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SubjectRe: [PATCH 3/3] iommu/tegra-smmu: Allow to group clients in same swgroup
On Fri, Sep 11, 2020 at 12:16:43AM -0700, Nicolin Chen wrote:
> There can be clients using the same swgroup in DT, for example i2c0
> and i2c1. The current driver will add them to separate IOMMU groups,
> though it has implemented device_group() callback which is to group
> devices using different swgroups like DC and DCB.
> All clients having the same swgroup should be also added to the same
> IOMMU group so as to share an asid. Otherwise, the asid register may
> get overwritten every time a new device is attached.
> Signed-off-by: Nicolin Chen <>
> ---
> drivers/iommu/tegra-smmu.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)

Makes sense:

Acked-by: Thierry Reding <>
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