97ec136e71
On AXP221 and later AXP PMICs that have the N_VBUSEN pin, when this pin is high, either due to the PMIC driving it high or as an input, the VBUS detection related interrupt mechanisms are disabled. Previously this was worked around in the phy-sun4i-usb driver, which needed to sense VBUS changes and report them to the musb driver in a timely matter. However this workaround was only for the A31 and A33 type USB PHYs. To support newer platforms we would have to enable it for almost all the post-A31 SoCs. However, since this is actually the result of the PMIC's behavior, the workaround would be better if done in the PMIC driver, in this case the VBUS power supply driver. Add the same workqueue-based polling to the VBUS power supply driver. The polling interval is chosen to be the debounce interval from the USB PHY driver, as this short interval is needed in some cases, but the power supply driver would not know when. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.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 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.