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[194.187.74.233]) by smtp.googlemail.com with ESMTPSA id r3sm1268275lfc.169.2021.09.20.05.52.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Sep 2021 05:52:01 -0700 (PDT) To: Network Development , Florian Fainelli From: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= Subject: Race between "Generic PHY" and "bcm53xx" drivers after -EPROBE_DEFER Message-ID: <3639116e-9292-03ca-b9d9-d741118a4541@gmail.com> Date: Mon, 20 Sep 2021 14:52:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org I have problem using a switch b53 MDIO driver with an Ethernet bgmac driver. bgmac registers MDIO bus before registering Ethernet controller. That results in kernel probing switch (available as MDIO device) early which results in dsa_port_parse_of() returning -EPROBE_DEFER. It's OK so far but then in goes like this: [ 1.306884] bus: 'bcma': driver_probe_device: matched device bcma0:5 with driver bgmac_bcma [ 1.315427] bus: 'bcma': really_probe: probing driver bgmac_bcma with device bcma0:5 [ 1.323468] bgmac_bcma bcma0:5: Found PHY addr: 30 (NOREGS) [ 1.329722] libphy: bcma_mdio mii bus: probed [ 1.334468] bus: 'mdio_bus': driver_probe_device: matched device bcma_mdio-0-0:1e with driver bcm53xx [ 1.343877] bus: 'mdio_bus': really_probe: probing driver bcm53xx with device bcma_mdio-0-0:1e [ 1.353174] bcm53xx bcma_mdio-0-0:1e: found switch: BCM53125, rev 4 [ 1.359595] bcm53xx bcma_mdio-0-0:1e: failed to register switch: -517 [ 1.366212] mdio_bus bcma_mdio-0-0:1e: Driver bcm53xx requests probe deferral [ 1.373499] mdio_bus bcma_mdio-0-0:1e: Added to deferred list [ 1.379362] bgmac_bcma bcma0:5: Support for Roboswitch not implemented [ 1.387067] bgmac_bcma bcma0:5: Timeout waiting for reg 0x1E0 [ 1.393600] driver: 'Generic PHY': driver_bound: bound to device 'bcma_mdio-0-0:1e' [ 1.401390] Generic PHY bcma_mdio-0-0:1e: Removed from deferred list I can't drop "Generic PHY" driver as it's required for non-CPU switch ports. I just need kernel to prefer b53 MDIO driver over the "Generic PHY" one. Can someone help me fix that, please? -- Rafał