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Seeing the DW I2C driver is using flags-based accessors with two conditional clauses it would be better to replace them with the regmap API IO methods and to initialize the regmap object with read/write callbacks specific to the controller registers map implementation. This will be also handy for the drivers with non-standard registers mapping (like an embedded into the Baikal-T1 System Controller DW I2C block, which glue-driver is a part of this series). As before the driver tries to detect the mapping setup at probe stage and creates a regmap object accordingly, which will be used by the rest of the code to correctly access the controller registers. In two places it was appropriate to convert the hand-written read-modify-write and read-poll-loop design patterns to the corresponding regmap API ready-to-use methods. Note the regmap IO methods return value is checked only at the probe stage. The rest of the code won't do this because basically we have MMIO-based regmap so non of the read/write methods can fail (this also won't be needed for the Baikal-T1-specific I2C controller). Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> [wsa: fix type of 'rx_valid' and remove outdated kdoc var description] Signed-off-by: Wolfram Sang <wsa@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.