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-rw-r--r--drivers/dma/omap-dma.c30
1 files changed, 21 insertions, 9 deletions
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index ac68666cd3f4..4ad101a47e0a 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -1452,6 +1452,7 @@ static int omap_dma_probe(struct platform_device *pdev)
struct omap_dmadev *od;
struct resource *res;
int rc, i, irq;
+ u32 lch_count;
od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
if (!od)
@@ -1494,20 +1495,31 @@ static int omap_dma_probe(struct platform_device *pdev)
spin_lock_init(&od->lock);
spin_lock_init(&od->irq_lock);
- if (!pdev->dev.of_node) {
- od->dma_requests = od->plat->dma_attr->lch_count;
- if (unlikely(!od->dma_requests))
- od->dma_requests = OMAP_SDMA_REQUESTS;
- } else if (of_property_read_u32(pdev->dev.of_node, "dma-requests",
- &od->dma_requests)) {
+ /* Number of DMA requests */
+ od->dma_requests = OMAP_SDMA_REQUESTS;
+ if (pdev->dev.of_node && of_property_read_u32(pdev->dev.of_node,
+ "dma-requests",
+ &od->dma_requests)) {
dev_info(&pdev->dev,
"Missing dma-requests property, using %u.\n",
OMAP_SDMA_REQUESTS);
- od->dma_requests = OMAP_SDMA_REQUESTS;
}
- od->lch_map = devm_kcalloc(&pdev->dev, od->dma_requests,
- sizeof(*od->lch_map), GFP_KERNEL);
+ /* Number of available logical channels */
+ if (!pdev->dev.of_node) {
+ lch_count = od->plat->dma_attr->lch_count;
+ if (unlikely(!lch_count))
+ lch_count = OMAP_SDMA_CHANNELS;
+ } else if (of_property_read_u32(pdev->dev.of_node, "dma-channels",
+ &lch_count)) {
+ dev_info(&pdev->dev,
+ "Missing dma-channels property, using %u.\n",
+ OMAP_SDMA_CHANNELS);
+ lch_count = OMAP_SDMA_CHANNELS;
+ }
+
+ od->lch_map = devm_kcalloc(&pdev->dev, lch_count, sizeof(*od->lch_map),
+ GFP_KERNEL);
if (!od->lch_map)
return -ENOMEM;