc.yaml  |  3 +
 drivers/rtc/rtc-rx8025.c                      | 59 +++++++++++++++++--
 2 files changed, 56 insertions(+), 6 deletions(-)

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2.30.1