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6a4d4a27f9
The TPS6598x PD controller provides an active-high hardware reset input that reinitializes all device settings. If it is not grounded by design, the driver must be able to de-assert it in order to initialize the device. The PD controller is not ready for registration right after the reset de-assertion and a delay must be introduced in that case. According to TI, the delay can reach up to 1000 ms [1], which is in line with the experimental results obtained with a TPS65987D. Add a GPIO descriptor for the reset signal and basic reset management for initialization and suspend/resume. [1] https://e2e.ti.com/support/power-management-group/power-management/ f/power-management-forum/1269856/tps65987d-tps65987d-reset-de-assert- to-normal-operation/4809389#4809389 Signed-off-by: Javier Carrasco <javier.carrasco@wolfvision.net> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20230912-topic-tps6598x_reset-v3-1-0c2873070a77@wolfvision.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.