linux-kernel - Re: [RFC/PATCH 7/9] iommu: of: Document the of_iommu

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Date:	Thu, 28 May 2015 14:02:39 +0100
From:	Will Deacon <will.deacon@....com>
To:	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	Laura Abbott <lauraa@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>,
	Mitchel Humpherys <mitchelh@...eaurora.org>,
	Joreg Roedel <joro@...tes.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Robin Murphy <Robin.Murphy@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [RFC/PATCH 7/9] iommu: of: Document the of_iommu_configure()
 function

On Fri, May 15, 2015 at 12:00:08AM +0100, Laurent Pinchart wrote:
> The function isn't trivial, document its behaviour.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> ---
>  drivers/iommu/of_iommu.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)

Thanks for doing this.

Acked-by: Will Deacon <will.deacon@....com>

Will

> diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
> index 43429ab62228..b922ed4f9fb3 100644
> --- a/drivers/iommu/of_iommu.c
> +++ b/drivers/iommu/of_iommu.c
> @@ -133,6 +133,19 @@ struct iommu_ops *of_iommu_get_ops(struct device_node *np)
>  	return ops;
>  }
>  
> +/**
> + * of_iommu_configure - Configure and return the IOMMU for a device
> + * @dev: device for which to configure the IOMMU
> + * @master_np: device node of the bus master connected to the IOMMU
> + *
> + * The master_np parameter specifies the device node of the bus master seen by
> + * the IOMMU. This is usually the device node of the dev device, but can be the
> + * device node of a bridge when the device is dynamically discovered and
> + * instantiated and thus has no device node (such as PCI devices for instance).
> + *
> + * Return a pointer to the iommu_ops for the device, NULL if the device isn't
> + * connected to an IOMMU, or a negative value if an error occurs.
> + */
>  struct iommu_ops *of_iommu_configure(struct device *dev,
>  				     struct device_node *master_np)
>  {
> -- 
> 2.3.6
> 
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