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Situation for 'i2s-lrck': Should use flag GPIOD_ASIS not to reclaim LRCK pin as GPIO function, because we use the same PIN and just read EXT_PORT value which show the pin status. Situation for 'tdm-fsync': A. when the pin is a generic gpio as the ref signal pin which is drived from external. should use flag GPIOD_IN to reclaim as GPIO_IN function. B. when the pin is the same pin from the 'clk-src' on the same SoC, we can use the 'clk-src' fsync out signal as the 'tdm-fsync' to query status. in this case, should use flag GPIOD_ASIS not to reclaim it as GPIO. Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com> Change-Id: I529d982a7e49cb90c02b7670a58759607f4e4f32
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.