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[ Upstream commita7361b9c46] The RX/TX delays for the Ethernet PHY on the Linksprite pcDuino 3 Nano are configured in hardware, using resistors that are populated to pull the RTL8211E's RXDLY/TXDLY pins low or high as needed. phy-mode should be set to rgmii-id to reflect this. Previously it was set to rgmii, which used to work but now results in the delays being disabled again as a result of the bugfix in commitbbc4d71d63("net: phy: realtek: fix rtl8211e rx/tx delay config"). Tested on two pcDuino 3 Nano boards purchased in 2015. Without this fix, Ethernet works unreliably on one board and doesn't work at all on the other. Fixes:061035d456("ARM: dts: sun7i: Add dts file for pcDuino 3 Nano board") Signed-off-by: Adam Sampson <ats@offog.org> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Chen-Yu Tsai <wens@csie.org> Link: https://lore.kernel.org/r/20201123174739.6809-1-ats@offog.org Signed-off-by: Sasha Levin <sashal@kernel.org>
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.