Support byte access in the RTC7301 driver

This augments the Epson RTC7301 driver so that is supports
both 8bit byte and 32bit word access.

To: Alessandro Zummo <a.zummo@towertech.it>
To: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Rob Herring <robh+dt@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
To: Conor Dooley <conor+dt@kernel.org>
To: Akinobu Mita <akinobu.mita@gmail.com>
To: Howard Harte <hharte@magicandroidapps.com>
Cc: linux-rtc@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

---
Changes in v3:
- Use a default in the binding to encode 32bit (4 bytes) reg width
  as default.
- Collect Rob's ACK.
- Link to v2: https://lore.kernel.org/r/20231007-rtc-7301-regwidth-v2-0-c913aa95f666@linaro.org

Changes in v2:
- Specify that the reg-io-width default is 4 if not specified in the
  device tree.
- Fix spelling in driver comment.
- Print error and exit if an invalid width is specified.
- Link to v1: https://lore.kernel.org/r/20230921-rtc-7301-regwidth-v1-0-1900556181bf@linaro.org

---
Linus Walleij (2):
      rtc: rtc7301: Rewrite bindings in schema
      rtc: rtc7301: Support byte-addressed IO

 .../devicetree/bindings/rtc/epson,rtc7301.txt      | 16 -------
 .../devicetree/bindings/rtc/epson,rtc7301.yaml     | 51 ++++++++++++++++++++++
 drivers/rtc/rtc-r7301.c                            | 35 ++++++++++++++-
 3 files changed, 84 insertions(+), 18 deletions(-)
---
base-commit: 0bb80ecc33a8fb5a682236443c1e740d5c917d1d
change-id: 20230921-rtc-7301-regwidth-18ba1e3d0edb

Best regards,