linux-kernel - Re: [PATCH net-next v2 06/10] arm64: dts: allwinner: a527: cubie-a5e: Add ethernet PHY reset setting

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Message-ID: <aJyraGJ3JbvfGfEw@shell.armlinux.org.uk>
Date: Wed, 13 Aug 2025 16:12:40 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Chen-Yu Tsai <wens@...nel.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@...nel.org>,
	Samuel Holland <samuel@...lland.org>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Andre Przywara <andre.przywara@....com>
Subject: Re: [PATCH net-next v2 06/10] arm64: dts: allwinner: a527:
 cubie-a5e: Add ethernet PHY reset setting

On Wed, Aug 13, 2025 at 10:55:36PM +0800, Chen-Yu Tsai wrote:
> diff --git a/arch/arm64/boot/dts/allwinner/sun55i-a527-cubie-a5e.dts b/arch/arm64/boot/dts/allwinner/sun55i-a527-cubie-a5e.dts
> index 70d439bc845c..d4cee2222104 100644
> --- a/arch/arm64/boot/dts/allwinner/sun55i-a527-cubie-a5e.dts
> +++ b/arch/arm64/boot/dts/allwinner/sun55i-a527-cubie-a5e.dts
> @@ -94,6 +94,9 @@ &mdio0 {
>  	ext_rgmii_phy: ethernet-phy@1 {
>  		compatible = "ethernet-phy-ieee802.3-c22";
>  		reg = <1>;
> +		reset-gpios = <&pio 7 8 GPIO_ACTIVE_LOW>; /* PH8 */
> +		reset-assert-us = <10000>;
> +		reset-deassert-us = <150000>;

Please verify that kexec works with this, as if the calling kernel
places the PHY in reset and then kexec's, and the reset remains
asserted, the PHY will not be detected.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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