linux-kernel - Re: [PATCH 1/1] Driver for the Atmel on-chip SSC on AT32AP and AT91.

Open Source and information security mailing list archives

Date:	Thu, 19 Jul 2007 11:31:36 +0200
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	Haavard Skinnemoen <hskinnemoen@...el.com>
Cc:	Hans-Christian Egtvedt <hcegtvedt@...el.com>,
	David Brownell <david-b@...bell.net>,
	Andrew Victor <andrew@...people.com>,
	kernel-avr32 <kernel@...32linux.org>,
	Patrice Vilchez <patrice.vilchez@....atmel.com>,
	Nicolas FERRE <nicolas.ferre@....atmel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] Driver for the Atmel on-chip SSC on AT32AP and
 AT91.

Whoops, didn't notice that Andrew and LKML fell off Cc. Sorry.

Håvard

On Thu, 19 Jul 2007 11:01:22 +0200
Haavard Skinnemoen <hskinnemoen@...el.com> wrote:

> On Thu, 19 Jul 2007 08:53:44 +0200
> Hans-Christian Egtvedt <hcegtvedt@...el.com> wrote:
> 
> > >> +EXPORT_SYMBOL(ssc_request);
> > >>       
> > >
> > > All exports need justification, please.  An additional paragraph in the
> > > changelog would suit.
> > >     
> > How are exports justified? Can they be removed since the user have to 
> > include <linux/atmel-ssc.h> anyway?
> 
> No, we do need these since modules are going to link to them.
> 
> The idea is that other drivers call these functions to obtain a
> reference to one of the SSC instances in the system. Such drivers
> typically implement some sort of serial frame-based protocol, e.g. i2s,
> by programming the SSC controller directly. This driver is out of the
> way after a protocol driver has successfully requested an instance.
> 
> So the protocol drivers need some kind of resource management in order
> to not step on each others' toes, and that's the reason for the export
> of ssc_request() and ssc_free().
> 
> I'm not sure if anyone would have been very mad at me for sneaking this
> in through the avr32 tree, but I'd really like to know what others, in
> particular the AT91 people and David, think of this kind of thing
> before it ends up in mainline.
> 
> Feel free to add
> 
> Acked-by: Haavard Skinnemoen <hskinnemoen@...el.com>
> 
> to both patches (the driver and the fix) though. It's been through a
> few rounds of internal review.
> 
> Håvard
> _______________________________________________
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> Kernel@...32linux.org
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