dmaengine: axi-dmac: move active_descs list init after device-tree init

We want to enable the clock right after it is obtained. Then later we'll
want to read the core version via register-access (which requires the clock
to be enabled).

The initialization of the active_descs list can be postponed after reading
from registers (or reading the device-tree).
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20200825151950.57605-3-alexandru.ardelean@analog.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/dma-axi-dmac.c

@@ -850,8 +850,6 @@ static int axi_dmac_probe(struct platform_device *pdev)
 	if (IS_ERR(dmac->clk))
 		return PTR_ERR(dmac->clk);
 
-	INIT_LIST_HEAD(&dmac->chan.active_descs);
-
 	of_channels = of_get_child_by_name(pdev->dev.of_node, "adi,channels");
 	if (of_channels == NULL)
 		return -ENODEV;
@@ -866,6 +864,8 @@ static int axi_dmac_probe(struct platform_device *pdev)
 	}
 	of_node_put(of_channels);
 
+	INIT_LIST_HEAD(&dmac->chan.active_descs);
+
 	pdev->dev.dma_parms = &dmac->dma_parms;
 	dma_set_max_seg_size(&pdev->dev, UINT_MAX);