linux-kernel - Re: [PATCH 2/3] ARM: mxs: add gpio-mxs platform devices

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Date:	Fri, 20 May 2011 16:23:40 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Shawn Guo <shawn.guo@...aro.org>, linux-kernel@...r.kernel.org,
	patches@...aro.org, linus.walleij@...aro.org,
	grant.likely@...retlab.ca, kernel@...gutronix.de
Subject: Re: [PATCH 2/3] ARM: mxs: add gpio-mxs platform devices

On Friday 20 May 2011 16:03:17 Shawn Guo wrote:
> On Fri, May 20, 2011 at 12:23:00PM +0200, Arnd Bergmann wrote:
> > 
> > I know it's tempting to use macros for these, but I think it obscures
> > the code a lot, especially when you use them to concatenate identifier
> > names. Why not just do:
> > 
> The pattern is being widely used in mxc/mxs platform device codes.
> If you are not extremely unhappy about this, I would leave it as it
> is to keep consistency.

I think it's a real pain to do it like this, and we need to start
at some point cleaning up the mess. Why not start now?

> > > +
> > > +	return mxs_add_platform_device("mxs-gpio", data->id,
> > > +					res, ARRAY_SIZE(res), NULL, 0);
> > > +}
> > 
> > mxs_add_platform_device doesn't set the parent pointer correctly, I think you
> > should either fix that or open-code the platform device creation to do it
> > right.
> > 
> I see the following in drivers/base/platform.c, function
> platform_device_add():
> 
>         if (!pdev->dev.parent)
>                 pdev->dev.parent = &platform_bus;
> 
> So we are fine?

No, this would put all gpio devices below the top-level /sys/devices/platform
directory, where they certainly don't belong. Please find a proper
place and put them there.

	Arnd
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