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There is no point in splitting read/write channels. First of all, eDMA read and write channels belong to one physical controller. Secondly, channel differentiation can be done by filtering and dma_get_slave_caps(). Finally, having these channels handled separately needlessly complicates the code and causes this debugfs warning: debugfs: Directory '1f052000.pcie' with parent 'dmaengine' already present! Join the read/write channels into a single DMA device. Client drivers can choose the correct channel via the DMA slave direction setting. The default value is overridden by the dw_edma_device_caps() callback in accordance with the channel type. Link: https://lore.kernel.org/r/20230113171409.30470-18-Sergey.Semin@baikalelectronics.ru Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Acked-by: Vinod Koul <vkoul@kernel.org> |
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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.