The IOMMU has registers in the infracfg and/or pericfg iospaces: as
for the currently supported SoCs, MT2712 and MT8173 need a phandle to
infracfg, while MT8195 needs one to pericfg.

Before this change, the driver was checking for a SoC-specific infra/peri
compatible but, sooner or later, these lists are going to grow a lot...
...and this is why it was chosen to add phandles (as it was done with
some other drivers already - look at mtk-pm-domains, mt8192-afe

Please note that, while it was necessary to update the devicetrees for
MT8173 and MT2712e, there was no update for MT8195 because there is no
IOMMU node in there yet.

Changes in v3:
 - Different squashing of dt-bindings patches (sorry for misunderstanding!)
 - Removed legacy devicetree print

Changes in v2:
 - Squashed dt-bindings patches as suggested by Matthias
 - Removed quotes from infra/peri phandle refs
 - Changed dev_warn to dev_info in patches [2/7], [3/7]

AngeloGioacchino Del Regno (6):
  dt-bindings: iommu: mediatek: Add mediatek,infracfg phandle
  iommu: mtk_iommu: Lookup phandle to retrieve syscon to infracfg
  arm64: dts: mediatek: mt8173: Add mediatek,infracfg phandle for IOMMU
  arm64: dts: mediatek: mt2712e: Add mediatek,infracfg phandle for IOMMU
  dt-bindings: iommu: mediatek: Add mediatek,pericfg phandle
  iommu: mtk_iommu: Lookup phandle to retrieve syscon to pericfg

 .../bindings/iommu/mediatek,iommu.yaml        | 30 +++++++++
 arch/arm64/boot/dts/mediatek/mt2712e.dtsi     |  2 +
 arch/arm64/boot/dts/mediatek/mt8173.dtsi      |  1 +
 drivers/iommu/mtk_iommu.c                     | 61 +++++++++++--------
 4 files changed, 70 insertions(+), 24 deletions(-)


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