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0f18f728ba
Add DMA configuration in stm32mp15x uart nodes by selecting dma direct mode and alternate REQ/ACK dma protocol for uart. DMA direct mode allows to bypass DMA FIFO. Each DMA request immediately initiates a transfer from/to the memory. This allows USART to get data transferred, even when the transfer ends before the DMA FIFO completion. Default REQ/ACK DMA protocol consists in maintaining ACK signal up to the removal of REQuest and the transfer completion. In case of alternative REQ/ACK protocol, ACK de-assertion does not wait the removal of the REQuest, but only the transfer completion. Due to a possible DMA stream lock when transferring data to/from STM32 USART/UART, select this alternative protocol in STM32 USART/UART nodes. Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com> Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
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.