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The CS4234 is a highly versatile CODEC that combines 4 channels of high performance analog to digital conversion, 4 channels of high performance digital to analog conversion for audio, and 1 channel of digital to analog conversion to provide a nondelayed audio reference signal to an external Class H tracking power supply. DAC5 is only supported as a 5th audio channel. Tracking Power Supply mode is not currently supported by the driver. In DSP_A mode the slots for DAC1-4 and optionally DAC5 can be set. The codec always claims 4 slots for DAC1-4 and these must be in the same nibble of the mask. The codec has a fixed mapping for ADC slots. In I2S/LJ modes the codec has a fixed mapping for DAC1-4 and ADC1-4. DAC5 is not available in these modes. The MCLK source must be preset to a valid frequency before probe() because it must be running all the time the codec is out of reset. The VA_SEL bit will be set automatically to 3.3v or 5v during probe() based on the reported voltage of the regulator supplying VA. Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com> Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com> Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Link: https://lore.kernel.org/r/20200928111821.26967-2-rf@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.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.