[PATCH v2 3/4] dw_dmac: make wrapper on of_dma_controller_register()

[Andy Shevchenko]

This patch introduces new method dw_dma_of_controller_register() and adds
checks of the of_node presence together with CONFIG_OF before calling the
wrapper. It helps to distinguish the real -ENODEV return code of fake one when
of_dma_controller_register is not implemented.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
 drivers/dma/dw_dmac.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 274fd7d..c1f017b 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1303,6 +1303,16 @@ static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
 	return dma_request_channel(cap, dw_dma_of_filter, &fargs);
 }
 
+static void dw_dma_of_controller_register(struct dw_dma *dw)
+{
+	struct device *dev = dw->dma.dev;
+	int err;
+
+	err = of_dma_controller_register(dev->of_node, dw_dma_of_xlate, dw);
+	if (err)
+		dev_err(dev, "could not register of_dma_controller\n");
+}
+
 /* --------------------- Cyclic DMA API extensions -------------------- */
 
 /**
@@ -1843,13 +1853,8 @@ static int dw_probe(struct platform_device *pdev)
 
 	dma_async_device_register(&dw->dma);
 
-	if (pdev->dev.of_node) {
-		err = of_dma_controller_register(pdev->dev.of_node,
-						 dw_dma_of_xlate, dw);
-		if (err && err != -ENODEV)
-			dev_err(&pdev->dev,
-				"could not register of_dma_controller\n");
-	}
+	if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
+		dw_dma_of_controller_register(dw);
 
 	return 0;
 }
-- 
1.8.2.rc0.22.gb3600c3

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