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The Allwinner H6 SoC contains two SPI controllers similar to the H3/A64, but with the added capability of 3-wire and 4-wire operation modes. For now the driver does not support those, but the SPI registers are fully backwards-compatible, just adding bits and registers which were formerly reserved. So we can use the existing driver in "legacy" SPI modes, for instance to access the SPI NOR flash soldered on the PineH64 board. We use an H6 specific compatible string in addition to the existing H3 string, so when the driver later gains QSPI support, it should work automatically without any DT changes. Tested by accessing the SPI flash on a Pine H64 board (SPI0), also connecting another SPI flash to the 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.