linux-kernel - [PATCH v4 4/7] mtd: nand: omap2: Support parsing dma channel information from DT

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Date:	Thu, 10 Mar 2016 17:56:40 -0600
From:	Franklin S Cooper Jr <fcooper@...com>
To:	nsekhar@...com, dwmw2@...radead.org, computersforpeace@...il.com,
	rogerq@...com, tony@...mide.com, devicetree@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc:	Franklin S Cooper Jr <fcooper@...com>
Subject: [PATCH v4 4/7] mtd: nand: omap2: Support parsing dma channel information from DT

Switch from dma_request_channel to allow passing dma channel
information from DT rather than hardcoding a value.

Also provide a handle to the GPMC's dev so it can be used to parse the DMA
channel information within the GPMC's DT node.

Signed-off-by: Franklin S Cooper Jr <fcooper@...com>
---
Version 4 changes:
Pass parent instead of new variable from the platform data

 drivers/mtd/nand/omap2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index c553f78..95bc636 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1731,7 +1731,9 @@ static int omap_nand_probe(struct platform_device *pdev)
 		dma_cap_zero(mask);
 		dma_cap_set(DMA_SLAVE, mask);
 		sig = OMAP24XX_DMA_GPMC;
-		info->dma = dma_request_channel(mask, omap_dma_filter_fn, &sig);
+		info->dma = dma_request_slave_channel_compat(mask,
+			omap_dma_filter_fn, &sig, pdev->dev.parent, "rxtx");
+
 		if (!info->dma) {
 			dev_err(&pdev->dev, "DMA engine request failed\n");
 			err = -ENXIO;
-- 
2.7.0