RE: [PATCH net-next 1/5] dt-bindings: net: add onsemi's TS2500/NCN26010 10BASE-T1S MACPHY

[Selvamani Rajagopal]

> -----Original Message-----
> From: Andrew Lunn <andrew@xxxxxxx>
> Sent: Tuesday, May 5, 2026 10:28 AM
> To: Selvamani Rajagopal <Selvamani.Rajagopal@xxxxxxxxxx>
> Cc: Rob Herring <robh@xxxxxxxxxx>; Piergiorgio Beruto <Pier.Beruto@xxxxxxxxxx>;
> andrew+netdev@xxxxxxx; davem@xxxxxxxxxxxxx; edumazet@xxxxxxxxxx;
> kuba@xxxxxxxxxx; pabeni@xxxxxxxxxx; krzk+dt@xxxxxxxxxx; conor+dt@xxxxxxxxxx;
> netdev@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH net-next 1/5] dt-bindings: net: add onsemi's TS2500/NCN26010
> 10BASE-T1S MACPHY
> 
> 
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> 
> > Had the same question in internal review. Datasheet says the minimum
> > speed 15 MHz is needed. That's why we had placed.
> 
> Could you try it at lower speeds. What happens?
> 
> Since it is a 10Mbps media, if the SPI speed is lower than 15MHz,
> maybe it cannot keep up with the media? But this clock speed on its
> own is not the deciding factor, there could be other users of the SPI
> bus. I would expect the driver and device to keep working if the SPI
> bus is saturated, just not give the full 10Mbps. And it would also be
> a good test the device and driver do work correctly when the bus is
> saturated.


I should have given more information. If we configure SPI at lower speed, it may start losing frames as it can't sustain the PHY's speed. Please let me know If I should remove it. 

> 
> Andrew