linux-kernel - Re: [PATCH net-next v2 13/14] net: dsa: mt7530: introduce driver for MT7988 built-in switch

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Message-ID: <20230425155137.GA19130@pengutronix.de>
Date:   Tue, 25 Apr 2023 17:51:37 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Daniel Golle <daniel@...rotopia.org>
Cc:     netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "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>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Arınç Ünal <arinc.unal@...nc9.com>,
        Sam Shih <Sam.Shih@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        John Crispin <john@...ozen.org>, Felix Fietkau <nbd@....name>
Subject: Re: [PATCH net-next v2 13/14] net: dsa: mt7530: introduce driver for
 MT7988 built-in switch

Hi Daniel,

On Mon, Apr 03, 2023 at 02:19:40AM +0100, Daniel Golle wrote:
> Add driver for the built-in Gigabit Ethernet switch which can be found
> in the MediaTek MT7988 SoC.
> 
> The switch shares most of its design with MT7530 and MT7531, but has
> it's registers mapped into the SoCs register space rather than being
> connected externally or internally via MDIO.
> 
> Introduce a new platform driver to support that.
> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> ---
>  MAINTAINERS                   |   2 +
>  drivers/net/dsa/Kconfig       |  12 +++
>  drivers/net/dsa/Makefile      |   1 +
>  drivers/net/dsa/mt7530-mmio.c | 101 +++++++++++++++++++++++++
[...]
> diff --git a/drivers/net/dsa/mt7530-mmio.c b/drivers/net/dsa/mt7530-mmio.c
> new file mode 100644
> index 0000000000000..1a3d4b692f349
> --- /dev/null
> +++ b/drivers/net/dsa/mt7530-mmio.c
> @@ -0,0 +1,101 @@
[...]
> +	priv->rstc = devm_reset_control_get(&pdev->dev, NULL);

Please use devm_reset_control_get_exclusive() directly.

> +	if (IS_ERR(priv->rstc)) {
> +		dev_err(&pdev->dev, "Couldn't get our reset line\n");
> +		return PTR_ERR(priv->rstc);

Not sure if this can actually happen, but there is no need to warn on
-EPROBE_DEFER. You could use return dev_err_probe(...) here.

regards
Philipp