Re: user space interface for configuring T1 PHY management mode (master/slave)

[Marek Vasut]

On 3/25/20 9:34 AM, Oleksij Rempel wrote:
> Hi all,

Hi,

> I'm working on mainlining of NXP1102 PHY (BroadR Reach/802.3bw) support.
> 
> Basic functionality is working and support with mainline kernel. Now it is time
> to extend it. According to the specification, each PHY can be master or slave.
> 
> The HW can be pre configured via bootstrap pins or fuses to have a default
> configuration. But in some cases we still need to be able to configure the PHY
> in a different mode: 
> --------------------------------------------------------------------------------
> http://www.ieee802.org/3/1TPCESG/public/BroadR_Reach_Automotive_Spec_V3.0.pdf
> 
> 6.1 MASTER-SLAVE configuration resolution
> 
> All BroadR-Reach PHYs will default to configure as SLAVE upon power up or reset
> until a management system (for example, processor/microcontroller) configures
> it to be MASTER. MASTER-SLAVE assignment for each link configuration is
> necessary for establishing the timing control of each PHY.

Thanks for reminding me of this. I sent out
https://patchwork.ozlabs.org/project/netdev/list/?series=166575
maybe it helps.