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b=Wz+5ULjyplZLbI1hHprqW1CtSLk3GQkbxiAFr0SDhEx+u8GuYI5u3z9YQ8fcKo198c3zsDX+8dg+iyLOZ0ij4Zoa6gsbB+JYjwb3CERcD6AWm0eDLAmBakI3gt8esHxbzkb5EqCa3kMOxwANCy/t/xodAAYpQmySlrP+XN+O3zg= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from CYXPR12MB9337.namprd12.prod.outlook.com (2603:10b6:930:d8::20) by SA3PR12MB7829.namprd12.prod.outlook.com (2603:10b6:806:316::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7159.23; Tue, 9 Jan 2024 08:20:51 +0000 Received: from CYXPR12MB9337.namprd12.prod.outlook.com ([fe80::2b19:2045:59c7:cde2]) by CYXPR12MB9337.namprd12.prod.outlook.com ([fe80::2b19:2045:59c7:cde2%7]) with mapi id 15.20.7159.020; Tue, 9 Jan 2024 08:20:51 +0000 Message-ID: Date: Tue, 9 Jan 2024 09:20:35 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] dt-bindings: fpga: Convert bridge binding to yaml Content-Language: en-US To: Krzysztof Kozlowski , Xu Yilun Cc: linux-kernel@vger.kernel.org, monstr@monstr.eu, michal.simek@xilinx.com, git@xilinx.com, Conor Dooley , Krzysztof Kozlowski , Moritz Fischer , Rob Herring , Tom Rix , Wu Hao , Xu Yilun , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , kishore Manne , "open list:FPGA MANAGER FRAMEWORK" References: <3100bbc4723643ec1ec7d4548e9ab353c856b564.1704470663.git.michal.simek@amd.com> <4bcac34b-72a0-464e-91cd-d9e924073619@amd.com> <3bfaab38-6831-41f8-8a7b-9f1f434e0f9c@amd.com> From: Michal Simek Autocrypt: addr=michal.simek@amd.com; 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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]+)? Let's see what Yilun says. I am happy to align it. IIRC in our case bridge doesn't need to have reg interface because it can be handled via gpio. You can have multiple of them but doesn't make sense to allocate multiple gpios to handle it because they can connected in a chain that one gpio drives all of them (And I don't think we have ever been requested to write a driver for it). Thanks, Michal