net: macb: add dma_burst_length config
GEM support higher DMA burst writes/reads than the default (4). add configuration structure with dma burst length so it could be applied later to DMA configuration. Signed-off-by: NRamon Fried <rfried.dev@gmail.com> Reviewed-by: NAnup Patel <anup.patel@wdc.com> Tested-by: NAnup Patel <anup.patel@wdc.com> Acked-by: NJoe Hershberger <joe.hershberger@ni.com>
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