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Single-channel converters such as mcp3001, mcp3201, mcp3301 and the upcoming mcp3550/1/3 lack a MOSI pin, so there's no need to call mcp320x_channel_to_tx_data() for them. Moreover, instead of calling spi_read() for these converters, which generates an spi_message and spi_transfer on the stack on every readout, it's more efficient to use the spi_message and spi_transfer[] included in struct mcp320x (as we do for multi-channel ADCs), but initialize the spi_message only with the receive transfer. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.