Documentation: dmaengine: Add a description of what dmatest does
Currently it can difficult to determine what dmatest does without reading the source code. Let's add a description. The description is taken mostly from the patch header of commit 4a776f0a ("dmatest: Simple DMA memcpy test client"). It has been edited and updated slightly. Nevertheless the new text was largely written by Haarvard Skinnemoen and was copied from another patch, already committed to the kernel, which has Haarvard's SoB: attached to it. Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20211118100952.27268-2-daniel.thompson@linaro.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
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