From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792786025; b=s0VP9ayf2O6dd8HCgnoubA2Jjf+9siGOlGvqwYUyczP9YikyBtrPuNSQXDT+MbtTZXdE NtkA+KMk+IuFi0GiA0QaiEOBLjyc2OtC2Aj/smY+LvxY/+rPD8YjX+88NFfcYkMeEGio9 T3AiLrLxvu6cQ6G7K9/frBgjdigLu71t+aWH9t4EGSvT9wW1jBDUhPupdN7kQXWfRTc5k R/aeVlbNGVL4EXgBvOdKp5MCuULGHykKUnVzmqty2A6tcdjNM3IDKWXOMlaBXNaGTfm54 GbVIBizgkNVK837ly4HnR2HhIsiDUeD4bQ5WMBmQ2X5OGFzTOQt3qGINLhkkZ1f3ppg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792786025; h=Received:DKIM-Signature:Message-ID:From:Subject:Reply-To:To:Cc: In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date; bh=rwkE1XbChLJLaa3WTB3mh24jVj/qSIsomJRKnW/5jOk=; b=1HY60gGpWYJjlIm1IaFrMHDPjfNyHVxZE69HCZ4Vkblwd3XVdZo2J6l2lF0ozoszoS88 zhZiD5NhmPf+2Rs/05ZdqyhKSC62OUcbIRfHXNGzTqaQnTS+iOs5NPC6+DkMkJDWHpemV 4s9cxntOA5PO34S86qMLzkLxQh6AUP5cbHwgmjYrfpFU8abLjAD6G7u5B8uk608v63mer 0uEOqIhs+/xrxtw7pZiHAuDwg5M0o71llfhOshoD0LcOLunSC4IFegwVyz1OYdYZNx4D5 qLZU+dipRVXTmYaWbo9YLj986Wkz8YfnBLV5bXmgokQpRy32pehT86jBLQySyOuHJWQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=LVClSG71; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C62DB606A31A for ; Fri, 23 Oct 2026 20:07:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=LVClSG71 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1AFC91F01825; Fri, 23 Oct 2026 20:07:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792786024; bh=rwkE1XbChLJLaa3WTB3mh24jVj/qSIsomJRKnW/5jOk=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=LVClSG71hCcqOv5/eqtNo2R93zJuycAigxfqw86fZUBbomVlfaGpfeBbZdQ/vsFz5 N7TmXuWw5qwYYMBDgMfiUd+cLNmMwEM4Ir63RyPHcRYbZuyQF1I8490n8TvXIYne45 tHWnJ3SYbW53gkbijy1p9RZKHDC6xx6uQ5T/NVocFW6R5l8YonKDfbAJd70MK+TnEs UeP7jhTPZkaLsJRyKXhi/HEGO10TZtpTJwF/RMOl/AG4RzqdEuPZ/lhPtTZPkN85xc F91FTr4hGqwtVZIhYy+cREuNm4oYhdQxMuU/SckVO41R0tb3Tfvuo2ICIjLtTjzxeF 80fX3G0AsiUzw== Message-ID: From: sashiko-bot@kernel.org Subject: Re: [PATCH v4 6/7] arm64: dts: amlogic: t7: add the ethernet controller Reply-To: sashiko-reviews@lists.linux.dev To: "Lucas Tanure" Cc: devicetree@vger.kernel.org, linux-amlogic@lists.infradead.org, robh@kernel.org, conor+dt@kernel.org, neil.armstrong@linaro.org In-Reply-To: <20261022200640.3101932-7-tanure@linux.com> References: <20261022200640.3101932-1-tanure@linux.com> <20261022200640.3101932-7-tanure@linux.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Fri, 23 Oct 2026 20:07:03 +0000 X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Thank you for your contribution! Sashiko AI review found 1 potential issue(= s) to consider: - [Medium] arm64: dts: amlogic: t7: missing status disabled on untested int= ernal_ephy -- commit 8b67e94cfb48fb74bfbb5053e5ce7da85b48466a Author: Lucas Tanure arm64: dts: amlogic: t7: add the ethernet controller This patch adds the Synopsys DWMAC ethernet controller, the MDIO multiplexe= r, and the internal 100M PHY nodes to the Amlogic T7 SoC device tree. > diff --git a/arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi b/arch/arm64/boo= t/dts/amlogic/amlogic-t7.dtsi > index 7bd53ec166071..94ea225145015 100644 > --- a/arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi > +++ b/arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi [ ... ] > @@ -645,6 +672,37 @@ gpio_intc: interrupt-controller@4080 { > <10 11 12 13 14 15 16 17 18 19 20 21>; > }; > =20 > + eth_phy: