linux-kernel - Re: [PATCH v6 00/12] iommu/exynos: Fixes and Enhancements of System MMU driver with DT

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Message-ID: <CAHQjnOMonei8ZS+wKhv4REXq_dpXPdnGrdKEfkdJ+J7QF7kf8w@mail.gmail.com>
Date:	Thu, 17 Jan 2013 02:00:03 +0900
From:	KyongHo Cho <pullip.cho@...sung.com>
To:	Will Deacon <will.deacon@....com>
Cc:	Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Hyunwoong Kim <khw0178.kim@...sung.com>,
	Prathyush <prathyush.k@...sung.com>,
	Joerg Roedel <joro@...tes.org>,
	Subash Patel <supash.ramaswamy@...aro.org>,
	Rahul Sharma <rahul.sharma@...sung.com>
Subject: Re: [PATCH v6 00/12] iommu/exynos: Fixes and Enhancements of System
 MMU driver with DT

On Wed, Jan 16, 2013 at 7:53 PM, Will Deacon <will.deacon@....com> wrote:
> On Wed, Dec 26, 2012 at 01:53:15AM +0000, Cho KyongHo wrote:
>> notice: v6 patch-set is rebased on next/iommu-exynos branch of
>> linux-samsung.git.  This patch-set does not include 2 patches (05 and 06
>> patches in v5 patch-se) because they alread exist already in the branch.
>
> Given that devicetree-discuss has been notably absent from discussion
> surrounding the proposed binding, I think that including that patch in
> linux-samsung.git and dropping it from this series is rather premature.
>
> I have comments on the binding, so I'll dig up the version you posted in v5
> and add devicetree-discuss to CC.

Thank you.

>> The current exynos-iommu(System MMU) driver does not work autonomously
>> since it is lack of support for power management of peripheral blocks.
>> For example, MFC device driver must ensure that its System MMU is disabled
>> before MFC block is power-down not to invalidate IOTLB in the System MMU
>> when I/O memory mapping is changed. Because A System MMU is resides in the
>> same H/W block, access to control registers of System MMU while the H/W
>> block is turned off must be prohibited.
>>
>> This set of changes solves the above problem with setting each System MMUs
>> as the parent of the device which owns the System MMU to recieve the
>> information when the device is turned off or turned on.
>>
>> Another big change to the driver is the support for devicetree.
>> The bindings for System MMU is described in
>> Documentation/devicetree/bindings/arm/samsung/system-mmu.txt
>
> This should probably be Documentation/devicetree/bindings/iommu/ no?

Please let me check it.

Thank you.

KyongHo.
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