• A
    of: add vendor prefix for Abracon Corporation · 446810f2
    Arnaud Ebalard 提交于
    This series adds support for Abracon AB-RTCMC-32.768kHz-B5ZE-S3 I2C RTC
    chip. Unlike many RTC chips, it includes an internal oscillator which
    spares room on the PCB. It also has some interesting features, like
    battery low detection (which the driver in this series supports). The
    only small "limitation" (mainly due to what RTC subsystem expects from
    RTC chips) is the fact that its alarm is accurate to the second. This
    series provides a solution (described below) for that limitation using
    another mechanism of the chip.
    
    I decided to split support between three different patches for
    this v0:
    
    - Patch 1/3: it simply references Abracon Corporation in vendor-prefixes
      documentation file. As Abracon has no NASDAQ ticker symbol; I have
      decided to use "abcn" (I initially started my work w/ "ab" but later
      changed for "abcn" which looked more meaningful)
    - Patch 2/3: it adds initial support for the chip and provides the
      ability to read/write time and also read/write alarm. As the alarm
      the chip provides is accurate to the minute, the support provided
      by this patch also has this limitation (e.g. UIE mode is not
      supported).
    - Patch 3/3: the chip supports a watchdog timer which can be used to
      extend the alarm mechanism in patch 2/3 in order to provide support
      for alarms under one minute (e.g. support UIE mode). In practice,
      the logic I implemented is to use the watchdog timer for alarms which
      are at most 4 minutes in the future and use the common alarm mechanism
      for alarms which are set to larger values. With that additional patch
      the device fully passes the rtctest.c program.
    
    I decided to split the driver between two patches (2 and 3 of 3) in
    order to ease review: patch 2 should be pretty straightforward to read
    for someone familiar w/ RTC subsystem. Patch 3 only extends what is in
    patch 2 regarding alarms.
    
    This patch (of 3):
    
    Documentation/devicetree/bindings/vendor-prefixes.txt: add vendor prefix
    for Abracon Corporation
    Signed-off-by: NArnaud Ebalard <arno@natisbad.org>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Alessandro Zummo <a.zummo@towertech.it>
    Cc: Peter Huewe <peter.huewe@infineon.com>
    Cc: Linus Walleij <linus.walleij@linaro.org>
    Cc: Thierry Reding <treding@nvidia.com>
    Cc: Mark Brown <broonie@kernel.org>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Cc: Rob Herring <robherring2@gmail.com>
    Cc: Pawel Moll <pawel.moll@arm.com>
    Cc: Stephen Warren <swarren@wwwdotorg.org>
    Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
    Cc: Grant Likely <grant.likely@linaro.org>
    Cc: Rob Landley <rob@landley.net>
    Cc: Jason Cooper <jason@lakedaemon.net>
    Cc: Guenter Roeck <linux@roeck-us.net>
    Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
    Cc: Kumar Gala <galak@codeaurora.org>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    446810f2
vendor-prefixes.txt 5.4 KB