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Some Layerscape SoCs use a simple MSI controller implementation. It contains only two SCFG register to trigger and describe a group 32 MSI interrupts. The patch adds bindings to describe the controller. Signed-off-by: Minghuan Lian <Minghuan.Lian@nxp.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>