From: Mathew McBride <matt@traverse.com.au>
To: linux-rtc@vger.kernel.org,
Alessandro Zummo <a.zummo@towertech.it>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Rob Herring <robh+dt@kernel.org>,
devicetree@vger.kernel.org
Cc: Mathew McBride <matt@traverse.com.au>
Subject: [PATCH v2 0/2] rtc: Implement support for EPSON RX-8035
Date: Fri, 9 Jul 2021 04:45:16 +0000 [thread overview]
Message-ID: <20210709044518.28769-1-matt@traverse.com.au> (raw)
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
Changes in v2:
Coding style fixes as per suggestions
Use 'model' instead of 'type' in drvdata
Call rx8025_is_osc_stopped in a consistent manner
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, 57 insertions(+), 5 deletions(-)
--
2.30.1
next reply other threads:[~2021-07-09 4:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-09 4:45 Mathew McBride [this message]
2021-07-09 4:45 ` [PATCH v2 1/2] rtc: rx8025: implement RX-8035 support Mathew McBride
2021-07-19 8:15 ` Nobuhiro Iwamatsu
2021-07-09 4:45 ` [PATCH v2 2/2] dt-bindings: rtc: add Epson RX-8025 and RX-8035 Mathew McBride
2021-07-14 23:15 ` Rob Herring
2021-07-19 8:18 ` Nobuhiro Iwamatsu
2021-08-17 22:08 ` [PATCH v2 0/2] rtc: Implement support for EPSON RX-8035 Alexandre Belloni
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