[PATCHv4 1/3] mx2_camera: Add soc_camera support for i.MX25/i.MX27

[Uwe Kleine-König]

Hello,

On Wed, Jun 30, 2010 at 11:08:41AM +0200, Guennadi Liakhovetski wrote:
> Mauro, there's a question for you below.
> 
> On Wed, 30 Jun 2010, Uwe Kleine-König wrote:
> 
> > Hi Guennadi,
> > 
> > On Wed, Jun 30, 2010 at 09:20:36AM +0200, Guennadi Liakhovetski wrote:
> > > > > --- a/arch/arm/plat-mxc/include/mach/memory.h
> > > > > +++ b/arch/arm/plat-mxc/include/mach/memory.h
> > > > > @@ -44,12 +44,12 @@
> > > > >   */
> > > > >  #define CONSISTENT_DMA_SIZE SZ_8M
> > > > >  
> > > > > -#elif defined(CONFIG_MX1_VIDEO)
> > > > > +#elif defined(CONFIG_MX1_VIDEO) || defined(CONFIG_MX2_VIDEO)
> > > > >  /*
> > > > >   * Increase size of DMA-consistent memory region.
> > > > >   * This is required for i.MX camera driver to capture at least four VGA frames.
> > > > >   */
> > > > >  #define CONSISTENT_DMA_SIZE SZ_4M
> > > > > -#endif /* CONFIG_MX1_VIDEO */
> > > > > +#endif /* CONFIG_MX1_VIDEO || CONFIG_MX2_VIDEO */
> > > > Why not use CONFIG_VIDEO_MX2 here and get rid of CONFIG_MX2_VIDEO?
> > > 
> > > Well, firstly for uniformity with MX1 and MX3,
> > Using a common scheme for names on all platforms is fine, but if the
> > existing names are bad better establish a nicer scheme.
> > 
> > >                                                secondly not to have to use 
> > > (CONFIG_VIDEO_MX2 || CONFIG_VIDEO_MX2_MODULE),
> > ah, didn't notice that MX?_VIDEO is bool while VIDEO_MX? is tristate.
> > That's fine.  Still I would prefer a better naming that doesn't force
> > having to look up which variable is for the driver and which is for the
> > arch stuff.
> > 
> > >                                                also note, that 
> > > CONFIG_MX1_VIDEO is also used for linking of the FIQ handler for the camera.
> > This is just a matter of fixing the corresponding Makefile.
> 
> So, you call a change like
> 
>  # Support for CMOS sensor interface
> -obj-$(CONFIG_MX1_VIDEO)	+= ksym_mx1.o mx1_camera_fiq.o
> +ifneq ($(CONFIG_VIDEO_MX1),)
> +obj-y				+= ksym_mx1.o mx1_camera_fiq.o
> +endif
No, I'd do something like

	config VIDEO_MX1_HOSTSUPPORT
		bool

	config VIDEO_MX1
		tristate ...
		selects VIDEO_MX1_HOSTSUPPORT
 
I'm not entirely happy with "...HOSTSUPPORT" but it's better than
MX1_VIDEO.

Best regards
Uwe

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Pengutronix e.K.                           | Uwe Kleine-König            |
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