linux-kernel - Re: [net-next: PATCH 03/12] net: dsa: switch to device_/fwnode

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Message-ID: <YrCxUfTDmvm9zLXq@smile.fi.intel.com>
Date:   Mon, 20 Jun 2022 20:41:37 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Marcin Wojtas <mw@...ihalf.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        netdev@...r.kernel.org, rafael@...nel.org, lenb@...nel.org,
        andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        olteanv@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, linux@...linux.org.uk,
        hkallweit1@...il.com, gjb@...ihalf.com, jaz@...ihalf.com,
        tn@...ihalf.com, Samer.El-Haj-Mahmoud@....com,
        upstream@...ihalf.com
Subject: Re: [net-next: PATCH 03/12] net: dsa: switch to device_/fwnode_ APIs

On Mon, Jun 20, 2022 at 05:02:16PM +0200, Marcin Wojtas wrote:
> In order to support both ACPI and DT, modify the generic
> DSA code to use device_/fwnode_ equivalent routines.
> No functional change is introduced by this patch.

...

>  	struct device_node	*dn;

What prevents us from removing this?

> +	struct fwnode_handle    *fwnode;

...

> -		dn = of_get_child_by_name(ds->dev->of_node, "mdio");
> +		fwnode = fwnode_get_named_child_node(ds->dev->fwnode, "mdio");

The rule of thumb is avoid dereferencing fwnode from struct device. So
dev_fwnode(), but here it would be achieved by device_get_named_child_node().

...

> -static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn)
> +static int dsa_switch_parse_of(struct dsa_switch *ds, struct fwnode_handle *fwnode)

Shouldn't _of suffix be replaced by, let's say, _fw?

...

> -	return dsa_switch_parse_ports_of(ds, dn);
> +	return dsa_switch_parse_ports_of(ds, fwnode);

Ditto.

...

> +	fwnode = ds->dev->fwnode;

dev_fwnode() or corresponding device_property_ API.

...

>  	slave_dev->dev.of_node = port->dn;
> +	slave_dev->dev.fwnode = port->fwnode;

device_set_node()

-- 
With Best Regards,
Andy Shevchenko