linux-kernel - Re: [PATCH 2/2] iommu/omap: Add support to program multiple iommus

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Date:   Fri, 1 Sep 2017 18:33:12 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Suman Anna <s-anna@...com>
Cc:     iommu@...ts.linux-foundation.org, Tony Lindgren <tony@...mide.com>,
        Tero Kristo <t-kristo@...com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] iommu/omap: Add support to program multiple iommus

Hi Suman,
On Fri, Sep 01, 2017 at 11:21:45AM -0500, Suman Anna wrote:
> It's primarily a question of whether each iommu platform device need to
> be represented as a unique iommu_device or not. If you still think that
> both these need to be presented to iommu core as one device, I would
> have to add some glue logic in probe to tie the two devices together.

I think that you should only call iommu_device_register and friends for
the mmu-device you link the other devices against in .add_device.
Otherwise people will see two mmus in sysfs, one of them with no devices
behind it. That is inconsistent with the rest of the patch-set, which
basically handles bots mmus as one. But changing that should be easy, I
think.

Regards,

	Joerg