netdev - Re: [net-next PATCH v15 08/12] net: dsa: Add Airoha AN8855 5-Port Gigabit DSA Switch driver

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Message-ID: <9f60809e-ad8c-4f97-961a-d13fa5031981@t-8ch.de>
Date: Sat, 28 Jun 2025 10:33:44 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...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>, Vladimir Oltean <olteanv@...il.com>, 
	Srinivas Kandagatla <srini@...nel.org>, Heiner Kallweit <hkallweit1@...il.com>, 
	Russell King <linux@...linux.org.uk>, "Chester A. Unal" <chester.a.unal@...nc9.com>, 
	Daniel Golle <daniel@...rotopia.org>, DENG Qingfang <dqfext@...il.com>, 
	Sean Wang <sean.wang@...iatek.com>, Simon Horman <horms@...nel.org>, 
	Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH v15 08/12] net: dsa: Add Airoha AN8855 5-Port
 Gigabit DSA Switch driver

On 2025-06-26 23:23:07+0200, Christian Marangi wrote:
> Add Airoha AN8855 5-Port Gigabit DSA switch. Switch can support
> 10M, 100M, 1Gb, 2.5G and 5G Ethernet Speed but 5G is currently error out
> as it's not currently supported as requires additional configuration for
> the PCS.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>  drivers/net/dsa/Kconfig  |    9 +
>  drivers/net/dsa/Makefile |    1 +
>  drivers/net/dsa/an8855.c | 2386 ++++++++++++++++++++++++++++++++++++++
>  drivers/net/dsa/an8855.h |  773 ++++++++++++
>  4 files changed, 3169 insertions(+)
>  create mode 100644 drivers/net/dsa/an8855.c
>  create mode 100644 drivers/net/dsa/an8855.h

<snip>

> +static int an8855_switch_probe(struct platform_device *pdev)
> +{
> +	struct an8855_priv *priv;
> +
> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	/* Get regmap from MFD */
> +	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> +	if (!priv->regmap)
> +		return -ENOENT;
> +
> +	priv->ds = devm_kzalloc(&pdev->dev, sizeof(*priv->ds), GFP_KERNEL);
> +	if (!priv->ds)
> +		return -ENOMEM;
> +
> +	priv->ds->dev = &pdev->dev;
> +	priv->ds->num_ports = AN8855_NUM_PORTS;
> +	priv->ds->priv = priv;
> +	priv->ds->ops = &an8855_switch_ops;
> +	devm_mutex_init(&pdev->dev, &priv->reg_mutex);

Check the return value of devm_mutex_init().
This will become a compile error soon.

> +	priv->ds->phylink_mac_ops = &an8855_phylink_mac_ops;
> +
> +	priv->pcs.ops = &an8855_pcs_ops;
> +	priv->pcs.poll = true;
> +
> +	dev_set_drvdata(&pdev->dev, priv);
> +
> +	return dsa_register_switch(priv->ds);
> +}

<snip>