net: mdio: realtek-rtl9300: Open up C22 and C45 space in parallel

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Until now the MDIO driver supports either access to the C22 or to
the C45 address space of the PHYs. This is due to the fact that
the polling configuration favours one of the address spaces and
limits access to the other space. E.g. when polling is set to
C22 most of the C45 space can not be accessed.

There are however some exceptions from that. EEE register access
is allowed independently from the polling mode [1]. As the
downstream driver already allows parallel C22/C45 access [2] do
this in upstream too.

[1] https://github.com/openwrt/openwrt/blob/main/target/linux/realtek/files-6.18/drivers/net/phy/realtek/realtek_multiport.c#L349
[2] https://github.com/openwrt/openwrt/blob/main/target/linux/realtek/files-6.18/drivers/net/mdio/mdio-realtek-otto.c#L1072

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260831143439.2404484-11-markus.stockhausen@gmx.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Markus Stockhausen 2026-08-31 16:34:36 +02:00 • committed by Jakub Kicinski

parent 6be4be074b

commit cc7a5bfaea

1 changed files with 4 additions and 7 deletions

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

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