linux-kernel - [PATCH v3 0/2] Add a driver for Epson RX8111 RTC

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Date:   Mon, 20 Nov 2023 15:49:25 +0100
From:   Waqar Hameed <waqar.hameed@...s.com>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     <kernel@...s.com>, <linux-kernel@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <linux-rtc@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH v3 0/2] Add a driver for Epson RX8111 RTC

In this patch series we add a basic driver for Epson RX8111 RTC with
support for only reading/writing the time and the `ioctl`s `RTC_VL_READ`
and `RTC_VL_CLR`.

Datasheet: https://support.epson.biz/td/api/doc_check.php?dl=app_RX8111CE&lang=en

Changes in v3:
* Remove macro define `RX8111_DRV_NAME` for the driver name.
* Remove macro function `RX8111_TIME_BUF_IDX` and instead use the
  offsets as indices directly.
* Remove `rx8111_setup()` that disabled extended functionality and
  interrupts.
* Remove comments explaining register value conversions in
  `rx8111_read/set_time()`.
* Check/clear register flag XST (oscillation stoppage) in
  `rx8111_read/set_time()`.
* Change `vlval` to `unsigned int` in `rx8111_ioctl()`.
* Remove `case RTC_VL_CLR` in `rx8111_ioctl()`.
* Convert all `dev_err()` to `dev_dbg()`.
* Convert all `dev_err_probe()` to `dev_dbg()` in probe.
* Return without printing from `devm_rtc_register_device()` in probe.

Link to v2: https://lore.kernel.org/lkml/cover.1692699931.git.waqar.hameed@axis.com/

Changes in v2:
* Move dt-bindings to `trivial-rtc.yaml`.

Link to v1: https://lore.kernel.org/lkml/cover.1691158774.git.waqar.hameed@axis.com/

Waqar Hameed (2):
  dt-bindings: rtc: Add Epson RX8111
  rtc: Add driver for Epson RX8111

 .../devicetree/bindings/rtc/trivial-rtc.yaml  |   1 +
 drivers/rtc/Kconfig                           |  10 +
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-rx8111.c                      | 356 ++++++++++++++++++
 4 files changed, 368 insertions(+)
 create mode 100644 drivers/rtc/rtc-rx8111.c

base-commit: 98b1cc82c4affc16f5598d4fa14b1858671b2263
-- 
2.30.2