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The ROHM BD79124 is a 12-bit, 8-channel, SAR ADC. The ADC supports an automatic measurement mode, with an alarm interrupt for out-of-window measurements. The window is configurable for each channel. The I2C protocol for manual start of the measurement and data reading is somewhat peculiar. It requires the master to do clock stretching after sending the I2C slave-address until the slave has captured the data. Needless to say this is not well suopported by the I2C controllers. Thus do not support the BD79124's manual measurement mode but implement the measurements using automatic measurement mode, relying on the BD79124's ability of storing latest measurements into register. Support also configuring the threshold events for detecting the out-of-window events. The BD79124 keeps asserting IRQ for as long as the measured voltage is out of the configured window. Thus, prevent the user-space from choking on the events and mask the received event for a fixed duration (1 second) when an event is handled. The ADC input pins can be also configured as general purpose outputs. Make those pins which don't have corresponding ADC channel node in the device-tree controllable as GPO. Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com> Link: https://patch.msgid.link/ca3886c9abcb268ca976e62cd7da28bf5d6e6382.1742560649.git.mazziesaccount@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.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 reStructuredText 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.