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cd803da7c0
Old revisions of the ROCK 4D board have a dedicated crystal to
supply the RTL8211F PHY's 25MHz clock input. At least some newer
revisions instead use REFCLKO25M_GMAC0_OUT. The DT already has
this half-prepared, but there are some issues:
1. The DT relies on auto-selecting the right PHY driver, which
requires that it works good enough to read the ID registers.
This does not work without the clock, which is handled by
the PHY driver. By updating the compatible to contain the
RTL8211F IDs, so that the operating system can choose the
right PHY driver without relying on a pre-powered PHY.
2. Despite the name REFCLKO25M_GMAC0_OUT could also provide a
different frequency, so ensure it is explicitly set to 25
MHz as expected by the PHY.
3. While at it switch from deprecated "enable-gpio" to standard
"enable-gpios".
Fixes: a0fb7eca9c ("arm64: dts: rockchip: Add Radxa ROCK 4D device tree")
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20250704-rk3576-rock4d-phy-handling-fixes-v1-1-1d64130c4139@kernel.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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.