linux-kernel - Re: [PATCH v3] pcmcia: CompactFlash driver for PA Semi Electra boards

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Message-Id: <20070720164823.95608e43.akpm@linux-foundation.org>
Date:	Fri, 20 Jul 2007 16:48:23 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	olof@...om.net (Olof Johansson)
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, linux-pcmcia@...ts.infradead.org,
	linuxppc-dev@...abs.org, miltonm@....com
Subject: Re: [PATCH v3] pcmcia: CompactFlash driver for PA Semi Electra
 boards

On Thu, 5 Jul 2007 09:49:14 -0500
olof@...om.net (Olof Johansson) wrote:

> Driver for the CompactFlash slot on the PA Semi Electra eval board. It's
> a simple device sitting on localbus, with interrupts and detect/voltage
> control over GPIO.
> 
> The driver is implemented as an of_platform driver, and adds localbus
> as a bus being probed by the of_platform framework.
> 
> 
> Signed-off-by: Olof Johansson <olof@...om.net>
> 
> ---
> 
> On Mon, Jun 25, 2007 at 03:43:41PM -0500, olof wrote:
> 
> > The ifdef is needed since for CONFIG_PCMCIA=n builds, the bus notifier
> > isn't available. I wanted to do the bus notifier registration explicitly
> > before the of_platform bus probe to avoid later surprises due to reordered
> > initcalls in case it was split up in it's own initcall.
> > 
> > I could add the code under ifdef as well, but it didn't seem too
> > critical. Once the second major board comes along I'll probably move it
> > out to a per-board file, there's no real need for it just yet.
> 
> Alright, turns out I still need to declare the extern bus type, which would mean
> two #ifdefs in one function. Moving it out instead.
> 
> I've addressed Milton's comments as well.
> 
> Who's maintaining PCMCIA? MAINTAINERS only lists a mailing list, no person. Seems
> weird for a component that's marked as maintained.

Dominik Brodowski.  He's having a bit of downtime at present (exams, I
think).  He expects to return.  Meanwhile, cc'ing me usually has some
effect.

>
> ...
>
> +static const char driver_name[] = "electra-cf";
>
> ...
>
> +static struct of_device_id electra_cf_match[] =
> +{
> +	{
> +		.compatible   = "electra-cf",
> +	},
> +	{},
> +};

Could have reused driver_name[] here, if that was appropriate.

> +static struct of_platform_driver electra_cf_driver =
> +{
> +	.name	   = (char *)driver_name,

ug.  But it's not your fault - we should have always made it const.

> --- mainline.orig/arch/powerpc/platforms/pasemi/setup.c
> +++ mainline/arch/powerpc/platforms/pasemi/setup.c

I never know who maintains random-scruffy-ppc code like this.  From a peek
in the git-whatchanged output, it appears to be yourself.


Have a few little fixies:

--- a/drivers/pcmcia/electra_cf.c~pcmcia-compactflash-driver-for-pa-semi-electra-boards-fix
+++ a/drivers/pcmcia/electra_cf.c
@@ -201,9 +201,7 @@ static int __devinit electra_cf_probe(st
 	if (!cf)
 		return -ENOMEM;
 
-	init_timer(&cf->timer);
-	cf->timer.function = electra_cf_timer;
-	cf->timer.data = (unsigned long) cf;
+	setup_timer(&cf->timer, electra_cf_timer, (unsigned long)cf);
 	cf->irq = NO_IRQ;
 
 	cf->ofdev = ofdev;
@@ -340,16 +338,14 @@ static int __devexit electra_cf_remove(s
 	return 0;
 }
 
-static struct of_device_id electra_cf_match[] =
-{
+static struct of_device_id electra_cf_match[] = {
 	{
 		.compatible   = "electra-cf",
 	},
 	{},
 };
 
-static struct of_platform_driver electra_cf_driver =
-{
+static struct of_platform_driver electra_cf_driver = {
 	.name	   = (char *)driver_name,
 	.match_table    = electra_cf_match,
 	.probe	  = electra_cf_probe,
@@ -371,4 +367,3 @@ module_exit(electra_cf_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR ("Olof Johansson <olof@...om.net>");
 MODULE_DESCRIPTION("PA Semi Electra CF driver");
-
_

-
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