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The portal driver is bound to DPIO objects discovered on the fsl-mc bus and provides services that: - allow other drivers, such as the Ethernet driver, to enqueue and dequeue frames for their respective objects A system will typically allocate 1 DPIO object per CPU to allow queuing operations to happen simultaneously across all CPUs. Signed-off-by: Hemant Agrawal <hemant.agrawal@nxp.com>