[PATCH net-next v3 0/4] net: mdio: realtek-rtl9300: add bus frequency handling

The Realtek Otto switch platform consists of four different series

- RTL838x aka maple   : 28 port 1G Switches
- RTL839x aka cypress : 52 port 1G Switches
- RTL930x aka longan  : 28 port 1G/2.5G/10G Switches
- RTL931x aka mango   : 56 port 1G/2.5G/10G Switches

All of them support changing the bus frequency of their one to four
Ethernet MDIO buses, although the available settings differ between
the series. Extend the driver to support this feature.

Signed-off-by: Markus Stockhausen <redacted>
---
v2 -> v3:
  - Add Acked-by for devicetree patch. (Conor)
  - Andrews Reviewed-by not added because of Sashiko findings. (Markus)
  - Add patch "Reject duplicate MDIO bus" to harden the bus detection
    and as preparation for the RTL839x frequency setup. (Markus)
  - Rework RTL839x frequency setup to better handle missing/default
    frequencies. (Sashiko)
  - Use for_each_available_child_of_node_scoped(). (Sashiko)
v2: https://lore.kernel.org/netdev/20260906081946.3499898-1-markus.stockhausen@gmx.de/ (local)
v2 Sashiko 1: https://sashiko.dev/#/patchset/20260906081946.3499898-1-markus.stockhausen%40gmx.de
v2 Sashiko 2: https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260906081946.3499898-1-markus.stockhausen%40gmx.de


v1 -> v2:
  - Describe per-device frequencies in devicetree. (Andrew)
  - Add proper per-device frequency checks. (Andrew)
  - Use the initialized parent device for dev_warn(). (Sashiko)
  - Make clear that otto_emdio_probe_one() currently has an
    indentation issue that will be fixed by this series. (Andrew)
  - Throw error if RTL839x devicetree has different speeds set
    for first and second bus.

v1: https://lore.kernel.org/netdev/20260903122119.2638354-1-markus.stockhausen@gmx.de/ (local)
v1 Sashiko: https://sashiko.dev/#/patchset/20260903122119.2638354-1-markus.stockhausen%40gmx.de



Markus Stockhausen (4):
  dt-bindings: net: realtek,rtl9301-mdio: Add clock-frequency
  net: mdio: realtek-rtl9300: Convert "fwnode" left-overs to "of"
  net: mdio: realtek-rtl9300: Reject duplicate MDIO bus IDs
  net: mdio: realtek-rtl9300: Support non-default clock frequency

 .../bindings/net/realtek,rtl9301-mdio.yaml    |  40 +++++++
 drivers/net/mdio/mdio-realtek-rtl9300.c       | 110 +++++++++++++++++-
 2 files changed, 145 insertions(+), 5 deletions(-)

-- 
2.55.0