dsa: mv88e6xxx: make serdes SGMII/Fiber tx amplitude configurable

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The mv88e6352, mv88e6240 and mv88e6176  have a serdes interface. This patch
allows to configure the output swing to a desired value in the
phy-handle of the port. The value which is peak to peak has to be
specified in microvolts. As the chips only supports eight dedicated
values we return EINVAL if the value in the DTS does not match one of
these values.

Signed-off-by: Holger Brunck <holger.brunck@hitachienergy.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Marek Behún <kabel@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Holger Brunck 2022-02-10 18:48:23 +01:00 • committed by David S. Miller

parent 066c4b6ba0

commit 926eae6044

4 changed files with 70 additions and 0 deletions

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23

drivers/net/dsa/mv88e6xxx/chip.c

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4

drivers/net/dsa/mv88e6xxx/chip.h

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38

drivers/net/dsa/mv88e6xxx/serdes.c

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5

drivers/net/dsa/mv88e6xxx/serdes.h

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