[PATCH v9 05/10] ASoC: fsl-ssi: Use generic DMA bindings if possible

[Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>]

There may be some platforms using fsl-ssi that do not have a DMA driver
with generic DMA bindings. So this patch adds support for the generic
DMA bindings, while still accepting the old "fsl,dma-events" property if
"dmas" is not found.

Signed-off-by: Markus Pargmann <mpa-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Tested-by: Shawn Guo <shawn.guo-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---

Notes:
    Changes in v5:
     - Not passing of_node now, instead setting the parent device
    
    Changes in v4:
     - Change TODO comment to a FIXME, to remove the old dma-events property as soon
       as all dma drivers support the generic DMA bindings.

 sound/soc/fsl/fsl_ssi.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 2fe4dbd..ed1fbbb 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -803,15 +803,19 @@ static int fsl_ssi_probe(struct platform_device *pdev)
 			&ssi_private->filter_data_tx;
 		ssi_private->dma_params_rx.filter_data =
 			&ssi_private->filter_data_rx;
-		/*
-		 * TODO: This is a temporary solution and should be changed
-		 * to use generic DMA binding later when the helplers get in.
-		 */
-		ret = of_property_read_u32_array(pdev->dev.of_node,
+		if (!of_property_read_bool(pdev->dev.of_node, "dmas") &&
+				ssi_private->use_dma) {
+			/*
+			 * FIXME: This is a temporary solution until all
+			 * necessary dma drivers support the generic dma
+			 * bindings.
+			 */
+			ret = of_property_read_u32_array(pdev->dev.of_node,
 					"fsl,ssi-dma-events", dma_events, 2);
-		if (ret && !ssi_private->use_dma) {
-			dev_err(&pdev->dev, "could not get dma events\n");
-			goto error_clk;
+			if (ret && ssi_private->use_dma) {
+				dev_err(&pdev->dev, "could not get dma events but fsl-ssi is configured to use DMA\n");
+				goto error_clk;
+			}
 		}
 
 		shared = of_device_is_compatible(of_get_parent(np),
-- 
1.8.2.1