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c912f19ee3
This patch removes the hard coded assumption that the TX ring uses hardware FIFO 1. This allows the hardware FIFO 1 to be used for RX and the next free FIFO for TX. This gives the opportunity to minimize the number of SPI transfers in the IRQ handler. The read of the IRQ status register and RX FIFO status registers can be combined into single SPI transfer. If the RX ring uses FIFO 1, the overall length of the transfer is smaller than in the original layout, where the RX FIFO comes after the TX FIFO. Link: https://lore.kernel.org/all/20220217103826.2299157-2-mkl@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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.