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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Chevallier Cc: Artem Shimko , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH net-next v3 0/2] Add DAPU Telecom DAP8211R(I) Gigabit Ethernet PHY driver Date: Thu, 16 Jul 2026 20:33:23 +0300 Message-ID: <20260716173325.653164-1-a.shimko.dev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hello, This series adds support for the DAPU Telecom DAP8211R(I) Gigabit Ethernet PHY, commonly used in enterprise and industrial networking applications. The PHY supports 10/100/1000 Mbps operation with RGMII interface and includes features such as IEEE 802.3az Energy Efficient Ethernet, IEEE 1588 SyncE, and an internal packet generator for diagnostics. The driver implements extended register access via indirect addressing (registers 0x1E/0x1F) and provides comprehensive device tree support for RGMII delay configuration. The rx-internal-delay-ps and tx-internal-delay-ps properties allow precise tuning of clock delays in 150 ps steps from 0 to 2250 ps. The optional dapu,tx-inverted-clk flag enables 180-degree TX clock phase shift for boards where signal integrity or MAC requirements necessitate clock inversion. This PHY is used on the NDA platform with 1G Ethernet tile and has been tested on that hardware with successful link establishment and RGMII delay tuning. Due to the specific PCB layout of the platform and FPGA configuration, the default RGMII timing configuration was insufficient, causing packet loss during normal operation. Tuning the TX/RX line delays and enabling clock inversion restored proper signal timing, resulting in zero packet loss and stable link performance. $ make dt_binding_check DT_SCHEMA_FILES=dapu,dap8211r.yaml SCHEMA Documentation/devicetree/bindings/processed-schema.json CHKDT ./Documentation/devicetree/bindings LINT ./Documentation/devicetree/bindings STYLE ./Documentation/devicetree/bindings DTEX Documentation/devicetree/bindings/net/dapu,dap8211r.example.dts DTC [C] Documentation/devicetree/bindings/net/dapu,dap8211r.example.dtb grep -i "dap8211r" Documentation/devicetree/bindings/processed-schema.json chema.json "http://devicetree.org/schemas/net/dapu,dap8211r.yaml": { "$filename": ".../devicetree/bindings/net/dapu,dap8211r.yaml", "$id": "http://devicetree.org/schemas/net/dapu,dap8211r.yaml#", "title": "DAPU Telecom DAP8211R(I) Gigabit Ethernet PHY", Working with xgmac. Board side: $ arping -I eth0 192.168.5.100 ARPING 192.168.5.1 from 192.168.5.100 eth0 Unicast reply from 192.168.5.1 [board.mac.addr] 8.543ms Unicast reply from 192.168.5.1 [board.mac.addr] 3.295ms Unicast reply from 192.168.5.1 [board.mac.addr] 4.301ms Unicast reply from 192.168.5.1 [board.mac.addr] 4.096ms Unicast reply from 192.168.5.1 [board.mac.addr] 2.872ms ... $ Unfortunately, there is a dependence on the axibus speed here $ iperf3 -c 192.168.5.1 Connecting to host 192.168.5.1, port 5201 [ 5] local 192.168.5.100 port 58936 connected to 192.168.5.1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 7.88 MBytes 65.8 Mbits/sec 0 150 KBytes [ 5] 1.00-2.00 sec 8.50 MBytes 71.4 Mbits/sec 0 165 