linux-kernel - Re: [PATCH 1/2] arm: dts: Add support for National Instruments Project Sulfur SDRs

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Message-ID: <2ecee25d-bac5-d818-00bc-5361a21c9ac5@balister.org>
Date:   Fri, 6 Oct 2017 07:58:40 -0700
From:   Philip Balister <philip@...ister.org>
To:     Michal Simek <michal.simek@...inx.com>,
        Moritz Fischer <mdf@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        robh+dt@...nel.org, mark.rutland@....com, linux@...linux.org.uk,
        gregkh@...uxfoundation.org, davem@...emloft.net,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/2] arm: dts: Add support for National Instruments
 Project Sulfur SDRs

On 10/06/2017 04:49 AM, Michal Simek wrote:
> On 26.9.2017 20:15, Philip Balister wrote:
>> On 09/26/2017 02:06 PM, Michal Simek wrote:
>>> On 26.9.2017 19:58, Philip Balister wrote:
>>>> On 09/26/2017 01:50 PM, Moritz Fischer wrote:
>>>>> Michal,
>>>>>
>>>>> On Tue, Sep 26, 2017 at 02:54:48PM +0200, Michal Simek wrote:
>>>>>> Hi,
>>>>>>
>>>>>> On 25.9.2017 18:11, Moritz Fischer wrote:
>>>>>>> Hi Michal,
>>>>>>>
>>>>>>> On Mon, Sep 25, 2017 at 10:19:44AM +0200, Michal Simek wrote:
>>>>>>>> Hi Moritz
>>>>>>>>
>>>>>>>> sorry for delay.
>>>>>>>
>>>>>>> No problem.
>>>>>>>
>>>>>>>>
>>>>>>>> On 12.9.2017 01:22, Moritz Fischer wrote:
>>>>>>>>> Add support for the National Instruments Project Sulfur SDR
>>>>>>>>> motherboards Rev 2,3 and 4.
>>>>>>>>>
>>>>>>>>> Signed-off-by: Moritz Fischer <mdf@...nel.org>
>>>>>>>>> ---
>>>>>>>>>  arch/arm/boot/dts/Makefile                |   3 +
>>>>>>>>>  arch/arm/boot/dts/zynq-ni-sulfur-rev2.dts |  84 +++++++++++++++++++
>>>>>>>>>  arch/arm/boot/dts/zynq-ni-sulfur-rev3.dts | 118 ++++++++++++++++++++++++++
>>>>>>>>>  arch/arm/boot/dts/zynq-ni-sulfur-rev4.dts |  26 ++++++
>>>>>>>>>  arch/arm/boot/dts/zynq-ni-sulfur.dtsi     | 133 ++++++++++++++++++++++++++++++
>>>>>>>>>  5 files changed, 364 insertions(+)
>>>>>>>>>  create mode 100644 arch/arm/boot/dts/zynq-ni-sulfur-rev2.dts
>>>>>>>>>  create mode 100644 arch/arm/boot/dts/zynq-ni-sulfur-rev3.dts
>>>>>>>>>  create mode 100644 arch/arm/boot/dts/zynq-ni-sulfur-rev4.dts
>>>>>>>>>  create mode 100644 arch/arm/boot/dts/zynq-ni-sulfur.dtsi
>>>>>>>>
>>>>>>>> Is this publicly available board?
>>>>>>>
>>>>>>> Will be in Q1 2018 was announced at GRCon'17 ([1]).
>>>>>>> Some of the Rev3s are currently deployed in Norway as part of a radar
>>>>>>> system.
>>>>>>>
>>>>>>>> I am not quite sure we should apply these dts files. There are a lot of
>>>>>>>> boards with zynq and there must be any strong argument for applying this
>>>>>>>> to the tree. For arm32 with even flat tree structure.
>>>>>>>
>>>>>>> What's the issue with merging them, except for having 3 more files? 
>>>>>>
>>>>>> For me this is not a problem because on Linux side it is not increasing
>>>>>> build time.
>>>>>> I want to see the value for community. All xilinx platforms are
>>>>>> evaluation generic purpose boards which are showing how to connect stuff
>>>>>> together.
>>>>>> On the other hand this is real product.
>>>>>
>>>>> Uh.
>>>>>
>>>>>> I would let arm-soc maintainer to decide if this is fine or not. I
>>>>>> definitely don't want to end up in situation that we will have dts for
>>>>>> real products which are not bringing any value for others.
>>>>>
>>>>> Sure, it's the maintainers call.
>>>>>
>>>>> I do intend to have my customers run mainline on it eventually, currently
>>>>> I'm a handful of patches away from making that happen. So yes, running
>>>>> mainline is a usecase that matters to me.
>>>>>
>>>>> It is one thing to keep bitching about vendor kernels as a community
>>>>> continuously, but then if someone goes through the effort and actually
>>>>> tries to run mainline, you give them crap like that above.
>>>>>
>>>>> Our products usually come with full schematics [1], firmware, fpga code and all
>>>>> available, I don't know what makes them less useful to the community as a
>>>>> platform to experiment and develop on than Xilinx eval boards.
>>>>>
>>>>> There's several people that I know of both hobbyists and companies that
>>>>> build systems around these platforms, so I don't know ...
>>>>
>>>> I expect this product to be delivered with full source and a mainline
>>>> kernel, so lets make it easy for Moritz to do the right thing here. This
>>>> makes long term support of this product much easier.
>>>>
>>>> Acked-by: Philip Balister <philip@...nsdr.com>
>>>
>>> I think this is the right way to go. Get ACK from Arnd or Olof or Kevin
>>> and I will merge this.
>>> I am simply just afraid that if a lot of zynq customers will ask for it
>>> we can will end up with a lot of zynq/zynqmp based dts files in the
>>> kernel and arm-soc guys will stop this that it is simply too much and
>>> won't accept +1 case.
>>
>> I share the same concerns. Unfortunately, there doesn't seem like any
>> other structured way to manage dts files.
>>
>> As an OpenEmbedded guy, I know I can carry them with BSP's, but not
>> everyone uses OpenEmbedded. I'd love to see a long term scalable
>> solution for tracking dts files, but that is outside the scope of
>> Moritz's request.
> 
> Are you guys coming to ELCE? There will be Devicetree Workshop which
> will be good place to talk about this.

Yes. When is the workshop?

Philip

> 
> Thanks,
> Michal
>