On Mon, Jun 26, 2017 at 06:19:27PM +0530, Abhishek Sahu wrote:
> Some of the DMA controllers are capable of issuing the commands
> to peripheral by the DMA. These commands can be list of register
> reads/writes and its different from normal data reads/writes.
> This patch adds new flag DMA_PREP_CMD in DMA API which tells
> the driver that the data passed to DMA API is in command format
> and DMA driver will form descriptor in the required format.
>
> This flag can be used by any DMA controller driver which requires
> special handling for non-Data descriptors.
Please add Documentation for this new flag in Documentation/dmaengine/provider.txt
>
> Signed-off-by: Abhishek Sahu <absahu@xxxxxxxxxxxxxx>
> ---
> include/linux/dmaengine.h | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index 5336808..bbc297e 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -186,6 +186,8 @@ struct dma_interleaved_template {
> * on the result of this operation
> * @DMA_CTRL_REUSE: client can reuse the descriptor and submit again till
> * cleared or freed
> + * @DMA_PREP_CMD: tell the driver that the data passed to DMA API is in command
> + * format and it will be used for configuring the peripheral registers.
Can you explain what is command format..?
> */
> enum dma_ctrl_flags {
> DMA_PREP_INTERRUPT = (1 << 0),
> @@ -195,6 +197,7 @@ enum dma_ctrl_flags {
> DMA_PREP_CONTINUE = (1 << 4),
> DMA_PREP_FENCE = (1 << 5),
> DMA_CTRL_REUSE = (1 << 6),
> + DMA_PREP_CMD = (1 << 7),
> };
>
> /**
> --
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
>
--
~Vinod
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