linux-kernel - Re: [PATCH 1/2] dt-bindings: fpga: Convert bridge binding to yaml

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Date: Tue, 9 Jan 2024 14:31:21 +0100
From: Michal Simek <michal.simek@....com>
To: Xu Yilun <yilun.xu@...ux.intel.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: linux-kernel@...r.kernel.org, monstr@...str.eu, michal.simek@...inx.com,
 git@...inx.com, Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Moritz Fischer <mdf@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Tom Rix <trix@...hat.com>, Wu Hao <hao.wu@...el.com>,
 Xu Yilun <yilun.xu@...el.com>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>, kishore Manne <nava.kishore.manne@....com>,
 "open list:FPGA MANAGER FRAMEWORK" <linux-fpga@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: fpga: Convert bridge binding to yaml



On 1/9/24 11:22, Xu Yilun wrote:
> On Tue, Jan 09, 2024 at 09:16:33AM +0100, Krzysztof Kozlowski wrote:
>> On 09/01/2024 09:15, Krzysztof Kozlowski wrote:
>>>>>>>>> +properties:
>>>>>>>>> +  $nodename:
>>>>>>>>> +    pattern: "^fpga-bridge(@.*)?$"
>>>>>>>>
>>>>>>>> Not sure, but maybe we need to allow fpga-bridge-1? Could we have more
>>>>>>>> than one bridge on given system?
>>>>>>>
>>>>>>> Yilun: Any comment on this?
>>>>>>
>>>>>> We can have more bridges, but IIUC people use fpga-bridge@0, fpga-bridge@0
>>>>>> to identify them. So the expression is OK to me.
>>>>>
>>>>> So you claim unit address thus reg with some sort of bus address is a
>>>>> requirement? Then "?" is not correct in that pattern.
>>>>
>>>> I expect it is about that people are using fpga-bridge@0 but bridge is not on
>>>> the bus. Yilun said that reg property in altr,socfpga-fpga2sdram-bridge.yaml is
>>>> optional which means no reg property no @XXX in node name.
>>>> That's why I think that expression is correct. If there are more bridges without
>>>> reg property then I expect we need to get more examples to align expression.
>>>
>>> If we allow node name without unit address, thus not being part of any
> 
> This is valid usecase.
> 
>>> bus, then the only question is whether it is possible to have system
>>> with more than two FPGA bridges. If the answer is "yes", which I think
> 
> The answer is yes.
> 
>>> is the case, then the pattern should already allow it:
>>>
>>> (@[0-9a-f]+|-[0-9]+)?
>>
>> Or better go with what I used recently for narrowed choices:
>>
>> (@.*|-([0-9]|[1-9][0-9]+))?
> 
> It is good to me.
> 
> I actually didn't know much about DTS & its Schema, thanks for all your
> input.

Ok. Will send v3 with it.

Thanks,
Michal