linux-kernel - Re: [PATCHv7 06/12] ARM: tegra: create a DT header defining SWGROUP ID

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Date:	Fri, 20 Dec 2013 13:35:55 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Mark Zhang <nvmarkzhang@...il.com>,
	Hiroshi Doyu <hdoyu@...dia.com>, swarren@...dia.com,
	will.deacon@....com, grant.likely@...aro.org,
	robherring2@...il.com, joro@...tes.org, mark.rutland@....com,
	devicetree@...r.kernel.org, lorenzo.pieralisi@....com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	galak@...eaurora.org, linux-tegra@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv7 06/12] ARM: tegra: create a DT header defining SWGROUP
 ID

On Wed, Dec 18, 2013 at 09:27:29AM -0700, Stephen Warren wrote:
> On 12/18/2013 01:02 AM, Mark Zhang wrote:
> > On 12/12/2013 03:57 PM, Hiroshi Doyu wrote:
> >> Create a header file to define the swgroup IDs used by the IOMMU(SMMU)
> >> binding. "swgroup" is a group of H/W clients which a Tegra SoC
> >> supports. This unique ID can be used to calculate MC_SMMU_<swgroup
> >> name>_ASID_0 register offset and MC_<swgroup name>_HOTRESET_*_0
> >> register bit. This will allow the same header to be used by both
> >> device tree files, and drivers implementing this binding, which
> >> guarantees that the two stay in sync. This also makes device trees
> >> more readable by using names instead of magic numbers. For HOTRESET
> >> bit shifting we need another conversion table, which will come later.
> 
> >> diff --git a/include/dt-bindings/memory/tegra-swgroup.h b/include/dt-bindings/memory/tegra-swgroup.h
> 
> >> +#define TEGRA_SWGROUP_MPE	11	/* 0x264 */
> >> +#define TEGRA_SWGROUP_MSENC	SWGROUP_MPE
> > 
> > Need to change this to:
> > 
> > #define TEGRA_SWGROUP_MSENC	11
> > 
> > The reason is that, this makes "TEGRA_SWGROUP_BIT" doesn't work. So if I
> > write "TEGRA_SWGROUP_CELLS(MSENC)" in dt, that causes a dt compiling error.
> 
> I guess it's because TEGRA_SWGROUP_BIT needs to expand its argument
> twice, which can be done.
> 
> That all said, just defining all the names directly to constants is
> probably the most direct fix.

Erm... isn't this simply a typo, where:

	#define TEGRA_SWGROUP_MSENC	SWGROUP_MPE

should simply be

	#define TEGRA_SWGROUP_MSENC	TEGRA_SWGROUP_MPE

?

That certainly works for me.

Thierry

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