From: Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Cc: Andreas Herrmann
<andreas.herrmann-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>,
"devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org"
<devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>,
"iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: [PATCH] documentation: iommu: add description of ARM System MMU binding
Date: Fri, 05 Apr 2013 13:25:26 -0500 [thread overview]
Message-ID: <515F1716.70309@gmail.com> (raw)
In-Reply-To: <20130405165745.GB17151-MRww78TxoiP5vMa5CHWGZ34zcgK1vI+I0E9HWUfgJXw@public.gmane.org>
On 04/05/2013 11:57 AM, Will Deacon wrote:
> Hi Rob,
>
> On Fri, Apr 05, 2013 at 05:43:06PM +0100, Rob Herring wrote:
[...]
>>> +- compatible : Should be one of "arm,smmu-v1" or "arm,smmu-v2"
>>> + depending on the version of the architecture
>>> + implemented.
>>
>> We can keep these, but we should have specific models like arm,smmu-400,
>> etc. as well.
>
> Ok, if distinctions need to be between MMU-400 and a v1 implementation, then
> we can add those strings later.
No, you want to have specific values in the dtb's up front. If there is
something needed later in the kernel, you don't want to require a dtb
update then. Adding future parts later is fine, but we already know what
blocks we have.
Rob
WARNING: multiple messages have this Message-ID (diff)
From: robherring2@gmail.com (Rob Herring)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] documentation: iommu: add description of ARM System MMU binding
Date: Fri, 05 Apr 2013 13:25:26 -0500 [thread overview]
Message-ID: <515F1716.70309@gmail.com> (raw)
In-Reply-To: <20130405165745.GB17151@mudshark.cambridge.arm.com>
On 04/05/2013 11:57 AM, Will Deacon wrote:
> Hi Rob,
>
> On Fri, Apr 05, 2013 at 05:43:06PM +0100, Rob Herring wrote:
[...]
>>> +- compatible : Should be one of "arm,smmu-v1" or "arm,smmu-v2"
>>> + depending on the version of the architecture
>>> + implemented.
>>
>> We can keep these, but we should have specific models like arm,smmu-400,
>> etc. as well.
>
> Ok, if distinctions need to be between MMU-400 and a v1 implementation, then
> we can add those strings later.
No, you want to have specific values in the dtb's up front. If there is
something needed later in the kernel, you don't want to require a dtb
update then. Adding future parts later is fine, but we already know what
blocks we have.
Rob
next prev parent reply other threads:[~2013-04-05 18:25 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-04 16:50 [PATCH] documentation: iommu: add description of ARM System MMU binding Will Deacon
2013-04-04 16:50 ` Will Deacon
2013-04-05 16:43 ` Rob Herring
2013-04-05 16:43 ` Rob Herring
2013-04-05 16:57 ` Will Deacon
2013-04-05 16:57 ` Will Deacon
[not found] ` <20130405165745.GB17151-MRww78TxoiP5vMa5CHWGZ34zcgK1vI+I0E9HWUfgJXw@public.gmane.org>
2013-04-05 18:25 ` Rob Herring [this message]
2013-04-05 18:25 ` Rob Herring
[not found] ` <515F1716.70309-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-04-08 8:59 ` Will Deacon
2013-04-08 8:59 ` Will Deacon
2013-04-05 20:44 ` Olav Haugan
2013-04-05 20:44 ` Olav Haugan
[not found] ` <515F37C1.4000109-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2013-04-08 9:25 ` Will Deacon
2013-04-08 9:25 ` Will Deacon
[not found] ` <20130408092535.GA17476-MRww78TxoiP5vMa5CHWGZ34zcgK1vI+I0E9HWUfgJXw@public.gmane.org>
2013-04-08 17:03 ` Olav Haugan
2013-04-08 17:03 ` Olav Haugan
[not found] ` <5162F87A.7070409-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2013-04-10 17:37 ` Will Deacon
2013-04-10 17:37 ` Will Deacon
[not found] ` <20130410173732.GQ26992-MRww78TxoiP5vMa5CHWGZ34zcgK1vI+I0E9HWUfgJXw@public.gmane.org>
2013-04-13 21:02 ` Olav Haugan
2013-04-13 21:02 ` Olav Haugan
[not found] ` <5169C7D1.8070300-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2013-04-15 13:13 ` Will Deacon
2013-04-15 13:13 ` Will Deacon
2013-04-16 18:18 ` Olav Haugan
2013-04-16 18:18 ` Olav Haugan
[not found] ` <516D9602.2010404-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2013-04-18 19:01 ` Will Deacon
2013-04-18 19:01 ` Will Deacon
2013-04-23 22:54 ` Olav Haugan
2013-04-23 22:54 ` Olav Haugan
[not found] ` <5177113D.7060300-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2013-04-24 9:55 ` Will Deacon
2013-04-24 9:55 ` Will Deacon
2013-05-07 20:26 ` Olav Haugan
2013-05-07 20:26 ` Olav Haugan
2013-05-13 9:07 ` Andreas Herrmann
2013-05-13 9:07 ` Andreas Herrmann
2013-05-13 10:04 ` Will Deacon
2013-05-13 10:04 ` Will Deacon
2013-07-08 16:20 ` Olav Haugan
2013-07-08 16:20 ` Olav Haugan
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