mdio-multiplexer@28000 { > + compatible =3D "amlogic,g12a-mdio-mux"; > + reg =3D <0x0 0x28000 0x0 0xa4>; > + clocks =3D <&clkc_periphs CLKID_SYS_ETHPHY>, > + <&xtal>, > + <&scmi_clk CLKID_FCLK_50M>; > + clock-names =3D "pclk", "clkin0", "clkin1"; > + mdio-parent-bus =3D <&mdio0>; > + #address-cells =3D <1>; > + #size-cells =3D <0>; > + > + ext_mdio: mdio@0 { > + reg =3D <0>; > + #address-cells =3D <1>; > + #size-cells =3D <0>; > + }; > + > + int_mdio: mdio@1 { > + reg =3D <1>; > + #address-cells =3D <1>; > + #size-cells =3D <0>; > + > + internal_ephy: ethernet-phy@8 { > + compatible =3D "ethernet-phy-id0180.3301", > + "ethernet-phy-ieee802.3-c22"; > + interrupts =3D ; > + reg =3D <8>; > + }; > + }; > + }; [Severity: Medium] The commit message states: The on-chip PHY follows the G12A; no board in tree uses it, so it is untested. It stays disabled for boards to enable. However, in arch/arm64/boot/dts/amlogic/amlogic-t7.dtsi, only ethmac has status =3D "disabled"; while eth_phy, int_mdio, and internal_ephy are all l= eft enabled by default. When a board enables ethmac (even to use an external RGMII PHY on ext_mdio), g12a_mdio_mux_probe() calls mdio_mux_init() in drivers/net/mdio/mdio-mux.c, which registers every available child bus: for_each_available_child_of_node(mux_node, child_bus_node) { ... r =3D of_mdiobus_register(cb->mii_bus, child_bus_node); Because internal_ephy under int_mdio is available and specifies a hardcoded PHY ID compatible string ("ethernet-phy-id0180.3301"), __of_mdiobus_parse_phys() in drivers/net/mdio/of_mdio.c creates and registe= rs the PHY device without reading hardware ID registers: of_mdiobus_register() -> __of_mdiobus_parse_phys() -> fwnode_mdiobus_register_phy() -> phy_device_register() -> device_add() -> phy_probe() During phy_probe() in drivers/net/phy/phy_device.c, MDIO reads issued by phy_disable_interrupts() and genphy_read_abilities() switch the mux to child bus 1 via g12a_mdio_switch_fn() -> g12a_enable_internal_mdio() in drivers/net/mdio/mdio-mux-meson-g12a.c: if (!__clk_is_enabled(priv->pll)) { ret =3D clk_prepare_enable(priv->pll); if (ret) return ret; } ... writel(PHY_CNTL2_USE_INTERNAL | PHY_CNTL2_SMI_SRC_MAC | PHY_CNTL2_RX_CLK_EPHY, priv->regs + ETH_PHY_CNTL2); value |=3D PHY_CNTL1_PHY_ENB; writel(value, priv->regs + ETH_PHY_CNTL1); This powers on the untested internal EPHY PLL and enables the internal PHY = in ETH_PHY_CNTL1 and ETH_PHY_CNTL2 even on boards using an external PHY. Additionally, on T7 boards that leave ethmac disabled, leaving eth_phy enabled causes g12a_mdio_mux_probe() to enable pclk, program the PLL registers in g12a_ephy_pll_init(), and then fail in mdio_mux_init() with -EPROBE_DEFER because mdio0 is never registered. Should internal_ephy (or int_mdio) and eth_phy have status =3D "disabled"; = so that the untested internal PHY stays disabled until a board explicitly enables it? > =20 > uart_a: serial@78000 { > compatible =3D "amlogic,t7-uart", "amlogic,meson-s4-uart"; > reg =3D <0x0 0x78000 0x0 0x18>; --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20261022200640.3101= 932-1-tanure@linux.com?part=3D6 From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7784F606A31A for ; Fri, 23 Oct 2026 20:07:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 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