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Message-ID: <f3aeff02-2560-46e7-a712-1f8d323f43a4@linaro.org>
Date: Tue, 9 Jan 2024 09:16:33 +0100
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Subject: Re: [PATCH 1/2] dt-bindings: fpga: Convert bridge binding to yaml
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
To: Michal Simek <michal.simek@amd.com>, Xu Yilun <yilun.xu@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, monstr@monstr.eu, michal.simek@xilinx.com,
 git@xilinx.com, Conor Dooley <conor+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Moritz Fischer <mdf@kernel.org>, Rob Herring <robh+dt@kernel.org>,
 Tom Rix <trix@redhat.com>, Wu Hao <hao.wu@intel.com>,
 Xu Yilun <yilun.xu@intel.com>,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@vger.kernel.org>, kishore Manne <nava.kishore.manne@amd.com>,
 "open list:FPGA MANAGER FRAMEWORK" <linux-fpga@vger.kernel.org>
References: <3100bbc4723643ec1ec7d4548e9ab353c856b564.1704470663.git.michal.simek@amd.com>
 <ab6a9a0e-ab03-4d35-9e43-c90c22dbcb1d@linaro.org>
 <4bcac34b-72a0-464e-91cd-d9e924073619@amd.com>
 <ZZzDHxnMPTuraS4D@yilunxu-OptiPlex-7050>
 <bd356c60-7681-47e4-b45f-d25e70068b65@linaro.org>
 <3bfaab38-6831-41f8-8a7b-9f1f434e0f9c@amd.com>
 <e88205a2-f8b6-42c7-82cc-bfc08a680f3d@linaro.org>
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In-Reply-To: <e88205a2-f8b6-42c7-82cc-bfc08a680f3d@linaro.org>
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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
> 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
> 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]+))?

Best regards,
Krzysztof