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658e4129bb
The reset line of the RTL8211F PHY is routed to the GPIOZ_15 pad. Describe this in the device tree so the PHY framework can bring the PHY into a known state when initializing it. GPIOZ_15 doesn't support driving the output HIGH (to take the PHY out of reset, only output LOW to reset the PHY is supported). The datasheet states it's an "3.3V input tolerant open drain (OD) output pin". Instead there's a pull-up resistor on the board to take the PHY out of reset. The GPIO itself will be set to INPUT mode to take the PHY out of reset and LOW to reset the PHY, which is achieved with the flags (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN). Acked-by: Neil Armstrong <narmstrong@baylibre.com> Tested-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com> |
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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.