[PATCH v3 2/6] iommu: mtk_iommu: Lookup phandle to retrieve syscon to infracfg

[Miles Chen]

> This driver will get support for more SoCs and the list of infracfg
> compatibles is expected to grow: in order to prevent getting this
> situation out of control and see a long list of compatible strings,
> add support to retrieve a handle to infracfg's regmap through a
> new "mediatek,infracfg" phandle.

I also like the idea of using mediatek,infracfg instead of a list of
platform compatible strings.

Reviewed-by: Miles Chen <miles.chen at mediatek.com> 

> 
> In order to keep retrocompatibility with older devicetrees, the old
> way is kept in place.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>