{"id":2230769,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230769/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260430024945.3413973-2-wei.fang@nxp.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.1/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/"},"msgid":"<20260430024945.3413973-2-wei.fang@nxp.com>","date":"2026-04-30T02:49:31","name":"[v5,net-next,01/15] dt-bindings: net: dsa: update the description of 'dsa,member' 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<wei.fang@nxp.com>","To":"claudiu.manoil@nxp.com,\n\tvladimir.oltean@nxp.com,\n\txiaoning.wang@nxp.com,\n\tandrew+netdev@lunn.ch,\n\tdavem@davemloft.net,\n\tedumazet@google.com,\n\tkuba@kernel.org,\n\tpabeni@redhat.com,\n\trobh@kernel.org,\n\tkrzk+dt@kernel.org,\n\tconor+dt@kernel.org,\n\tf.fainelli@gmail.com,\n\tfrank.li@nxp.com,\n\tchleroy@kernel.org,\n\thorms@kernel.org,\n\tlinux@armlinux.org.uk","Cc":"netdev@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tdevicetree@vger.kernel.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-arm-kernel@lists.infradead.org,\n\timx@lists.linux.dev","Subject":"[PATCH v5 net-next 01/15] dt-bindings: net: dsa: update the\n description of 'dsa,member' property","Date":"Thu, 30 Apr 2026 10:49:31 +0800","Message-Id":"<20260430024945.3413973-2-wei.fang@nxp.com>","X-Mailer":"git-send-email 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trhzImNGPHuy+OzbLtXGctgGWlz5eGtFIkWZHVKxuw2wf4Uwr1vSOG9Pjc5JhiomogGt5FXeSEyI78eeMrSjxGP7jgHJMdAQPtSeYU4THs4YepioeW4CevcZCjj9xwRKzBi+yJo2SS886ruZdn/4C8ShTxDmuPTaYLVbTu91orCZUv4LyPz7qTZqjbd9o5T/ERhKposoICiGqPm57TL46vKnWYLLlriCbIMF5exTcPaFTbZkhTCHBHE3uOqT7JOqsXeqSC7CH/30UNFSN8cKfzu41qNrKjnrjKb0LswNITivH85J5XkuN+iKapp0bBXDiisqCvgLUz8idB0u5OlkpS8IpDji8K5WfqfvaizK8OZMW//IvYGOXAaEEBngODJ+voZ3NAHR9G2rmBTlNxo91TwxJb+K6N9hZPzZf4AVzYcQ9nQVE+LEz8M7aYha0AgK+XFxRzKVFsmZXKuFy42xe8SkG5NhisOZmg7nvwb2UhM/CSGBTjp3lkWoAHjW6VFJspUbw6ZtDNH6x+Nd+4ZxG7+f9VqqsBB1Xa7B48IpvbGndb79PlJLbeChK4YFCrjlGiXbTel97b58xiw1+h7aGRefpLOk7N4SVy9ve885Lt8AHwv+4ZIA37P+q2srPLGLx2+gqLVZ1mQ0TR1i6Ve9GXnHYJSL/+Jaj3Efs6+CmId17N50Kqtn3xXC21fcordJ74qvMhfvWYS/YNjVYHHlwwO8KNa9V1iPbUbIHnN90KBcsocw/jQwtgbugY5XoSbGsq5LPRijH1hd52gY7mTozhbtfj1ATmKjn5adVs6xS79g02OQuZDtNnCCZeH4ToMkEN0/6hiU1TqOceXZh9DcB7Zfgz0JgJ4O3x2QMuTeATtvr62lpK4s01KW521hT5vUkC+t40ID7aJ+oEj5Ukxo4DTvvA9WasdQskAmg3+gf61GIAdBt7b5xWN6hLxVPpbsplXGwqL2y9AwI/aIgPK65PtbkBbCJhoQizdasL+8HJ6UPnLly5colE+mZU80h9ipWnaPrN77s6wem9VNwQ1suTE0aKLwoDZ7x+BbXUxoM2aZGlIWqCMz1LnRx7FG8KoSipXPtAvGCB8V9lNDQ5/ChWY1P67YDHILLbwaxFFKWF02w0Dn2kaDo99vRpx86UoMjyx1xuzesWZOtEAlp1c/LDhhXwBh5YsFOE9z9SHIduekLYGF2nBdLd0NxgbvDJhyQtQCPlCCFydPUiuTO3ZkONvVvg9sRAMc78+vi67jRSpZny0ki3OLCQGl4ezgeaG3JWXfun8A4wTxBAM8YQS5OycmIvb5ON4w6FLGQbSJJaTWVExmQQS5whiLqW9w4VJ7XtS7XRiwNXcqrPmPpZTz8Ieftqmtz4oDRTin1tc/OxnFYw7VfN3AdxwlJa5YVlT/feGSOngyKJn610T4LA/TUuDvwLRkB8FE0EsvE/wiyC/sKMhMSHM/btkk5sA0cm2EUM5IFFeUeEgzLH6ruvFtc5isVNXDVOwtRJGOl/UBQ1VSrSJZg6VUcz+qVXzhky02471ThYL9btn1BNFH49iXC9NMLCdS1pSB7dSPH0W9GSQw92YcsfwyibDfV11DT+ZubSKeIbz4HrgocLD+WCOGaVsBZlV3gVqG5yd10NcJaidJVtb09SviAQKuzEB+HGzgE3KZc0BpFBUmikUxSJDm1wGiogW2OrQTsiubJnVTiK41YzQ1HyygnhWJD1n9H91iZ1xnGnjAnqHgjCLh2YGFTQ==","X-OriginatorOrg":"nxp.com","X-MS-Exchange-CrossTenant-Network-Message-Id":"\n