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Message-ID: <d78949f0-bb03-82ea-b40f-1bb92b41e200@ti.com>
Date: Thu, 21 Dec 2023 14:26:24 +0530
From: Ravi Gunasekaran <r-gunasekaran@...com>
To: Arınç ÜNAL <arinc.unal@...nc9.com>,
Daniel Golle
<daniel@...rotopia.org>,
Landen Chao <Landen.Chao@...iatek.com>,
DENG
Qingfang <dqfext@...il.com>, Sean Wang <sean.wang@...iatek.com>,
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>
CC: David Bauer <mail@...id-bauer.net>, <mithat.guner@...ont.com>,
<erkin.bozoglu@...ont.com>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
Ravi Gunasekaran <r-gunasekaran@...com>
Subject: Re: [PATCH net-next] net: dsa: mt7530: register OF node for internal
MDIO bus
On 12/20/23 11:05 PM, Arınç ÜNAL wrote:
> From: David Bauer <mail@...id-bauer.net>
>
> The MT753x switches provide a switch-internal MDIO bus for the embedded
> PHYs.
>
> Register a OF sub-node on the switch OF-node for this internal MDIO bus.
> This allows to configure the embedded PHYs using device-tree.
>
> Signed-off-by: David Bauer <mail@...id-bauer.net>
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---
> drivers/net/dsa/mt7530.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index 391c4dbdff42..f8ecc354630b 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -2155,10 +2155,13 @@ mt7530_setup_mdio(struct mt7530_priv *priv)
> {
> struct dsa_switch *ds = priv->ds;
> struct device *dev = priv->dev;
> + struct device_node *np, *mnp;
> struct mii_bus *bus;
> static int idx;
> int ret;
>
> + np = priv->dev->of_node;
> +
> bus = devm_mdiobus_alloc(dev);
> if (!bus)
> return -ENOMEM;
> @@ -2177,7 +2180,9 @@ mt7530_setup_mdio(struct mt7530_priv *priv)
> if (priv->irq)
> mt7530_setup_mdio_irq(priv);
>
> - ret = devm_mdiobus_register(dev, bus);
> + mnp = of_get_child_by_name(np, "mdio");
If the node is not found, then the return value would be NULL.
Though devm_of_mdiobus_register() and of_node_put() take care of NULL references,
other drivers that use devm_of_mdiobus_register() mostly perform a early exit if the node is NULL.
> + ret = devm_of_mdiobus_register(dev, bus, mnp);
> + of_node_put(mnp);
> if (ret) {
> dev_err(dev, "failed to register MDIO bus: %d\n", ret);
> if (priv->irq)
--
Regards,
Ravi
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