netdev - Re: [PATCH] phylib: add mdio-gpio bus driver (v2)

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Date:	Mon, 27 Oct 2008 09:41:02 -0700
From:	David Brownell <david-b@...bell.net>
To:	Grant Likely <grant.likely@...retlab.ca>,
	Paulius Zaleckas <paulius.zaleckas@...tonika.lt>
Cc:	netdev@...r.kernel.org, linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-embedded@...r.kernel.org
Subject: Re: [PATCH] phylib: add mdio-gpio bus driver (v2)

On Monday 27 October 2008, Grant Likely wrote:
> On Mon, Oct 27, 2008 at 12:53:22PM +0200, Paulius Zaleckas wrote:
> > Useful for machines where PHY control is connected to GPIO.
> > This driver also supports interrupts from PHY.

I get a kick out of seeing each new generic driver using
the generic GPIO interface.  I *should* have expected it,
obviously.  ;)

With a few exceptions I'll second Grant's comments, and
pick a few more nits.

> > +#include <linux/kernel.h>
> > +#include <linux/init.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/gpio.h>
> > +#include <linux/mdio-bitbang.h>
> > +#include <linux/mdio-gpio.h>
> 
> Missing:
> 
> MODULE_AUTHOR()
> MODULE_LICENSE()
> MODULE_DESCRIPTION()

... which many of us like to see at the *end* of the driver,
with other module housekeeping (driver registration), instead
of duplicating the header contents we just saw.

> > +static int __devinit mdio_gpio_probe(struct platform_device *pdev)

There are a few cases where platform drivers can't use __init
and platform_driver_probe(), instead of __devinit paired with
platform_driver_register().  Does this need to be one of them?

That is, are these platform devices going to be hotplugged?
(Usually because they are driver model children of other devices
which get hotplugged.)

> > +out:
> > +	return ret;
> 
> Nit:  labels in column 0 will confuse diff when it tries to put the
> function name in the diff hunk header.  If you indent the labels by 1
> space then future diffs will show the function name instead of the label
> name in diff hunk headers.

... but please don't change drivers to work around cosmitic diff bugs ...

> > +static int __devexit mdio_gpio_remove(struct platform_device *pdev)

As above:  if these devices are really hotpluggable, so be it.
But that's the exception for platform_device nodes, not the rule,
so I'd normally use __exit here (and __exit_p in the driver
structure, later) to shrink the runtime code footprint.

> > +static void mdio_gpio_exit(void)
> 
> static void __exit mdio_gpio_exit(void)
> 
> > +{
> > +	platform_driver_unregister(&mdio_gpio_driver);
> > +}
> > +
> > +module_init(mdio_gpio_init);
> > +module_exit(mdio_gpio_exit);

Also, snug the module_init()/module_exit() up against the
functions they affect, just as with EXPORT_SYMBOL().

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