linux-kernel - Re: [PATCH] drivers/tty: Folding Android's keyreset driver in sysRQ

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Message-ID: <20121005190819.GB24356@core.coreip.homeip.net>
Date:	Fri, 5 Oct 2012 12:08:19 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	mathieu.poirier@...aro.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, rdunlap@...otime.net,
	arve@...roid.com, kernel-team@...roid.com, john.stultz@...aro.org
Subject: Re: [PATCH] drivers/tty: Folding Android's keyreset driver in sysRQ

On Fri, Oct 05, 2012 at 07:53:03PM +0100, Alan Cox wrote:
> > I have the same objection as before: using platform device solely for
> > the purpose of passing some data from board code to the driver. Surely
> > there are other ways of passing this bit of data... What about, for
> > example, making it an empty weak symbol so that board code could
> > override it with strong one?
> 
> I have the same objection to it being passed in other weird ways. This is
> cross architecture, cross device stuff. Magic architecture goo and weak
> symbols are not the right solution.

The right solution is module option + DT. However they want to have
compatibility for older boards. For that I think weak symbol is just
fine.

> 
> The reset switch is a device, physically and logically.

Except that this one isn't. It is a magic sequence of key presses done
on a physical device that is already registered with the kernel. We do
not register SysRQ itself as a separate device, we do not register Mac
button mangler as a separate device, and I do not see the reason here
either.

Thanks.

-- 
Dmitry
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