netdev - RFC: Adding Microchip's LAN865x 10BASE-T1S MAC-PHY driver support to Linux

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Message-ID: <076fbcec-27e9-7dc2-14cb-4b0a9331b889@microchip.com>
Date:   Fri, 10 Mar 2023 11:13:23 +0000
From:   <Parthiban.Veerasooran@...rochip.com>
To:     <netdev@...r.kernel.org>
CC:     <Jan.Huber@...rochip.com>, <Thorsten.Kummermehr@...rochip.com>
Subject: RFC: Adding Microchip's LAN865x 10BASE-T1S MAC-PHY driver support to
 Linux

Hi All,

I would like to add Microchip's LAN865x 10BASE-T1S MAC-PHY driver 
support to Linux kernel.
(Product link: https://www.microchip.com/en-us/product/LAN8650)

The LAN8650 combines a Media Access Controller (MAC) and an Ethernet PHY 
to access 10BASE‑T1S networks. The common standard Serial Peripheral 
Interface (SPI) is used so that the transfer of Ethernet packets and 
LAN8650 control/status commands are performed over a single, serial 
interface.

Ethernet packets are segmented and transferred over the serial interface
according to the OPEN Alliance 10BASE‑T1x MAC‑PHY Serial Interface 
specification designed by TC6.
(link: https://www.opensig.org/Automotive-Ethernet-Specifications/)
The serial interface protocol can simultaneously transfer both transmit 
and receive packets between the host and the LAN8650.

Basically the driver comprises of two parts. One part is to interface 
with networking subsystem and SPI subsystem. The other part is a TC6 
state machine which implements the Ethernet packets segmentation 
according to OPEN Alliance 10BASE‑T1x MAC‑PHY Serial Interface 
specification.

The idea behind the TC6 state machine implementation is to make it as a 
generic library and platform independent. A set of API's provided by 
this TC6 state machine library can be used by the 10BASE-T1x MAC-PHY 
drivers to segment the Ethernet packets according to the OPEN Alliance 
10BASE‑T1x MAC‑PHY Serial Interface specification.

With the above information, kindly provide your valuable feedback on my 
below queries.

Can we keep this TC6 state machine within the LAN865x driver or as a 
separate generic library accessible for other 10BASE-T1x MAC-PHY drivers 
as well?

If you recommend to have that as a separate generic library then could 
you please advice on what is the best way to do that in kernel?

I am very interested to hear your opinion on this topic. Please let me 
know in case you need more information on this.

Best Regards,
Parthiban V