KBytes [ 5] 2.00-3.00 sec 8.25 MBytes 69.2 Mbits/sec 0 165 KBytes [ 5] 3.00-4.01 sec 8.50 MBytes 71.1 Mbits/sec 0 165 KBytes [ 5] 4.01-5.00 sec 8.38 MBytes 70.3 Mbits/sec 0 165 KBytes [ 5] 5.00-6.00 sec 8.50 MBytes 71.5 Mbits/sec 0 165 KBytes [ 5] 6.00-7.01 sec 8.62 MBytes 72.0 Mbits/sec 0 174 KBytes [ 5] 7.01-8.00 sec 8.62 MBytes 72.8 Mbits/sec 0 174 KBytes [ 5] 8.00-9.00 sec 8.62 MBytes 72.2 Mbits/sec 0 174 KBytes [ 5] 9.00-10.04 sec 8.62 MBytes 69.9 Mbits/sec 0 174 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.04 sec 84.6 MBytes 70.7 Mbits/sec 0 sender [ 5] 0.00-10.12 sec 84.8 MBytes 70.3 Mbits/sec receiveriperf Done. $ ethtool -t eth0 ... The test extra info: 1. MAC Loopback 0 2. MAC Loopback (diff. queues) 0 3. PHY Loopback 0 ... ELP side: ... 17:29:11.974973 ARP, Reply ELP is-at elp.mac.addr(oui Unknown), length 28 17:29:12.975199 ARP, Request who-has ELP tell 192.168.5.100, length 46 17:29:12.975217 ARP, Reply ELP is-at elp.mac.addr(oui Unknown), length 28 17:29:13.975022 ARP, Request who-has ELP tell 192.168.5.100, length 46 17:29:13.975035 ARP, Reply ELP is-at elp.mac.addr(oui Unknown), length 28 17:29:14.974837 ARP, Request who-has ELP tell 192.168.5.100, length 46 17:29:14.974849 ARP, Reply ELP is-at elp.mac.addr(oui Unknown), length 28 17:29:15.975026 ARP, Request who-has ELP tell 192.168.5.100, length 46 ... Accepted connection from 192.168.5.100, port 58932 [ 5] local 192.168.5.1 port 5201 connected to 192.168.5.100 port 58936 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 7.12 MBytes 59.7 Mbits/sec [ 5] 1.00-2.00 sec 8.50 MBytes 71.3 Mbits/sec [ 5] 2.00-3.00 sec 8.50 MBytes 71.3 Mbits/sec [ 5] 3.00-4.00 sec 8.38 MBytes 70.3 Mbits/sec [ 5] 4.00-5.00 sec 8.50 MBytes 71.3 Mbits/sec [ 5] 5.00-6.00 sec 8.38 MBytes 70.3 Mbits/sec [ 5] 6.00-7.00 sec 8.62 MBytes 72.4 Mbits/sec [ 5] 7.00-8.00 sec 8.62 MBytes 72.3 Mbits/sec [ 5] 8.00-9.00 sec 8.62 MBytes 72.4 Mbits/sec [ 5] 9.00-10.00 sec 8.62 MBytes 72.4 Mbits/sec [ 5] 10.00-10.12 sec 896 KBytes 62.3 Mbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate [ 5] 0.00-10.12 sec 84.8 MBytes 70.3 Mbits/sec receiver DTS node example: ðernet_1g_tile { ... phy-mode = "rgmii-rxid"; phy-handle = <&phy1>; ... mdio: mdio { phy1: ethernet-phy@1 { ... compatible = "ethernet-phy-id0008.011b"; rx-internal-delay-ps = <1050>; dapu,tx-inverted-clk; ... }; }; }; -- Best regards, Artem Shimko ChangeLog: v3: - Use phy_get_internal_delay() for delay validation and selection - Add poll timeout for reset using read_poll_timeout() v2: - https://lore.kernel.org/all/20260716113805.593215-1-a.shimko.dev@gmail.com/T/#t v1: - https://lore.kernel.org/all/20260713131223.279555-1-a.shimko.dev@gmail.com/T/#t Artem Shimko (2): dt-bindings: net: add DAPU Telecom DAP8211R(I) PHY binding net: phy: add DAPU Telecom DAP8211R(I) Gigabit Ethernet PHY driver .../bindings/net/dapu,dap8211r.yaml | 73 +++++++ drivers/net/phy/Kconfig | 10 + drivers/net/phy/Makefile | 1 + drivers/net/phy/dap8211r.c | 191 ++++++++++++++++++ 4 files changed, 275 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/dapu,dap8211r.yaml create mode 100644 drivers/net/phy/dap8211r.c -- 2.43.0