linux-kernel - [PATCH 5/5] arm64: dts: allwinner: a133-liontron-h-a133l: Add Ethernet support

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Message-ID: <20250626080923.632789-6-paulk@sys-base.io>
Date: Thu, 26 Jun 2025 10:09:23 +0200
From: Paul Kocialkowski <paulk@...-base.io>
To: netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Andre Przywara <andre.przywara@....com>,
	Paul Kocialkowski <paulk@...-base.io>
Subject: [PATCH 5/5] arm64: dts: allwinner: a133-liontron-h-a133l: Add Ethernet support

The Liontron H-A133L board features an Ethernet controller with a
JLSemi JL1101 PHY. Its reset pin is tied to the PH12 GPIO.

Note that the reset pin must be handled as a bus-wide reset GPIO in
order to let the MDIO core properly reset it before trying to read
its identification registers. There's no other device on the MDIO bus.

The datasheet of the PHY mentions that the reset signal must be held
for 1 ms to take effect. Make it 2 ms (and the same for post-delay) to
be on the safe side without wasting too much time during boot.

Signed-off-by: Paul Kocialkowski <paulk@...-base.io>
---
 .../sun50i-a133-liontron-h-a133l.dts          | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a133-liontron-h-a133l.dts b/arch/arm64/boot/dts/allwinner/sun50i-a133-liontron-h-a133l.dts
index fe77178d3e33..04dd7f781894 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a133-liontron-h-a133l.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a133-liontron-h-a133l.dts
@@ -65,6 +65,25 @@ &ehci1 {
 	status = "okay";
 };
 
+&emac {
+	pinctrl-names = "default";
+	pinctrl-0 = <&rmii_pins>;
+	phy-handle = <&rmii_phy>;
+	phy-mode = "rmii";
+	status = "okay";
+};
+
+&mdio {
+	reset-gpios = <&pio 7 12 GPIO_ACTIVE_LOW>; /* PH12 */
+	reset-delay-us = <2000>;
+	reset-post-delay-us = <2000>;
+
+	rmii_phy: ethernet-phy@1 {
+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <1>;
+	};
+};
+
 &mmc0 {
 	vmmc-supply = <&reg_dcdc1>;
 	cd-gpios = <&pio 5 6 GPIO_ACTIVE_LOW>; /* PF6 */
-- 
2.49.0