Ilya Lipnitskiy 4732315ca9 net: dsa: mt7530: clean up core and TRGMII clock setup
Three minor changes:

- When disabling PLL, there is no need to call core_write_mmd_indirect
  directly, use the core_write wrapper instead like the rest of the code
  in the function does. This change helps with consistency and
  readability. Move the comment to the definition of
  core_read_mmd_indirect where it belongs.

- Disable both core and TRGMII Tx clocks prior to reconfiguring.
  Previously, only the core clock was disabled, but not TRGMII Tx clock.
  So disable both, then configure them, then re-enable both, for
  consistency.

- The core clock enable bit (REG_GSWCK_EN) is written redundantly three
  times. Simplify the code and only write the register only once at the
  end of clock reconfiguration to enable both core and TRGMII Tx clocks.

Tested on Ubiquiti ER-X running the GMAC0 and MT7530 in TRGMII mode.

Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-03-28 17:55:12 -07:00
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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.
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