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    Subject[PATCH 4/5] dmaengine: ste_dma40: Fetch the number of physical channels from DT
    Date
    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@intel.com>
    Cc: Dan Williams <djbw@fb.com>
    Cc: Per Forlin <per.forlin@stericsson.com>
    Cc: Rabin Vincent <rabin@rab.in>
    Signed-off-by: Lee Jones <lee.jones@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


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