From: Stephen Warren <swarren@wwwdotorg.org>
To: Thierry Reding <thierry.reding@gmail.com>, Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
kgene.kim@samsung.com,
Shaik Ameer Basha <shaik.ameer@samsung.com>,
prathyush.k@samsung.com, grundler@chromium.org, joro@8bytes.org,
supash.ramaswamy@linaro.org, linux-kernel@vger.kernel.org,
pullip.cho@samsung.com, tomasz.figa@gmail.com,
sachin.kamat@linaro.org, iommu@lists.linux-foundation.org,
linux-samsung-soc@vger.kernel.org, s.nawrocki@samsung.com,
a.motakis@virtualopensystems.com, Varun.Sethi@freescale.com,
joshi@samsung.com, t.figa@samsung.com, rahul.sharma@samsung.com,
Hiroshi Doyu <hdoyu@nvidia.com>,
Will Deacon <will.deacon@arm.com>
Subject: Re: [PATCH v12 11/31] documentation: iommu: add binding document of Exynos System MMU
Date: Mon, 28 Apr 2014 11:52:24 -0600 [thread overview]
Message-ID: <535E9558.8010803@wwwdotorg.org> (raw)
In-Reply-To: <20140428111802.GI19455@ulmo>
On 04/28/2014 05:18 AM, Thierry Reding wrote:
> On Mon, Apr 28, 2014 at 12:56:03PM +0200, Arnd Bergmann wrote:
...
>> A lot of drivers probably only support one
>> master, so they can just set #iommu-cells=<0>, others might require
>> IDs that do not fit into one cell.
>
> You mean "#iommu-cells = <1>" for devices that only require one master?
> There still has to be one cell to specify which master. Unless perhaps
> if they can be arbitrarily assigned. I guess even if there's a fixed
> mapping that applies to one SoC generation, it might be good to still
> employ a specifier and have the mapping in DT for flexibility.
#iommu-cells doesn't include the phandle, so if you want the client
references to be:
property = <&iommu>;
then that's #iommu-cells=<0>, whereas:
property = <&iommu N>;
is #iommu-cells=<1>.
next prev parent reply other threads:[~2014-04-28 19:10 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-27 7:37 [PATCH v12 00/31] iommu/exynos: Fixes and Enhancements of System MMU driver with DT Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 01/31] iommu/exynos: do not include removed header Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 02/31] iommu/exynos: add missing cache flush for removed page table entries Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 03/31] iommu/exynos: change error handling when page table update is failed Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 04/31] iommu/exynos: fix L2TLB invalidation Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 05/31] iommu/exynos: remove prefetch buffer setting Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 06/31] iommu/exynos: allocate lv2 page table from own slab Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 07/31] iommu/exynos: always enable runtime PM Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 08/31] iommu/exynos: handle one instance of sysmmu with a device descriptor Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 09/31] iommu/exynos: remove dbgname from drvdata of a System MMU Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 10/31] iommu/exynos: use managed device helper functions Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 11/31] documentation: iommu: add binding document of Exynos System MMU Shaik Ameer Basha
2014-04-27 18:23 ` Arnd Bergmann
2014-04-28 10:39 ` Thierry Reding
2014-04-28 10:56 ` Arnd Bergmann
2014-04-28 11:18 ` Thierry Reding
2014-04-28 12:05 ` Arnd Bergmann
2014-04-28 12:49 ` Thierry Reding
2014-05-15 20:37 ` Thierry Reding
2014-05-16 0:39 ` Cho KyongHo
2014-04-28 17:52 ` Stephen Warren [this message]
2014-04-27 7:37 ` [PATCH v12 12/31] iommu/exynos: support for device tree Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 13/31] iommu/exynos: gating clocks of master H/W Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 14/31] iommu/exynos: remove custom fault handler Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 15/31] iommu/exynos: handle 'mmu-masters' property of DT and improve handling sysmmu Shaik Ameer Basha
2014-04-27 18:17 ` Arnd Bergmann
2014-05-01 14:08 ` Cho KyongHo
2014-04-27 7:37 ` [PATCH v12 16/31] iommu/exynos: turn on useful configuration options Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 17/31] iommu/exynos: add support for power management subsystems Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 18/31] iommu/exynos: allow having multiple System MMUs for a master H/W Shaik Ameer Basha
2014-04-28 10:38 ` Tushar Behera
2014-05-01 14:10 ` Cho KyongHo
2014-05-06 18:05 ` Tomasz Figa
2014-05-09 10:54 ` Cho KyongHo
2014-04-27 7:37 ` [PATCH v12 19/31] iommu/exynos: change rwlock to spinlock Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 20/31] iommu/exynos: add devices attached to the System MMU to an IOMMU group Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 21/31] iommu/exynos: fix address handling Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 22/31] iommu/exynos: use exynos-iommu specific typedef Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 23/31] iommu/exynos: use simpler function to get MMU version Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 24/31] iommu/exynos: apply workaround of caching fault page table entries Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 25/31] iommu/exynos: enhanced error messages Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 26/31] clk: exynos: add gate clock descriptions of System MMU Shaik Ameer Basha
2014-04-27 7:37 ` [PATCH v12 27/31] ARM: dts: add System MMU nodes of exynos4 series Shaik Ameer Basha
2014-04-27 7:38 ` [PATCH v12 28/31] ARM: dts: add System MMU nodes of exynos4210 Shaik Ameer Basha
2014-04-27 7:38 ` [PATCH v12 29/31] ARM: dts: add System MMU nodes of exynos4x12 Shaik Ameer Basha
2014-04-27 7:38 ` [PATCH v12 30/31] ARM: dts: add System MMU nodes of exynos5250 Shaik Ameer Basha
2014-04-27 17:39 ` Vikas Sajjan
2014-04-28 23:13 ` Doug Anderson
2014-05-01 14:16 ` Cho KyongHo
2014-04-27 7:38 ` [PATCH v12 31/31] ARM: dts: add System MMU nodes of exynos5420 Shaik Ameer Basha
2014-04-28 8:34 ` [PATCH v12 00/31] iommu/exynos: Fixes and Enhancements of System MMU driver with DT Arnd Bergmann
2014-04-30 4:50 ` Shaik Ameer Basha
2014-04-30 10:57 ` Shaik Ameer Basha
2014-05-06 17:59 ` Joerg Roedel
2014-05-06 18:08 ` Tomasz Figa
2014-05-07 0:44 ` Cho KyongHo
2014-05-06 18:21 ` Arnd Bergmann
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