linux-kernel - Re: [PATCH v11 13/27] iommu/exynos: support for device tree

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Message-id: <20140318201424.e8bde8514726c3639243e9ad@samsung.com>
Date:	Tue, 18 Mar 2014 20:14:24 +0900
From:	Cho KyongHo <pullip.cho@...sung.com>
To:	Sachin Kamat <sachin.kamat@...aro.org>
Cc:	Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
	Linux DeviceTree <devicetree@...r.kernel.org>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
	Antonios Motakis <a.motakis@...tualopensystems.com>,
	Grant Grundler <grundler@...omium.org>,
	Joerg Roedel <joro@...tes.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Prathyush <prathyush.k@...sung.com>,
	Rahul Sharma <rahul.sharma@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomasz Figa <t.figa@...sung.com>,
	Varun Sethi <Varun.Sethi@...escale.com>
Subject: Re: [PATCH v11 13/27] iommu/exynos: support for device tree

On Fri, 14 Mar 2014 20:57:42 +0530, Sachin Kamat wrote:
> Hi KyongHo,
> 
> On 14 March 2014 10:39, Cho KyongHo <pullip.cho@...sung.com> wrote:
> > This commit adds device tree support for System MMU.
> >
> > Signed-off-by: Cho KyongHo <pullip.cho@...sung.com>
> > ---
> >  drivers/iommu/Kconfig        |    5 ++---
> >  drivers/iommu/exynos-iommu.c |   21 +++++++++++++++++----
> >  2 files changed, 19 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> > index df56e4c..22af807 100644
> > --- a/drivers/iommu/Kconfig
> > +++ b/drivers/iommu/Kconfig
> > @@ -178,16 +178,15 @@ config TEGRA_IOMMU_SMMU
> >
> >  config EXYNOS_IOMMU
> >         bool "Exynos IOMMU Support"
> > -       depends on ARCH_EXYNOS && EXYNOS_DEV_SYSMMU
> > +       depends on ARCH_EXYNOS
> >         select IOMMU_API
> > +       default n
> 
> This is not needed as it is the default choice.
> 

OK.

> >         help
> >           Support for the IOMMU(System MMU) of Samsung Exynos application
> >           processor family. This enables H/W multimedia accellerators to see
> >           non-linear physical memory chunks as a linear memory in their
> >           address spaces
> >
> > -         If unsure, say N here.
> > -
> >  config EXYNOS_IOMMU_DEBUG
> >         bool "Debugging log for Exynos IOMMU"
> >         depends on EXYNOS_IOMMU
> > diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> > index 33b424d..34feb04 100644
> > --- a/drivers/iommu/exynos-iommu.c
> > +++ b/drivers/iommu/exynos-iommu.c
> > @@ -26,6 +26,7 @@
> >  #include <linux/list.h>
> >  #include <linux/memblock.h>
> >  #include <linux/export.h>
> > +#include <linux/of.h>
> >
> >  #include <asm/cacheflush.h>
> >  #include <asm/pgtable.h>
> > @@ -497,7 +498,7 @@ void exynos_sysmmu_tlb_invalidate(struct device *dev)
> >         read_unlock_irqrestore(&data->lock, flags);
> >  }
> >
> > -static int exynos_sysmmu_probe(struct platform_device *pdev)
> > +static int __init exynos_sysmmu_probe(struct platform_device *pdev)
> >  {
> >         int irq, ret;
> >         struct device *dev = &pdev->dev;
> > @@ -557,11 +558,23 @@ static int exynos_sysmmu_probe(struct platform_device *pdev)
> >         return 0;
> >  }
> >
> > -static struct platform_driver exynos_sysmmu_driver = {
> > -       .probe          = exynos_sysmmu_probe,
> > -       .driver         = {
> > +#ifdef CONFIG_OF
> 
> This is not needed as Exynos is DT only platform.
> 
Yes, but I hesitate to remove that.

> > +static struct of_device_id sysmmu_of_match[] __initconst = {
> > +       { .compatible   = "samsung,sysmmu-v1", },
> > +       { .compatible   = "samsung,sysmmu-v2", },
> > +       { .compatible   = "samsung,sysmmu-v3.1", },
> > +       { .compatible   = "samsung,sysmmu-v3.2", },
> > +       { .compatible   = "samsung,sysmmu-v3.3", },
> > +       { },
> > +};
> > +#endif
> > +
> > +static struct platform_driver exynos_sysmmu_driver __refdata = {
> > +       .probe  = exynos_sysmmu_probe,
> > +       .driver = {
> >                 .owner          = THIS_MODULE,
> >                 .name           = "exynos-sysmmu",
> > +               .of_match_table = of_match_ptr(sysmmu_of_match),
> 
> of_match_ptr is not needed for the same reason as above.
> 
Ditto.

Thanks.

KyongHo
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