Hi Andrew,
On 14/12/2024 00:58, Andrew Lunn wrote:
On Fri, Dec 13, 2024 at 01:56:52PM +1300, Chris Packham wrote:
Hi Andrew,
On 13/12/2024 06:13, Andrew Lunn wrote:
+ realtek,smi-address:
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ description: SMI interface and address for the connected PHY
+ items:
+ - description: SMI interface number associated with the port.
+ - description: SMI address of the PHY for the port.
Is the hardware really random here with its mapping of PHYs?
Generally, hardware is pretty predictable, logical. I'm just wondering
if this property is really required, or if it can be replaced with
some logic, avoiding typ0s.
The hardware is pretty flexible in this respect. You can pretty arbitrarily
arrange your PHYs. Not all ports support the same kind of SERDES interface
but as far as the MDIO interface goes you can arrange things however you
like.
Is there a reason to not just statically define it, maybe with a table
in the driver? Does a DT developer actually need this flexibility?
It's a part of the board design so I think it's something that should go
into the device tree. For example I've got 3 different boards right now
that use different arrangements of MDIO connections to the PHYs mostly
for ease of board layout (and one because it has different PHYs).
