Add a DT property to control an optional external reset line
Signed-off-by: Ramiro Oliveira <roliveir@xxxxxxxxxxxx>
---
drivers/dma/xilinx/xilinx_dma.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 5c9f11b..b845224 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -46,6 +46,7 @@
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/reset.h>
#include "../dmaengine.h"
@@ -409,6 +410,7 @@ struct xilinx_dma_device {
struct clk *rxs_clk;
u32 nr_channels;
u32 chan_id;
+ struct reset_control *rst;
};
/* Macros */
@@ -2543,6 +2545,27 @@ static int xilinx_dma_probe(struct platform_device *pdev)
if (IS_ERR(xdev->regs))
return PTR_ERR(xdev->regs);
+ xdev->rst = devm_reset_control_get_optional(&pdev->dev, "reset");
+ if (IS_ERR(xdev->rst)) {
+ err = PTR_ERR(xdev->rst);
+ switch (err) {
+ case -ENOENT:
+ case -ENOTSUPP:
+ xdev->rst = NULL;
+ break;
+ default:
+ dev_err(xdev->dev, "error getting reset %d\n", err);
+ return err;
+ }
+ } else {
+ err = reset_control_deassert(xdev->rst);
+ if (err) {
+ dev_err(xdev->dev, "failed to deassert reset: %d\n",
+ err);
+ return err;
+ }
+ }
+
/* Retrieve the DMA engine properties from the device tree */
xdev->has_sg = of_property_read_bool(node, "xlnx,include-sg");
if (xdev->dma_config->dmatype == XDMA_TYPE_AXIDMA)
--
2.10.2
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