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

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Date:   Mon, 9 Oct 2017 07:42:55 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     Moritz Fischer <mdf@...nel.org>,
        Michal Simek <michal.simek@...inx.com>
CC:     Philip Balister <philip@...ister.org>,
        <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 6.10.2017 18:18, Moritz Fischer wrote:
> On Fri, Oct 06, 2017 at 01:49:44PM +0200, 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.
> 
> Yeah, it's on Thursday, right?

Yep Thursday but no exact time yet.

M