[RFC 4/6] dmaengine: edma: Add support for DMA filter mapping to slave devices

[peter.ujfalusi@ti.com (Peter Ujfalusi)]

Add support for providing device to filter_fn mapping so client drivers
can switch to use the dma_request_chan() API.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 drivers/dma/edma.c                 | 6 ++++++
 include/linux/platform_data/edma.h | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 0675e268d577..587ceb9308b3 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -2297,6 +2297,12 @@ static int edma_probe(struct platform_device *pdev)
 		edma_set_chmap(&ecc->slave_chans[i], ecc->dummy_slot);
 	}
 
+	if (info->devnames) {
+		ecc->dma_slave.filter_map.devnames = info->devnames;
+		ecc->dma_slave.filter_map.devcnt = info->devcnt;
+		ecc->dma_slave.filter_map.filter_fn = edma_filter_fn;
+	}
+
 	ret = dma_async_device_register(&ecc->dma_slave);
 	if (ret) {
 		dev_err(dev, "slave ddev registration failed (%d)\n", ret);
diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h
index e2878baeb90e..58a4dcba0bdf 100644
--- a/include/linux/platform_data/edma.h
+++ b/include/linux/platform_data/edma.h
@@ -76,6 +76,9 @@ struct edma_soc_info {
 
 	s8	(*queue_priority_mapping)[2];
 	const s16	(*xbar_chans)[2];
+
+	char **devnames;
+	int devcnt;
 };
 
 #endif
-- 
2.6.3