dt-bindings: PCI: qcom-ep: Describe optional IOMMU

Some of Qualcomm platforms have an IOMMU unit between the PCIe IP and
DDR. For example, the SA8775P specifies the iommu alththough it is not
a part of bindings.

Thus, change the schema in order to require the IOMMU for SA8775P and
forbid it from being used on SDX55 (SM8450 will be handled in a later
patch).

This fixes the following warning:

  pcie-ep@1c10000: Unevaluated properties are not allowed ('iommus' was unexpected)

Fixes: 9d3d5e75f31c ("dt-bindings: PCI: qcom-ep: Add support for SA8775P SoC")
Signed-off-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <[email protected]>

0 files changed, 0 insertions, 0 deletions