[RFC PATCH 07/13] mmc: omap_hsmmc: dma_request_slave_channel() support for DT platforms

[Matt Porter]

For platforms with DT populated, use dma_request_slave_channel()
to acquire the DMA channel. For !DT platforms, we fall back to
explicitly passing the omap_dma_filter_fn() to dma_request_channel().
Once all platforms boot from DT, the dma_request_channel() path can
be dropped.

Signed-off-by: Matt Porter <mporter at ti.com>
---
 drivers/mmc/host/omap_hsmmc.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 3a09f93..c82d0ab 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1923,14 +1923,26 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	host->rx_chan = dma_request_channel(mask, omap_dma_filter_fn, &rx_req);
+	if (pdev->dev.of_node)
+		host->rx_chan =
+			dma_request_slave_channel(&pdev->dev, "rx");
+	else
+		host->rx_chan = dma_request_channel(mask,
+						    omap_dma_filter_fn,
+						    &rx_req);
 	if (!host->rx_chan) {
 		dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
 		ret = -ENXIO;
 		goto err_irq;
 	}
 
-	host->tx_chan = dma_request_channel(mask, omap_dma_filter_fn, &tx_req);
+	if (pdev->dev.of_node)
+		host->tx_chan =
+			dma_request_slave_channel(&pdev->dev, "tx");
+	else
+		host->tx_chan = dma_request_channel(mask,
+						    omap_dma_filter_fn,
+						    &tx_req);
 	if (!host->tx_chan) {
 		dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
 		ret = -ENXIO;
-- 
1.7.9.5