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

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Message-ID: <f6858856-53c4-5eb8-ab52-350aab280735@microchip.com>
Date:   Mon, 18 Sep 2023 09:02:47 +0000
From:   <Parthiban.Veerasooran@...rochip.com>
To:     <lennart@...omain.com>, <ada@...rsis.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: Fwd: [RFC PATCH net-next 0/6] Add support for OPEN Alliance
 10BASE-T1x MACPHY Serial Interface

Hi Lennart,

I am forwarding this email to you as we are not able to reach the module 
author Alexandru Tachici <alexandru.tachici@...log.com> and getting the 
below email delivery error.

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alexandru.tachici@...log.com<mailto:alexandru.tachici@...log.com>
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We got your your email address from the commit 
bc93e19d088bb14e116756ab270deea6ee62d782. Regarding the below topic, are 
you the right contact parson to continue further on this topic or else 
do you have any other contact to approach? Please let us know.

Best Regards,
Parthiban V
-------- Forwarded Message --------
Subject: Re: [RFC PATCH net-next 0/6] Add support for OPEN Alliance 
10BASE-T1x MACPHY Serial Interface
Date: Mon, 18 Sep 2023 11:42:33 +0530
From: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
To: ada@...rsis.com, Alexandru Tachici <alexandru.tachici@...log.com>, 
Andrew Lunn <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

Hi Alexander,

Thanks for the information. Please see my reply below.

On 15/09/23 7:26 pm, Alexander Dahl wrote:
> [Some people who received this message don't often get email from ada@...rsis.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
> 
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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
>>
>>