net: mdio: realtek-rtl9300: relocate topology setup

Until now the driver sets up the port to bus/address topology of the
controller after all buses are set up via otto_emdio_probe_one(). This
does not work for devices where U-Boot skips this setup. It is not
only needed for the hardware internal background PHY polling engine
but it is essential for access to the PHYs during probing.

Depending on the SoC type there exist two different register arrays

- Bus mapping registers (RTL930x, RTL931x) define to which bus the port
  is attached. E.g. [1]
- Address mapping registers (RTL838x, RTL930x, RTL931x) define to which
  address of the bus the port is attached. E.g. [2]

Relocate the topology setup and make it generic. For this

- Define device-specific bus_base/addr_base attributes that give the
  register base address where the mapping lives. In case one or both are
  not given the SoC does not support this specific type of mapping.
- Create a helper otto_emdio_setup_topology() that writes the detected
  topology to the registers.
- Call this helper prior to otto_emdio_probe_one().
- Remove unneeded code from otto_emdio_9300_mdiobus_init().
- Due to the added prefixes, increase define indentation

Subtle change: The old coding used regmap_bulk_write and silently wrote
bus=0/address=0 to mapping registers for ports that are out of scope.
The new coding leaves those untouched.

[1] https://svanheule.net/realtek/longan/register/smi_port0_15_polling_sel
[2] https://svanheule.net/realtek/longan/register/smi_port0_5_addr_ctrl

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://patch.msgid.link/20260603175924.123019-5-markus.stockhausen@gmx.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions