linux-kernel - Re: [PATCH] iommu/of: Only do IOMMU lookup for available ones

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Message-ID: <5A60B60F.6040602@rock-chips.com>
Date:   Thu, 18 Jan 2018 22:58:23 +0800
From:   JeffyChen <jeffy.chen@...k-chips.com>
To:     Will Deacon <will.deacon@....com>, Joerg Roedel <joro@...tes.org>
CC:     linux-kernel@...r.kernel.org, jcliang@...omium.org,
        tfiga@...omium.org, iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH] iommu/of: Only do IOMMU lookup for available ones

Hi Will,

Thanks for your reply.

On 01/18/2018 10:41 PM, Will Deacon wrote:
>> >
>> >Makes sense to me, but I'd like to have an OK from Robin or Will (added
>> >to Cc) before applying this.
> I don't think this patch makes a lot of sense in isolation: the SMMU drivers
> themselves will likely still probe, and it's unclear what we should about
> DMA when an IOMMU is not deemed to be available. See:
>
> https://patchwork.kernel.org/patch/9681211/
>
> Jeffy -- are you solving a real issue here, or is this just an attempt at
> some cleanup?

hmmm, it's just a cleanup, but it seems like we already removed this 
of_iommu_init_fn in:
b0c560f7d8a4 iommu: Clean up of_iommu_init_fn

so this patch can be disregarded too :)
>
> Will
>
>
>