a5f180e9-b509-4c03-3b14-08dea662d20d","X-MS-Exchange-CrossTenant-AuthSource":"DBBPR04MB7500.eurprd04.prod.outlook.com","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"30 Apr 2026 02:47:29.7381\n (UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"686ea1d3-bc2b-4c6f-a92c-d99c5c301635","X-MS-Exchange-CrossTenant-MailboxType":"HOSTED","X-MS-Exchange-CrossTenant-UserPrincipalName":"\n 9Vv1BEu6LxHBE1xroSWfBsiq9ClSKy1xgjSRPb4HYx2SGzIsiuv/ZiE0phZfjtrQl5Z3yVGBv1cikq1JlKvFLQ==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"PAXPR04MB8608","X-Spam-Status":"No, score=0.8 required=3.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,\n\tSPF_HELO_PASS,T_SPF_PERMERROR autolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"},"content":"The current description indicates that the 'dsa,member' property cannot\nbe set for a switch that is not part of any cluster. Vladimir thinks\nthat this is a case where the actual technical limitation was poorly\ntransposed into words when this restriction was first documented, in\ncommit 8c5ad1d6179d (\"net: dsa: Document new binding\").\n\nThe true technical limitation is that many DSA tagging protocols are\ntopology-unaware, and always call dsa_conduit_find_user() with a\nswitch_id of 0. Specifying a custom \"dsa,member\" property with a\nnon-zero switch_id would break them.\n\nTherefore, for topology-aware switches, it is fine to specify this\nproperty for them, even if they are not part of any cluster. Our NETC\nswitch is a good example which is topology-aware, the switch_id is\ncarried in the switch tag, but the switch_id 0 is reserved for VEPA\nswitch and cannot be used, so we need to use this property to assign\na non-zero switch_id for it.\n\nSuggested-by: Vladimir Oltean <vladimir.oltean@nxp.com>\nSigned-off-by: Wei Fang <wei.fang@nxp.com>\nAcked-by: Rob Herring (Arm) <robh@kernel.org>\n---\n Documentation/devicetree/bindings/net/dsa/dsa.yaml | 6 +++++-\n 1 file changed, 5 insertions(+), 1 deletion(-)","diff":"diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.yaml b/Documentation/devicetree/bindings/net/dsa/dsa.yaml\nindex 2abd036578d1..801e1411e5c2 100644\n--- a/Documentation/devicetree/bindings/net/dsa/dsa.yaml\n+++ b/Documentation/devicetree/bindings/net/dsa/dsa.yaml\n@@ -28,7 +28,11 @@ properties:\n       A two element list indicates which DSA cluster, and position within the\n       cluster a switch takes. <0 0> is cluster 0, switch 0. <0 1> is cluster 0,\n       switch 1. <1 0> is cluster 1, switch 0. A switch not part of any cluster\n-      (single device hanging off a CPU port) must not specify this property\n+      (single device hanging off a CPU port) does not usually need to specify\n+      this property, and then it becomes cluster 0, switch 0. For a topology\n+      aware switch, its switch index can be specified through this property,\n+      even if it is not part of any cluster. Also, topology-unaware switches\n+      must always be defined as index 0 of their cluster.\n     $ref: /schemas/types.yaml#/definitions/uint32-array\n \n additionalProperties: true\n","prefixes":["v5","net-next","01/15"]}