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>

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index ae462d3521101b876de976c162fafe00d2716434..4e528dd30ad5d44ec75ee9b7cccf1df06fe9e593 100644 (file)
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -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);