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39b415f846
Add GPIO support to the simple helpers for the I2C OF component prober. Components that the prober intends to probe likely require their regulator supplies be enabled, and GPIOs be toggled to enable them or bring them out of reset before they will respond to probe attempts. Regulator supplies were handled in the previous patch. The assumption is that the same class of components to be probed are always connected in the same fashion with the same regulator supply and GPIO. The names may vary due to binding differences, but the physical layout does not change. This supports at most one GPIO pin. The user must specify the GPIO name, the polarity, and the amount of time to wait after the GPIO is toggled. Devices with more than one GPIO pin likely require specific power sequencing beyond what generic code can easily support. Signed-off-by: Chen-Yu Tsai <wenst@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Andrey Skvortsov <andrej.skvortzov@gmail.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.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.