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a474e52c31
Since the MMC/SD controller in Ingenic SoCs work in half-duplex, it is possible to use one single DMA channel for both TX and RX operations, instead of using separate channels. As some older Ingenic SoCs offer only a handful of DMA channels, supporting bi-directional channels allow more hardware to use the channels that would otherwise be used for the MMC/SD operation. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20211220190840.108061-3-paul@crapouillou.net Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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.