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Date:   Tue, 8 Aug 2023 15:22:49 +0300
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Subject: Re: [EXTERNAL] Re: [PATCH v2 0/5] Introduce IEP driver and packet
 timestamping support
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To:     Md Danish Anwar <a0501179@ti.com>, Conor Dooley <conor@kernel.org>,
        MD Danish Anwar <danishanwar@ti.com>
Cc:     Randy Dunlap <rdunlap@infradead.org>,
        Simon Horman <simon.horman@corigine.com>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Richard Cochran <richardcochran@gmail.com>,
        Conor Dooley <conor+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        "David S. Miller" <davem@davemloft.net>, nm@ti.com, srk@ti.com,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        netdev@vger.kernel.org, linux-omap@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
References: <20230807110048.2611456-1-danishanwar@ti.com>
 <20230808-unnerving-press-7b61f9c521dc@spud>
 <1c8e5369-648e-98cb-cb14-08d700a38283@ti.com>
From:   Roger Quadros <rogerq@kernel.org>
In-Reply-To: <1c8e5369-648e-98cb-cb14-08d700a38283@ti.com>
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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