linux-kernel - Re: [RFC PATCH net-next 0/6] Add support for OPEN Alliance 10BASE-T1x MACPHY Serial Interface

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Message-ID: <79a32553-3926-e3b8-980d-351d94fc063b@microchip.com>
Date:   Mon, 18 Sep 2023 06:12:56 +0000
From:   <Parthiban.Veerasooran@...rochip.com>
To:     <ada@...rsis.com>, <alexandru.tachici@...log.com>, <andrew@...n.ch>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <corbet@....net>, <Steen.Hegelund@...rochip.com>,
        <rdunlap@...radead.org>, <horms@...nel.org>,
        <casper.casan@...il.com>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <Horatiu.Vultur@...rochip.com>,
        <Woojung.Huh@...rochip.com>, <Nicolas.Ferre@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, <Thorsten.Kummermehr@...rochip.com>
Subject: Re: [RFC PATCH net-next 0/6] Add support for OPEN Alliance 10BASE-T1x
 MACPHY Serial Interface

Hi Alexander,

Thanks for the information. Please see my reply below.

On 15/09/23 7:26 pm, Alexander Dahl wrote:
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> 
> Hello,
> 
> this is interesting, by chance I just looked at a chip claiming
> similar features today, which already has a driver in kernel: Analog
> Devices ADIN1110.
Microchip's LAN865x is a 10BASE-T1S MACPHY and Analog Devices's ADIN1110 
is a 10BASE-T1L MACPHY. So as you said 10BASE-T1x MAC_PHY Serial 
Interface Specification defined by OPEN Alliance TC6 group can be 
applicable for both of the devices. I also noticed that ADI's datasheet 
says ADIN1110 supports OPEN Alliance 10BASE-T1x MAC-PHY serial
interface.
https://www.analog.com/media/en/technical-documentation/data-sheets/adin1110.pdf

But in my first glance in their driver code, I don't see any code block 
which implements 10BASE-T1x MAC_PHY Serial Interface Specification 
defined by OPEN Alliance TC6 group. Or do I miss anything here?. My code 
reference is below FYR,
https://elixir.bootlin.com/linux/v6.6-rc2/source/drivers/net/ethernet/adi/adin1110.c

OPEN Alliance 10BASE-T1x MAC_PHY Serial Interface Specification cab be 
downloaded from the below link,
https://opensig.org/automotive-ethernet-specifications/

I think Alexandru Tachici from ADI would be able to give us more 
information on this direction.
> 
> Am Fri, Sep 08, 2023 at 07:59:13PM +0530 schrieb Parthiban Veerasooran:
>> This patch series contain the below updates,
>> - Adds support for OPEN Alliance 10BASE-T1x MACPHY Serial Interface in the
>>    net/ethernet/oa_tc6.c.
> 
> So this implements the "10BASE-T1x MAC-PHY Serial Interface
> Specification" which is Ethernet over SPI if I understand correctly?
> The above mentioned chip claims do use the same interface and the same
> standard.  How does its driver work then?  Do you add code for a thing
> already present in the kernel or does the other driver do something
> completely different and I just misunderstood?
As I mentioned above, in my first glance in their driver code, I don't 
see any code block which implements 10BASE-T1x MAC_PHY Serial Interface 
Specification defined by OPEN Alliance TC6 group. Let's Alexandru 
Tachici from ADI gives us more info on this.
> 
> Can the drivers for ADIN1110 and for LAN865X share code because they
> use the same specified interface?  The patch set does not look like
> it?
Of course, if their device supports OPEN Alliance then we can use this 
oa_tc6.c framework to support other 10BASE-T1x MACPHY's as well.
> 
> (Added the other driver author to Cc.)
Ok thanks.

Best Regards,
Parthiban V
> 
> Greets
> Alex
> 
>> - Adds driver support for Microchip LAN8650/1 Rev.B0 10BASE-T1S MACPHY
>>    Ethernet driver in the net/ethernet/microchip/lan865x.c.
>>
>> Parthiban Veerasooran (6):
>>    net: ethernet: implement OPEN Alliance control transaction interface
>>    net: ethernet: add mac-phy interrupt support with reset complete
>>      handling
>>    net: ethernet: implement OA TC6 configuration function
>>    net: ethernet: implement data transaction interface
>>    microchip: lan865x: add driver support for Microchip's LAN865X MACPHY
>>    microchip: lan865x: add device-tree support for Microchip's LAN865X
>>      MACPHY
>>
>>   .../bindings/net/microchip,lan865x.yaml       |  54 ++
>>   Documentation/networking/oa-tc6-framework.rst | 231 +++++
>>   MAINTAINERS                                   |  15 +
>>   drivers/net/ethernet/microchip/Kconfig        |  10 +
>>   drivers/net/ethernet/microchip/Makefile       |   3 +
>>   drivers/net/ethernet/microchip/lan865x.c      | 589 +++++++++++++
>>   drivers/net/ethernet/oa_tc6.c                 | 807 ++++++++++++++++++
>>   include/linux/oa_tc6.h                        | 130 +++
>>   8 files changed, 1839 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/net/microchip,lan865x.yaml
>>   create mode 100644 Documentation/networking/oa-tc6-framework.rst
>>   create mode 100644 drivers/net/ethernet/microchip/lan865x.c
>>   create mode 100644 drivers/net/ethernet/oa_tc6.c
>>   create mode 100644 include/linux/oa_tc6.h
>>
>> --
>> 2.34.1
>>
>>