linux-kernel - [PATCH 1/2] mtd: nand: omap2: Support parsing dma channel information from DT

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Date:	Tue,  3 May 2016 12:50:05 -0500
From:	Franklin S Cooper Jr <fcooper@...com>
To:	robh+dt@...nel.org, boris.brezillon@...e-electrons.com,
	richard@....at, dwmw2@...radead.org, computersforpeace@...il.com,
	tony@...mide.com, rogerq@...com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Cc:	"Cooper Jr., Franklin" <fcooper@...com>
Subject: [PATCH 1/2] mtd: nand: omap2: Support parsing dma channel information from DT

From: "Cooper Jr., Franklin" <fcooper@...com>

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>
---
 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 08e1588..f864369 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -1922,7 +1922,9 @@ 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