[PATCH 12/31] dma: tegra: use reset framework

Stephen Warren swarren at wwwdotorg.org
Fri Nov 15 15:54:07 EST 2013

From: Stephen Warren <swarren at nvidia.com>

Tegra's clock driver now provides an implementation of the common
reset API (include/linux/reset.h). Use this instead of the old Tegra-
specific API; that will soon be removed.

Cc: treding at nvidia.com
Cc: pdeschrijver at nvidia.com
Cc: linux-tegra at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: Dan Williams <dan.j.williams at intel.com>
Signed-off-by: Stephen Warren <swarren at nvidia.com>
This patch is part of a series with strong internal depdendencies. I'm
looking for an ack so that I can take the entire series through the Tegra
and arm-soc trees. The series will be part of a stable branch that can be
merged into other subsystems if needed to avoid/resolve dependencies.
 drivers/dma/tegra20-apb-dma.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c
index 73654e33f13b..afa5844c9346 100644
--- a/drivers/dma/tegra20-apb-dma.c
+++ b/drivers/dma/tegra20-apb-dma.c
@@ -32,8 +32,8 @@
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <linux/slab.h>
-#include <linux/clk/tegra.h>
 #include "dmaengine.h"
@@ -208,6 +208,7 @@ struct tegra_dma {
 	struct dma_device		dma_dev;
 	struct device			*dev;
 	struct clk			*dma_clk;
+	struct reset_control		*rst;
 	spinlock_t			global_lock;
 	void __iomem			*base_addr;
 	const struct tegra_dma_chip_data *chip_data;
@@ -1282,6 +1283,12 @@ static int tegra_dma_probe(struct platform_device *pdev)
 		return PTR_ERR(tdma->dma_clk);
+	tdma->rst = devm_reset_control_get(&pdev->dev, "dma");
+	if (IS_ERR(tdma->rst)) {
+		dev_err(&pdev->dev, "Error: Missing reset\n");
+		return PTR_ERR(tdma->rst);
+	}
@@ -1302,9 +1309,9 @@ static int tegra_dma_probe(struct platform_device *pdev)
 	/* Reset DMA controller */
-	tegra_periph_reset_assert(tdma->dma_clk);
+	reset_control_assert(tdma->rst);
-	tegra_periph_reset_deassert(tdma->dma_clk);
+	reset_control_deassert(tdma->rst);
 	/* Enable global DMA registers */

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