netdev - Re: [EXTERNAL] Re: [PATCH v2 0/5] Introduce IEP driver and packet timestamping support

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Date: Tue, 8 Aug 2023 15:22:49 +0300
From: Roger Quadros <rogerq@...nel.org>
To: Md Danish Anwar <a0501179@...com>, Conor Dooley <conor@...nel.org>,
 MD Danish Anwar <danishanwar@...com>
Cc: Randy Dunlap <rdunlap@...radead.org>,
 Simon Horman <simon.horman@...igine.com>,
 Vignesh Raghavendra <vigneshr@...com>, Andrew Lunn <andrew@...n.ch>,
 Richard Cochran <richardcochran@...il.com>,
 Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Rob Herring <robh+dt@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 "David S. Miller" <davem@...emloft.net>, nm@...com, srk@...com,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 netdev@...r.kernel.org, linux-omap@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [EXTERNAL] Re: [PATCH v2 0/5] Introduce IEP driver and packet
 timestamping support

On 08/08/2023 15:18, Md Danish Anwar wrote:
> On 08/08/23 5:38 pm, Conor Dooley wrote:
>> On Mon, Aug 07, 2023 at 04:30:43PM +0530, MD Danish Anwar wrote:
>>> This series introduces Industrial Ethernet Peripheral (IEP) driver to
>>> support timestamping of ethernet packets and thus support PTP and PPS
>>> for PRU ICSSG ethernet ports.
>>>
>>> This series also adds 10M full duplex support for ICSSG ethernet driver.
>>>
>>> There are two IEP instances. IEP0 is used for packet timestamping while IEP1
>>> is used for 10M full duplex support.
>>>
>>> This is v2 of the series [v1]. It addresses comments made on [v1].
>>> This series is based on linux-next(#next-20230807). 
>>>
>>> Changes from v1 to v2:
>>> *) Addressed Simon's comment to fix reverse xmas tree declaration. Some APIs
>>>    in patch 3 and 4 were not following reverse xmas tree variable declaration.
>>>    Fixed it in this version.
>>> *) Addressed Conor's comments and removed unsupported SoCs from compatible
>>>    comment in patch 1. 
>>
>> I'm sorry I missed responding there before you sent v2, it was a bank
>> holiday yesterday. I'm curious why you removed them, rather than just
>> added them with a fallback to the ti,am654-icss-iep compatible, given
>> your comment that "the same compatible currently works for all these
>> 3 SoCs".
> 
> I removed them as currently the driver is being upstreamed only for AM654x,
> once I start up-streaming the ICSSG driver for AM64 and any other SoC. I will
> add them here. If at that time we are still using same compatible, then I will
> modify the comment otherwise add new compatible.
> 
> As of now, I don't see the need of adding other SoCs in iep binding as IEP
> driver up-streaming is only planned for AM654x as of now.

But, is there any difference in IEP hardware/driver for the other SoCs?
AFAIK the same IP is used on all SoCs.

If there is no hardware/code change then we don't need to introduce a new compatible.
The comment for all SoCs can already be there right from the start.

-- 
cheers,
-roger