[PATCH 4/5] dmaengine: ste_dma40: Fetch the number of physical channels from DT

[Lee Jones]

Some platforms insist on obscure physical channel availability. This
information is currently passed though platform data in internal BSP
kernels. Once those platforms land, they'll need to configure them
appropriately, so we may as well add the infrastructure.

Cc: Vinod Koul <vinod.koul at intel.com>
Cc: Dan Williams <djbw at fb.com>
Cc: Per Forlin <per.forlin at stericsson.com>
Cc: Rabin Vincent <rabin at rab.in>
Signed-off-by: Lee Jones <lee.jones at linaro.org>
---
 drivers/dma/ste_dma40.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 4769141..dbdd67b 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -3464,7 +3464,7 @@ static int __init d40_of_probe(struct platform_device *pdev,
 			       struct device_node *np)
 {
 	struct stedma40_platform_data *pdata;
-	int num_memcpy = 0;
+	int num_phy = 0, num_memcpy = 0;
 
 	pdata = devm_kzalloc(&pdev->dev,
 			     sizeof(struct stedma40_platform_data),
@@ -3472,6 +3472,11 @@ static int __init d40_of_probe(struct platform_device *pdev,
 	if (!pdata)
 		return -ENOMEM;
 
+	/* If absent this value will be obtained from h/w. */
+	of_property_read_u32(np, "dma-channels", &num_phy);
+	if (num_phy > 0)
+		pdata->num_of_phy_chans = num_phy;
+
 	of_property_read_u32(np, "memcpy-num-chans", &num_memcpy);
 
 	if (num_memcpy > D40_MEMCPY_MAX_CHANS || num_memcpy <= 0) {
-- 
1.7.10.4