From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dave.Martin@arm.com (Dave Martin)
Date: Fri, 6 Jun 2014 12:07:11 +0100
Subject: [PATCH RFC v1 1/2] documentation/iommu: Add description of
 Hisilicon System MMU binding
In-Reply-To: <8620067.9Lo76DOS52@wuerfel>
References: <1401975430-2648-1-git-send-email-thunder.leizhen@huawei.com>
 <1401975430-2648-2-git-send-email-thunder.leizhen@huawei.com>
 <8620067.9Lo76DOS52@wuerfel>
Message-ID: <20140606110652.GB4116@e103592.cambridge.arm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Fri, Jun 06, 2014 at 08:48:26AM +0200, Arnd Bergmann wrote:
> On Thursday 05 June 2014 21:37:09 Zhen Lei wrote:
> 
> > +- smmu-masters  : A list of phandles to device nodes representing bus
> > +                  masters for which the SMMU can provide a translation
> > +                  and their corresponding StreamIDs (see example below).
> > 
> 
> We're currently in the process of defining a generic binding for IOMMUs.
> 
> While the smmu-masters property was copied from an existing binding,
> I think we will end up migrating away from that towards a common way
> to express those things, and we shouldn't add another one doing this
> in a nonstandard way. Please have a look at the latest discussion
> about the iommu binding using #iommu-cells and a reference from the
> master to the iommu and see if you can migrate your code to use that.

Thanks for making this point -- I was going to do so yesterday but then
hesitated due to uncertainty about whether this should really be a new
driver.

Either way, it would be very valuable at least to attempt to describe
the Hisilicon SMMU implemenation using the new proposals, since that is
a good test of how reusable the proposed generic binding actually is.

Cheers
---Dave