net: mdio: realtek-rtl9300: Add support for RTL838x

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The MDIO driver has been prepared for multiple device support. Add all
required bits for the RTL838x (aka maple) series. This is straightforward
but some things are worth mentioning.

- The device has a lot in common with the RTL930x series. It has 28 ports,
  4096 (Realtek) pages and 4 MMIO registers. With this a lot of the
  existing RTL9300 defines could be reused. But to avoid confusion and
  for better readability duplicate the defines with a proper prefix.
- The MDIO engine has no fail bit. Thus the mask is set to zero.
- There is only one SMI bus for 1G PHYs. No bus_map_base register exists.
- The setup_controller() function needs no C45 configuration as polling
  only works in C22 mode
- The PHY access must be activated by a special register flag.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260831143439.2404484-12-markus.stockhausen@gmx.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Markus Stockhausen 2026-08-31 16:34:37 +02:00 • committed by Jakub Kicinski

parent cc7a5bfaea

commit 6ab6cb66b3

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drivers/net/mdio/mdio-realtek-rtl9300.c

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