[PATCH v4 0/6] Add support for Qualcomm's legacy IOMMU v2

[AngeloGioacchino Del Regno]

This series adds support for handling "v2" firmware's IOMMU, found
on at least MSM8956 and MSM8976 (some other SoCs also need the same
but I honestly don't remember which ones precisely).

This is strictly required to get functional IOMMUs on these SoCs.

I'm sorry for not performing a much needed schema conversion on
qcom,iommu.txt, but I really didn't have time to do that :-(

This series was tested on Sony Xperia X and X Compact (MSM8956):
ADSP, LPASS, Venus, MSS, MDP and GPU are happy :-)

Changes in v4:
 - Rebase over next-20230619
 - Rewrite qcom,iommu.txt changes to qcom,iommu.yaml
 - Changed reset writes to only disable CB through CB_SCTLR
   and reset CB_FSR and CB_FAR
 - Addressed misc reviewer's comments

Changes in v3:
 - Removed useless FSRRESTORE reset and definition as pointed
   out in Robin Murphy's review
 - Fixed qcom,iommu.txt changes: squashed MSM8976 compatible
   string addition with msm-iommu-v2 generics addition

Changes in v2:
 - Added back Marijn's notes (sorry man!)
 - Added ARM_SMMU_CB_FSRRESTORE definition
 - Changed context bank reset to properly set FSR and FSRRESTORE

AngeloGioacchino Del Regno (6):
  dt-bindings: iommu: qcom,iommu: Add qcom,ctx-num property
  iommu/qcom: Use the asid read from device-tree if specified
  iommu/qcom: Disable and reset context bank before programming
  iommu/qcom: Index contexts by asid number to allow asid 0
  dt-bindings: iommu: qcom,iommu: Add QSMMUv2 and MSM8976 compatibles
  iommu/qcom: Add support for QSMMUv2 and QSMMU-500 secured contexts

 .../devicetree/bindings/iommu/qcom,iommu.yaml | 22 +++++--
 drivers/iommu/arm/arm-smmu/qcom_iommu.c       | 62 ++++++++++++++-----
 2 files changed, 64 insertions(+), 20 deletions(-)

-- 
2.40.1