linux-kernel - Re: [PATCH v9 07/16] iommu/exynos: support for device tree

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Date:	Fri, 09 Aug 2013 17:02:02 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Cho KyongHo <pullip.cho@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Joerg Roedel <joro@...tes.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Prathyush <prathyush.k@...sung.com>,
	Rahul Sharma <rahul.sharma@...sung.com>,
	Subash Patel <supash.ramaswamy@...aro.org>,
	Grant Grundler <grundler@...omium.org>,
	Antonios Motakis <a.motakis@...tualopensystems.com>,
	kvmarm@...ts.cs.columbia.edu,
	Sachin Kamat <sachin.kamat@...aro.org>
Subject: Re: [PATCH v9 07/16] iommu/exynos: support for device tree

On Friday 09 of August 2013 08:28:09 Rob Herring wrote:
> On Fri, Aug 9, 2013 at 1:37 AM, Cho KyongHo <pullip.cho@...sung.com> 
wrote:
> > On Fri, 09 Aug 2013 00:41:25 +0200, Tomasz Figa wrote:
> >> Hi KyongHo,
> >> 
> >> On Thursday 08 of August 2013 18:38:49 Cho KyongHo wrote:
> >> > This commit adds device tree support for System MMU.
> >> > This also include the following changes and enhancements:
> >> > 
> >> > * use managed device helper functions.
> >> > Simplyfies System MMU device driver.
> >> > 
> >> > * use only a single clock descriptor.
> >> > System MMU device descriptor is seperate if it is imposible to make
> >> > a single clock descriptor to make a device descriptor for a group of
> >> > System MMUs.
> >> > 
> >> > * removed dbgname member from sysmmu_drvdata structure.
> >> > debugging kernel message for a System MMU is distinguisheable with
> >> > the
> >> > name of device descroptors.
> >> 
> >> Please put all these three changes in separate patches. This patch is
> >> hard to review with all the changes mixed together...
> 
> Agreed.
> 
> > Ok.
> > 
> >> In addition, I believe this is the patch that should be adding device
> >> tree binding documentation, not the 6/16 one, as this is where
> >> actually support for this binding gets added to the kernel.
> > 
> > Oh, I didn't know that devicetree binding description and
> > implementation need to be in the same patch.
> > I will do as you advised.
> 
> Actually, I prefer the binding docs be separate patches. The reason
> being so we can get closer to having them in a separate repository.
> Also, then the binding can be acked separately from the kernel
> implementation using the binding.

OK. This is a good point. So maybe let's fully define this order to be as 
following (and have first best practice for the DT binding best practices 
that need to be defined):

Bindings documentation should be added with a separate patch, before any 
user of these bindings is introduced.

What do you think?

Best regards,
Tomasz

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