iommu/ipmmu-vmsa: Add r8a7795 DT binding
Update the IPMMU DT binding documentation to include the r8a7795 compat string as well as the "renesas,ipmmu-main" property that on r8a7795 will be used to describe the topology and the relationship between the various cache IPMMU instances and the main IPMMU. Signed-off-by: NMagnus Damm <damm+renesas@opensource.se> Reviewed-by: NSimon Horman <horms+renesas@verge.net.au> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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