netdev - Re: [PATCH 03/14] net: ks8851: Pass device pointer into ks8851_init

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Date:   Tue, 24 Mar 2020 08:08:01 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Marek Vasut <marex@...x.de>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Petr Stetiar <ynezz@...e.cz>,
        YueHaibing <yuehaibing@...wei.com>
Subject: Re: [PATCH 03/14] net: ks8851: Pass device pointer into
 ks8851_init_mac()

On Tue, Mar 24, 2020 at 02:06:22AM +0100, Andrew Lunn wrote:
> On Tue, Mar 24, 2020 at 12:42:52AM +0100, Marek Vasut wrote:
> > Since the driver probe function already has a struct device *dev pointer,
> > pass it as a parameter to ks8851_init_mac() to avoid fishing it out via
> > ks->spidev. This is the only reference to spidev in the function, so get
> > rid of it. This is done in preparation for unifying the KS8851 SPI and
> > parallel drivers.
[...]
> > -static void ks8851_init_mac(struct ks8851_net *ks)
> > +static void ks8851_init_mac(struct ks8851_net *ks, struct device *ddev)
> >  {
> >  	struct net_device *dev = ks->netdev;
> >  	const u8 *mac_addr;
> >  
> > -	mac_addr = of_get_mac_address(ks->spidev->dev.of_node);
> > +	mac_addr = of_get_mac_address(ddev->of_node);
> 
> The name ddev is a bit odd. Looking at the code, i see why. dev is
> normally a struct net_device, which this function already has.
> 
> You could avoid this oddness by directly passing of_node.

Actually after adding the invocation of of_get_mac_address() with
commit 566bd54b067d ("net: ks8851: Support DT-provided MAC address")
I've had regrets that I should have used device_get_mac_address()
instead since it's platform-agnostic, hence would work with ACPI
as well as DT-based systems.

device_get_mac_address() needs a struct device, so I'd prefer
using that instead of passing an of_node.

I agree that "ddev" is somewhat odd.  Some drivers name it "device"
or "pdev" (which however collides with the naming of platform_devices).
Another idea would be to move the handy ndev_to_dev() static inline
from apm/xgene/xgene_enet_main.h to include/linux/netdevice.h and
use that with "struct net_device *dev", which we already have in
ks8851_init_mac().

Thanks,

Lukas