linux-kernel - Re: [PATCH v2 3/5] arm64: dts: allwinner: a523: Add EMAC0 ethernet MAC

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Message-ID: <CAGb2v66a4ERAf_YhPkMWJjm26SsfjO3ze_Zp=QqkXNDLaLnBRg@mail.gmail.com>
Date: Fri, 25 Apr 2025 13:26:25 +0800
From: Chen-Yu Tsai <wens@...e.org>
To: Yixun Lan <dlan@...too.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
	Samuel Holland <samuel@...lland.org>, Maxime Ripard <mripard@...nel.org>, 
	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>, 
	Andre Przywara <andre.przywara@....com>, Corentin Labbe <clabbe.montjoie@...il.com>, 
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org
Subject: Re: [PATCH v2 3/5] arm64: dts: allwinner: a523: Add EMAC0 ethernet MAC

On Thu, Apr 24, 2025 at 6:09 PM Yixun Lan <dlan@...too.org> wrote:
>
> Add EMAC0 ethernet MAC support which found on A523 variant SoCs,
> including the A527/T527 chips. MAC0 is compatible to the A64 chip which
> requires an external PHY. This patch only add RGMII pins for now.
>
> Signed-off-by: Yixun Lan <dlan@...too.org>
> ---
>  arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi | 40 ++++++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi
> index ee485899ba0af69f32727a53de20051a2e31be1d..c9a9b9dd479af05ba22fe9d783e32f6d61a74ef7 100644
> --- a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi
> @@ -126,6 +126,15 @@ pio: pinctrl@...0000 {
>                         interrupt-controller;
>                         #interrupt-cells = <3>;
>
> +                       rgmii0_pins: rgmii0-pins {
> +                               pins = "PH0", "PH1", "PH2", "PH3", "PH4",
> +                                      "PH5", "PH6", "PH7", "PH9", "PH10",
> +                                      "PH14", "PH15", "PH16", "PH17", "PH18";
> +                               allwinner,pinmux = <5>;
> +                               function = "emac0";
> +                               drive-strength = <40>;

We should probably add

                                  bias-disable;

to explicitly turn off pull-up and pull-down.

ChenYu