On Wed, May 15, 2013 at 10:52:02AM +0100, Lee Jones wrote:
> Some platforms have channels which are not available for normal use.
> 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@xxxxxxxxx>
> Cc: Dan Williams <djbw@xxxxxx>
> Cc: Per Forlin <per.forlin@xxxxxxxxxxxxxx>
> Cc: Rabin Vincent <rabin@xxxxxx>
> Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
Acked-by: Vinod Koul <vinod.koul@xxxxxxxxx>
> ---
> Documentation/devicetree/bindings/dma/ste-dma40.txt | 2 ++
> drivers/dma/ste_dma40.c | 17 ++++++++++++++++-
> 2 files changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/dma/ste-dma40.txt b/Documentation/devicetree/bindings/dma/ste-dma40.txt
> index aa272d8..bea5b73 100644
> --- a/Documentation/devicetree/bindings/dma/ste-dma40.txt
> +++ b/Documentation/devicetree/bindings/dma/ste-dma40.txt
> @@ -11,6 +11,7 @@ Required properties:
> Optional properties:
> - dma-channels: Number of channels supported by hardware - if not present
> the driver will attempt to obtain the information from H/W
> +- disabled-channels: Channels which can not be used
>
> Example:
>
> @@ -23,6 +24,7 @@ Example:
>
> #dma-cells = <2>;
> memcpy-channels = <56 57 58 59 60>;
> + disabled-channels = <12>;
> dma-channels = <8>;
> };
>
> diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
> index 4e528dd..ffac822 100644
> --- 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_phy = 0, num_memcpy = 0;
> + int num_phy = 0, num_memcpy = 0, num_disabled = 0;
> const const __be32 *list;
>
> pdata = devm_kzalloc(&pdev->dev,
> @@ -3511,6 +3511,21 @@ static int __init d40_of_probe(struct platform_device *pdev,
> dma40_memcpy_channels,
> num_memcpy);
>
> + list = of_get_property(np, "disabled-channels", &num_disabled);
> + num_disabled /= sizeof(*list);
> +
> + if (num_disabled > STEDMA40_MAX_PHYS || num_disabled < 0) {
> + d40_err(&pdev->dev,
> + "Invalid number of disabled channels specified (%d)\n",
> + num_disabled);
> + return -EINVAL;
> + }
> +
> + of_property_read_u32_array(np, "disabled-channels",
> + pdata->disabled_channels,
> + num_disabled);
> + pdata->disabled_channels[num_disabled] = -1;
> +
> pdev->dev.platform_data = pdata;
>
> return 0;
> --
> 1.7.10.4
>
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