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dmaengine: ste_dma40: Fetch the number of physical channels from DT 

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: Dan Williams <djbw@fb.com>
Cc: Per Forlin <per.forlin@stericsson.com>
Cc: Rabin Vincent <rabin@rab.in>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Lee Jones 2013-05-15 10:52:01 +01:00 committed by Linus Walleij
parent 0117f7c7a3
commit fd59f9e6ab
1 changed files with 6 additions and 1 deletions
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7
drivers/dma/ste_dma40.c
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@ -3482,7 +3482,7 @@ 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;
const const __be32 *list;
pdata = devm_kzalloc(&pdev->dev,
@ -3491,6 +3491,11 @@ 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;
list = of_get_property(np, "memcpy-channels", &num_memcpy);
num_memcpy /= sizeof(*list);