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Date:   Fri, 20 Nov 2020 17:23:15 +0100
From:   Thierry Reding <>
To:     Nicolin Chen <>
Subject: Re: [PATCH RESEND 3/5] iommu/tegra-smmu: Use fwspec in

On Wed, Nov 11, 2020 at 02:21:27PM -0800, Nicolin Chen wrote:
> In tegra_smmu_(de)attach_dev() functions, we poll DTB for each
> client's iommus property to get swgroup ID in order to prepare
> "as" and enable smmu. Actually tegra_smmu_configure() prepared
> an fwspec for each client, and added to the fwspec all swgroup
> IDs of client DT node in DTB.
> So this patch uses fwspec in tegra_smmu_(de)attach_dev() so as
> to replace the redundant DT polling code.
> Reviewed-by: Dmitry Osipenko <>
> Tested-by: Dmitry Osipenko <>
> Signed-off-by: Nicolin Chen <>
> ---
>  drivers/iommu/tegra-smmu.c | 56 ++++++++++++++++----------------------
>  1 file changed, 23 insertions(+), 33 deletions(-)

Acked-by: Thierry Reding <>

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