linux-kernel - Re: [net-next v1] net: ethernet: mtk_eth

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Message-ID: <aE0pav5c8Ji1Q7br@lore-rh-laptop>
Date: Sat, 14 Jun 2025 09:48:58 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Frank Wunderlich <linux@...web.de>
Cc: Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>,
	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>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Frank Wunderlich <frank-w@...lic-files.de>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, daniel@...rotopia.org
Subject: Re: [net-next v1] net: ethernet: mtk_eth_soc: support named IRQs

> From: Frank Wunderlich <frank-w@...lic-files.de>
> 
> Add named interrupts and keep index based fallback for exiting devicetrees.
> 
> Currently only rx and tx IRQs are defined to be used with mt7988, but
> later extended with RSS/LRO support.
> 
> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 24 +++++++++++++--------
>  1 file changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index b76d35069887..fcec5f95685e 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -5106,17 +5106,23 @@ static int mtk_probe(struct platform_device *pdev)
>  		}
>  	}
>  
> -	for (i = 0; i < 3; i++) {
> -		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
> -			eth->irq[i] = eth->irq[0];
> -		else
> -			eth->irq[i] = platform_get_irq(pdev, i);
> -		if (eth->irq[i] < 0) {
> -			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
> -			err = -ENXIO;
> -			goto err_wed_exit;
> +	eth->irq[1] = platform_get_irq_byname(pdev, "tx");
> +	eth->irq[2] = platform_get_irq_byname(pdev, "rx");

Hi Frank,

doing so you are not setting eth->irq[0] for MT7988 devices but it is actually
used in mtk_add_mac() even for non-MTK_SHARED_INT devices. I guess we can reduce
the eth->irq array size to 2 and start from 0 even for the MT7988 case.
What do you think?

Regards,
Lorenzo

> +	if (eth->irq[1] < 0 || eth->irq[2] < 0) {
> +		for (i = 0; i < 3; i++) {
> +			if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
> +				eth->irq[i] = eth->irq[0];
> +			else
> +				eth->irq[i] = platform_get_irq(pdev, i);
> +
> +			if (eth->irq[i] < 0) {
> +				dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
> +				err = -ENXIO;
> +				goto err_wed_exit;
> +			}
>  		}
>  	}
> +
>  	for (i = 0; i < ARRAY_SIZE(eth->clks); i++) {
>  		eth->clks[i] = devm_clk_get(eth->dev,
>  					    mtk_clks_source_name[i]);
> -- 
> 2.43.0
> 

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