Re: [PATCH v3 06/13] arm64: dts: mediatek: mt7988: add basic ethernet-nodes

[Daniel Golle]

On Sun, Jun 08, 2025 at 11:14:39PM +0200, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@xxxxxxxxxxxxxxx>
> 
> Add basic ethernet related nodes.
> 
> Mac1+2 needs pcs (sgmii+usxgmii) to work correctly which will be linked
> later when driver is merged.
> 
> Signed-off-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
> Signed-off-by: Frank Wunderlich <frank-w@xxxxxxxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/mediatek/mt7988a.dtsi | 124 +++++++++++++++++++++-
>  1 file changed, 121 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
> index 560ec86dbec0..ee1e01d720fe 100644
> --- a/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt7988a.dtsi
> +
> +		eth: ethernet@15100000 {
> +			compatible = "mediatek,mt7988-eth";
> +			reg = <0 0x15100000 0 0x80000>,
> +			      <0 0x15400000 0 0x200000>;
> +			interrupts = <GIC_SPI 196 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 197 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 198 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 199 IRQ_TYPE_LEVEL_HIGH>;

It would be better to use MT7988 with RSS and add the additional
interrupts for doing so before introducing support for this SoC without
RSS. In this way we would avoid having to deal with keeping the DT
support compatible with the old (ie. 4 IRQs) way while also supporting the
RSS-way (with a total of 8 IRQs).
Alternatively, if we really want to support MT7988 with and without RSS we
should use 'interrupt-names' instead of unnamed interrupts imho.