linux-kernel - Re: [PATCH v12 2/3] ARM: EXYNOS: Change System MMU platform device definitions

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Date:	Thu, 15 Mar 2012 12:12:27 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Cho KyongHo <pullip.cho@...sung.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-samsung-soc@...r.kernel.org>,
	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Subash Patel' <subash.ramaswamy@...aro.org>,
	'Younglak Kim' <younglak1004.kim@...sung.com>,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	'Sanghyun Lee' <sanghyun75.lee@...sung.com>
Subject: Re: [PATCH v12 2/3] ARM: EXYNOS: Change System MMU platform device
 definitions

On Thu, Mar 15, 2012 at 05:32:39PM +0900, Cho KyongHo wrote:
> Handling System MMUs with an identifier is not flexible to manage
> System MMU platform devices because of the following reasons:
> 1. A device driver which needs to handle System MMU must know the ID.
> 2. A System MMU may not present in some implementations of Exynos family.
> 3. Handling System MMU with IOMMU API does not require an ID.
> 
> This patch is the result of removing ID of System MMUs.
> Instead, a device driver that needs to handle its System MMU must
> use IOMMU API while its descriptor of platform device is given.
> 
> This patch also includes the following enhancements:
> - A System MMU device becomes a child if its power domain device.
> - clkdev
> 
> Cc: Kukjin Kim <kgene.kim@...sung.com>
> Signed-off-by: KyongHo Cho <pullip.cho@...sung.com>
> ---
>  arch/arm/mach-exynos/Kconfig                    |   10 +-
>  arch/arm/mach-exynos/Makefile                   |    2 +-
>  arch/arm/mach-exynos/clock-exynos4.c            |   79 ++--
>  arch/arm/mach-exynos/clock-exynos4.h            |    2 +
>  arch/arm/mach-exynos/clock-exynos4210.c         |   11 +
>  arch/arm/mach-exynos/clock-exynos4212.c         |   28 ++-
>  arch/arm/mach-exynos/clock-exynos5.c            |   90 +++++
>  arch/arm/mach-exynos/dev-sysmmu.c               |  457 ++++++++++++----------
>  arch/arm/mach-exynos/include/mach/irqs.h        |   25 +-
>  arch/arm/mach-exynos/include/mach/map.h         |   38 ++
>  arch/arm/mach-exynos/include/mach/regs-clock.h  |    5 +
>  arch/arm/mach-exynos/include/mach/regs-sysmmu.h |   28 --
>  arch/arm/mach-exynos/include/mach/sysmmu.h      |   88 +++--
>  arch/arm/mach-exynos/mach-armlex4210.c          |    1 -
>  arch/arm/mach-exynos/mach-smdkv310.c            |    1 -
>  15 files changed, 529 insertions(+), 336 deletions(-)
>  delete mode 100644 arch/arm/mach-exynos/include/mach/regs-sysmmu.h

This patch doesn't apply cleanly against upstream Linux (v3.3-rcX).
Please rebase to upstream and resend. The other 2 patches apply fine.


	Joerg

-- 
AMD Operating System Research Center

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo
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