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

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Date:	Fri, 16 Mar 2012 13:47:50 -0700
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	Subash Patel <subash.ramaswamy@...aro.org>
CC:	Kukjin Kim <kgene.kim@...sung.com>,
	Joerg Roedel <joerg.roedel@....com>,
	Cho KyongHo <pullip.cho@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.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

Subash Patel wrote:
> Hi KyongHo, Kukjin,
>
> On 03/15/2012 08:09 PM, Kukjin Kim wrote:
>> On 03/15/12 04:12, Joerg Roedel wrote:
>>> On Thu, Mar 15, 2012 at 05:32:39PM +0900, Cho KyongHo wrote:
>>
>> KyongHo, I looked at 'Cho KyongHo <pullip.cho ...>' and 'KyongHo Cho
>> <pullip.cho ...>' in this series, which one do you want to use?
>>
>>>> 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.
>>>
>>
>> Yes, as KyoungHo said, this has been created on top of Samsung tree
>> for-next because this touches many exynos stuff which has been changed
>> from Samsung tree for upcoming merge window. So if you're ok on this,
>> 1st patch and this should be sent to upstream via samsung tree even
>> though I can't find any topic branch for this yet. And if you want
>> topic branch for your tree, let me know, I can provide it.
>>
>> Thanks.
> Wouldn't it be good to send exynos4 SYSMMU patches now, and send only
> the exynos5 delta when your for-next(exynos5) changes

Hmm, it can be a solution for this, but I'm not sure exynos4 and exynos5 
can be splitted.

> get merged to mainline? Manually editing the patches is really pain-some

YES, absolutely. Nobody like it.

> and sometimes error-some :( Can this patch in particular
> be split?

Hmm...

Now we don't have much time for upcoming merge window, and this should 
be in linux-next before open merge window.

Anyway Joerg, how do you want to handle this? Do you want to pick up 
1/2/3 all of them in your tree? If so, 2nd patch should be on top of 
some samsung topic stuff.

Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@...sung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.
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