linux-kernel - Re: [PATCH v8 0/2] ommu/exynos: Add IOMMU/System MMU driver for Samsung Exynos

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Date:	Tue, 28 Feb 2012 01:04:25 +0900
From:	KyongHo Cho <pullip.cho@...sung.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	Kukjin Kim <kgene.kim@...sung.com>,
	Subash Patel <subash.ramaswamy@...aro.org>,
	linux-kernel@...r.kernel.org,
	Younglak Kim <younglak1004.kim@...sung.com>,
	iommu@...ts.linux-foundation.org,
	linux-samsung-soc@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Sanghyun Lee <sanghyun75.lee@...sung.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 0/2] ommu/exynos: Add IOMMU/System MMU driver for
 Samsung Exynos

On Tue, Feb 28, 2012 at 12:51 AM, Marek Szyprowski
<m.szyprowski@...sung.com> wrote:

>> The next patch will be submitted by 2/28.
>
> Ok, I will check it soon then.

Thank you a lot.

>> The next IOMMU driver defines just one platform device for a H/W device.
>> Thus, it defines just one SYSMMU_MFC platform device, for example.
>> (the previous one defines 2 platform devices for SYSMMU_MFC)
>
> Exynos4210 has 2 iommu controllers for MFC device - one for each memory bus.
> Each MFC bus can address 128MiB of IO address space. Do you mean that the new driver
> will merge these 2 controllers into one? This way we will lose half of address space
> for MFC device.

The situation seems somewhat different from our use of MFC. I also
heard from Jungtae Park
that it is better to define separate platform devices for the system
MMUs of MFC.

Regards,

Cho KyongHo.
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