RE: [PATCH v1 3/3] ARM:OMAP4 iommu:provide build support for omap4 iommu

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Russell,

Thanks for your comments.

Thank you,
Best regards,
Hari

> -----Original Message-----
> From: Russell King - ARM Linux [mailto:linux@xxxxxxxxxxxxxxxx]
> Sent: Wednesday, August 05, 2009 3:23 PM
> To: Kanigeri, Hari
> Cc: Hiroshi DOYU; linux-omap@xxxxxxxxxxxxxxx; tony@xxxxxxxxxxx; Shilimkar,
> Santosh
> Subject: Re: [PATCH v1 3/3] ARM:OMAP4 iommu:provide build support for
> omap4 iommu
> 
> On Wed, Aug 05, 2009 at 11:44:53AM -0500, Kanigeri, Hari wrote:
> > -- I agree with your comments from OMAP3 point of view.
> > For OMAP4, I guess Camera is not going to use IOMMU module. IOMMU
> > modules will be used only by the IPC that are communicating with 2
> > remote Cores (Ducati and Tesla).
> 
> In which case what you do is:
> 
> config OMAP_CAMERA
> 	...
> 	select OMAP_IOMMU if ARCH_OMAP3
> 
> which means the IOMMU support will only be built if the camera is enabled
> and we're building for OMAP3.
> 
> However, if the OMAP3 hardware uses the IOMMU but the OMAP4 hardware
> doesn't, I'd hazard a guess (and it's only a guess) that the drivers
> will be soo different that squeezing them into one file/config option
> would be silly.
> 
> > Having said this, there might not
> > be any clients of IOMMU in the Kernel space as we are looking at
> > the option of using the IOMMU as a character driver from User-space.
> > For this reason, I think we should have the configuration option to
> > build iommu. Please let me know your comments.
> 
> In which case, the IOMMU character driver can select the core IOMMU
> support.
> 
> Making symbols which are 'selected' visible causes problems - you
> can't disable them and you can't work out why they're being
> forcefully enabled, which just annoys people who are trying to
> configure the kernel.

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