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

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Date:	Tue, 5 Aug 2014 16:06:54 -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" <paul@...an.com>, Arnd Bergmann <arnd@...db.de>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	"arm@...nel.org" <arm@...nel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] char: tile-srom: Remove reference to platform_bus

On Tue, Aug 05, 2014 at 04:08:40PM -0400, Chris Metcalf wrote:
> On 8/1/2014 1:21 PM, Pawel Moll wrote:
> >On Thu, 2014-07-31 at 21:24 +0100, 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?
> >Theoretically speaking there shouldn't be any need to export the
> >platform bus root, as all devices should be registered via the platform
> >API (platform_device_register & co.)
> 
> So, perhaps the right fix is to just use platform_device_register()
> etc for this device, rather than making it virtual?

Sure, that's fine with me if you want to make it a platform device, but
note that a platform device doesn't have a minor associated with it, you
will have to still have your existing srom_class and the rest.  Right
now you aren't creating any real "devices" in the kernel, other than the
one you use for your minor number, which is not a "real" device.

struct srom_dev should be a platform device and then this will get
"easier" overall, sorry I missed that when the original code was
submitted.

thanks,

greg k-h
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