Consult on ARM SMMU debugfs

[chenxiang (M)]

Hi Will,  Robin or other guys,

When debugging SMMU/SVA issue on huawei ARM64 board, we find that it 
lacks of enough debugfs for ARM SMMU driver (such as

the value of STE/CD which we need to check sometimes). Currently it 
creates top-level iommu directory in debugfs, but there is no debugfs

for ARM SMMU driver specially. Do you know whether ARM have the plan to 
do that recently?


Best regards,

Shawn