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554581b791
The Allwinner R40 SoC contains four SPI controllers, using the newer sun6i design (but at the legacy addresses). The controller seems to be fully compatible to the A64 one, so no driver changes are necessary. The first three controllers can be used on two sets of pins, but SPI3 is only routed to one set on Port A. Only the pin groups for SPI0 on PortC and SPI1 on PortI are added here, because those seem to be the only one exposed on the Bananapi boards. Tested by connecting a SPI flash to a Bananapi M2 Berry SPI0 and SPI1 header pins. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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.