Re: [PATCH net-next 1/3] dt-bindings: net: dp83822: support configuring RMII master/slave mode

[Andrew Lunn]

> > We are normally interested in this 50Mhz reference clock. So i would
> > drop all references to 25Mhz. It is not relevant to the binding, since
> > it is nothing to do with connecting the PHY to the MAC, and it has a
> > fixed value.
> > 
> > So you can simplify this down to:
> > 
> > RMII Master: Outputs a 50Mhz Reference clock which can be connected to the MAC.
> > 
> > RMII Slave: Expects a 50MHz Reference clock input, shared with the
> > MAC.
> > 
> > > That said, would you like me to include this description (or some parts) in
> > > the binding in addition to what I've already written? Or would you prefer me
> > > to use a more meaningful property name?
> > 
> > We don't really have any vendor agnostic consistent naming. dp83867
> > and dp83869 seems to call this ti,clk-output-sel. Since this is
> > another dp83xxx device, it would be nice if there was consistency
> > between all these TI devices. So could you check if the concept is the
> > same, and if so, change dp83826 to follow what other TI devices do.
> 
> 
> So I had a look at this ti,clk-output-sel property on the TI DP8386x
> bindings, but unfortunately it does not correspond to our use case. In their
> case, it is used to select one of the various internal clocks to output on
> the CLK_OUT pin.
> In our case, we would prefer to describe the direction of the clock (OUT in
> master mode, IN in slave mode).

I would suggest we keep with the current property name, but simplify
the description. Focus on the reference clock, and ignore the crystal.

    Andrew