linux-kernel - Re: [PATCH 2/5] char: tile-srom: Remove reference to platform

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Date:	Thu, 31 Jul 2014 14:32:27 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	Pawel Moll <pawel.moll@....com>, Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Catalin Marinas <Catalin.Marinas@....com>, paul@...an.com,
	Arnd Bergmann <arnd@...db.de>,
	Peter De Schrijver <pdeschrijver@...dia.com>, arm@...nel.org,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] char: tile-srom: Remove reference to platform_bus

On Thu, Jul 31, 2014 at 04:24:37PM -0400, Chris Metcalf wrote:
> On 7/25/2014 10:23 AM, Pawel Moll wrote:
> >The code was creating "srom" class devices using
> >platform_bus as a parent. As they are not really
> >platform devices, make them virtual, using NULL instead.
> >
> >Cc: Chris Metcalf<cmetcalf@...era.com>
> >Signed-off-by: Pawel Moll<pawel.moll@....com>
> >---
> >  drivers/char/tile-srom.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Can you clarify the point of this change a bit?  The SROM devices
> in question are real devices (bits of silicon on the processor die), not
> some kind of virtual construct.

Then tie them to the "real" parent device that they live on, don't try
to hang them under the platform bus where they don't belong.

> In addition, we also have user binaries in the wild that know to look
> for /sys/devices/platform/srom/ paths,

That's never a good idea, you should be iterating over your bus's
devices, to find your devices, not at a specific location within the
/sys/devices/ tree, as that is guaranteed to move around over time.
It's also why we have those symlinks and lists of devices in your bus
directory.

> so I'm pretty reluctant to change this path without good reason.

Because srom is not a platform device, so why would you put it at the
root of the platform device "tree"?

thanks,

greg kh
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