From 02f0efd60b423b4ce9b996f7c986dd68965a50d4 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jakub=20Van=C4=9Bk?= Date: Mon, 5 Jan 2026 00:10:46 +0100 Subject: [PATCH] mediatek: fix PHY autodetection on Cudy WR3000H MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Newer Cudy WR3000H units have a Motorcomm YT8821 PHY instead of a Realtek PHY on the WAN port. Before this commit, the Motorcomm PHY could not be autodetected by the kernel -- the PHY would show up as just a generic clause 45 PHY and the proper driver would not be loaded. The cause of the detection failure likely was that the YT8821 PHY was held in reset during PHY detection. To fix this, move the reset GPIO definition to the MDIO bus level. This reset line is deasserted before the autodetection process, see also [1]. With this change, both Realtek and Motorcomm PHYs can be supported with a single device tree. [1]: https://lore.kernel.org/all/20251119134750.394655-1-horatiu.vultur@microchip.com/ Signed-off-by: Jakub Vaněk Link: https://github.com/openwrt/openwrt/pull/21399 Signed-off-by: Hauke Mehrtens --- target/linux/mediatek/dts/mt7981b-cudy-wr3000h-v1.dts | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/target/linux/mediatek/dts/mt7981b-cudy-wr3000h-v1.dts b/target/linux/mediatek/dts/mt7981b-cudy-wr3000h-v1.dts index 69e1098b434..530748a4c69 100644 --- a/target/linux/mediatek/dts/mt7981b-cudy-wr3000h-v1.dts +++ b/target/linux/mediatek/dts/mt7981b-cudy-wr3000h-v1.dts @@ -101,13 +101,17 @@ }; &mdio_bus { + /* We need to have the reset GPIO on the MDIO bus node, + * otherwise the PHY would be held in reset during PHY detection */ + reset-gpios = <&pio 3 GPIO_ACTIVE_LOW>; + reset-delay-us = <100000>; + reset-post-delay-us = <100000>; phy6: ethernet-phy@6 { + /* Either Realtek RTL8221B-VB-CG or Motorcomm YT8821, + * depending on HW revision */ compatible = "ethernet-phy-ieee802.3-c45"; reg = <6>; - reset-assert-us = <100000>; - reset-deassert-us = <100000>; - reset-gpios = <&pio 3 GPIO_ACTIVE_LOW>; }; }; -- 2.47.3