linux-kernel - Re: [PATCH 2/2] ARM: imx: convert camera init to use platform_device_register

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Message-ID: <20140522103240.GB4804@lianli>
Date:	Thu, 22 May 2014 12:32:40 +0200
From:	Emil Goode <emilgoode@...il.com>
To:	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:	Shawn Guo <shawn.guo@...escale.com>, kernel@...gutronix.de,
	Russell King <linux@....linux.org.uk>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH 2/2] ARM: imx: convert camera init to use
 platform_device_register_full()

Hello Uwe,

On Mon, May 19, 2014 at 08:27:22AM +0200, Uwe Kleine-König wrote:
> Hello Emil,
> 
> thanks for your effort.
> 
> On Sun, May 18, 2014 at 10:51:00PM +0200, Emil Goode wrote:
> > This converts the imx camera allocation and initialization functions
> > to use platform_device_register_full() thus simplifying the code.
> > 
> > Signed-off-by: Emil Goode <emilgoode@...il.com>
> > ---
> > Only build tested, unfortunately I currently don't have the hardware.
> > 
> >  arch/arm/mach-imx/devices/platform-ipu-core.c |   43 +++++++++----------------
> >  arch/arm/mach-imx/mach-mx31_3ds.c             |    5 ++-
> >  arch/arm/mach-imx/mach-mx31moboard.c          |    6 ++--
> >  arch/arm/mach-imx/mach-mx35_3ds.c             |    5 ++-
> >  arch/arm/mach-imx/mach-pcm037.c               |    5 ++-
> >  5 files changed, 23 insertions(+), 41 deletions(-)
> > 
> > diff --git a/arch/arm/mach-imx/devices/platform-ipu-core.c b/arch/arm/mach-imx/devices/platform-ipu-core.c
> > index 6bd7c3f..13ea542 100644
> > --- a/arch/arm/mach-imx/devices/platform-ipu-core.c
> > +++ b/arch/arm/mach-imx/devices/platform-ipu-core.c
> > @@ -69,42 +69,29 @@ struct platform_device *__init imx_alloc_mx3_camera(
> IMHO you should better rename the function because now it doesn't only
> allocate the device, but also registers it.
> 
> Also I doubt that it's OK to call dma_declare_coherent_memory after the
> device is added. In this case maybe extend
> platform_device_register_full? And also add a warning to
> dma_declare_coherent_memory if it is called for an already added device?
> (Added a few people to Cc: that might be able to comment this. I don't
> even know if there is a reliable way to check if a device is already
> added.)

According to the documentation dma_declare_coherent_memory() is only used
in unlikely corner cases, so I concluded that it is probably better not to
include it in platform_device_register_full().

Best regards,

Emil Goode
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