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The driver used to be developed with legacy GPIO API support. It's better to use descriptor-based interface for several reasons. First of all the legacy API doesn't support the ACTIVE_LOW/HIGH flag of dts nodes, which is essential since different hardware may have different GPIOs connectivity including the logical value inversion. Secondly, by requesting the reset GPIO descriptor the driver prevent the other applications from changing its value. And last but not least the legacy GPIO interface should be avoided in the new code due to it obsolescence. Signed-off-by: Serge Semin <fancer.lancer@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.