linux-kernel - Re: [PATCH 3/3] net: via-rhine: add OF bus binding

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Message-ID: <CABjd4Yz2Kfed_qBfSAEXoAcVxfsmhTBA-83YJ9_iSwPZ+r1qYQ@mail.gmail.com>
Date:	Mon, 27 Jan 2014 19:34:40 +0400
From:	Alexey Charkov <alchark@...il.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	netdev@...r.kernel.org, Tony Prisk <linux@...sktech.co.nz>,
	devicetree@...r.kernel.org, Roger Luethi <rl@...lgate.ch>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] net: via-rhine: add OF bus binding

2014/1/27 Ben Hutchings <ben@...adent.org.uk>:
> On Mon, 2014-01-27 at 15:51 +0400, Alexey Charkov wrote:
>> This should make the driver usable with VIA/WonderMedia ARM-based
>> Systems-on-Chip integrated Rhine III adapters. Note that these
>> are always in MMIO mode, and don't have any known EEPROM.
> [...]
>> --- a/drivers/net/ethernet/via/Kconfig
>> +++ b/drivers/net/ethernet/via/Kconfig
>> @@ -19,7 +19,7 @@ if NET_VENDOR_VIA
>>
>>  config VIA_RHINE
>>         tristate "VIA Rhine support"
>> -       depends on PCI
>> +       depends on (PCI || USE_OF)
>>         select CRC32
>>         select MII
>>         ---help---
>
> This seems like the right thing to do, but it means you need to add
> #ifdef CONFIG_PCI and #ifdef CONFIG_USE_OF around the driver structures
> and related functions.

Frankly, I would like to avoid that if possible (as pointed out in the
cover email), as I believe we would get a cleaner driver without
#ifdef. This is also the way it was done in via-velocity, and it works
just fine.

> You should compile-test in configurations that have just one of those
> dependencies enabled.

This has been compile-tested and runtime-tested in OF-only
configuration on WM8950, and Roger also tested it in PCI-only
configuration, so it seems to work fine.

> [...]
>> --- a/drivers/net/ethernet/via/via-rhine.c
>> +++ b/drivers/net/ethernet/via/via-rhine.c
> [...]
>> @@ -847,7 +856,8 @@ static void rhine_hw_init(struct net_device *dev, long pioaddr)
>>               msleep(5);
>>
>>       /* Reload EEPROM controlled bytes cleared by soft reset */
>> -     rhine_reload_eeprom(pioaddr, dev);
>> +     if (!strncmp(dev->dev.parent->bus->name, "pci", 3))
>> +             rhine_reload_eeprom(pioaddr, dev);
> [...]
>
> Ew.  I think you should use dev_is_pci(), although you might also need
> to guard that with #ifdef CONFIG_PCI.

Oh, cool. Didn't realize it existed :) Will adjust, thanks.

I believe the #ifdef is not strictly required, though, as we include
the PCI header anyway (and the macro expands to just a simple test).
Any specific concerns why we should do that, apart from the +3.8%
module size increase?

Thanks,
Alexey
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