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[ Upstream commit 2e1f2d9a9bdbe12ee475c82a45ac46a278e8049a ] I2C implementation on this chip has a few key differences compared to SPI, as described in previous patches. * extended register space access needs no extra logic * slave address is used to select which UART to communicate with To accommodate these differences, add an I2C interface config, set the RevID register address and implement an empty method for setting the GlobalCommand register, since no special handling is needed for the extended register space. To handle the port-specific slave address, create an I2C dummy device for each port, except the base one (UART0), which is expected to be the one specified in firmware, and create a regmap for each I2C device. Add minimum and maximum slave addresses to each devtype for sanity checking. Also, use a separate regmap config with no write_flag_mask, since I2C has a R/W bit in its slave address, and set the max register to the address of the RevID register, since the extended register space needs no extra logic. Finally, add the I2C driver. Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Cosmin Tanislav <cosmin.tanislav@analog.com> Link: https://lore.kernel.org/r/20220605144659.4169853-5-demonsingur@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Stable-dep-of: 3f42b142ea11 ("serial: max310x: fix IO data corruption in batched operations") Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.