On Thu, Oct 29, 2015 at 11:08:13PM -0400, Sinan Kaya wrote:
> This patch adds support for hidma engine. The driver
> consists of two logical blocks. The DMA engine interface
> and the low-level interface. This version of the driver
> does not support virtualization on this release and only
> memcpy interface support is included.
>
> Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/dma/qcom_hidma.txt | 18 +
> drivers/dma/Kconfig | 11 +
> drivers/dma/Makefile | 4 +
> drivers/dma/qcom_hidma.c | 1717 ++++++++++++++++++++
> drivers/dma/qcom_hidma.h | 44 +
> drivers/dma/qcom_hidma_ll.c | 1132 +++++++++++++
> 6 files changed, 2926 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/dma/qcom_hidma.txt
> create mode 100644 drivers/dma/qcom_hidma.c
> create mode 100644 drivers/dma/qcom_hidma.h
> create mode 100644 drivers/dma/qcom_hidma_ll.c
>
> diff --git a/Documentation/devicetree/bindings/dma/qcom_hidma.txt b/Documentation/devicetree/bindings/dma/qcom_hidma.txt
> new file mode 100644
> index 0000000..9a01635
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/qcom_hidma.txt
> @@ -0,0 +1,18 @@
> +Qualcomm Technologies HIDMA Channel driver
> +
> +Required properties:
> +- compatible: must contain "qcom,hidma"
> +- reg: Addresses for the transfer and event channel
> +- interrupts: Should contain the event interrupt
> +- desc-count: Number of asynchronous requests this channel can handle
> +- event-channel: The HW event channel completions will be delivered.
> +Example:
> +
> + hidma_24: hidma@0x5c050000 {
> + compatible = "qcom,hidma";
> + reg = <0 0x5c050000 0x0 0x1000>,
> + <0 0x5c0b0000 0x0 0x1000>;
> + interrupts = <0 389 0>;
> + desc-count = <10>;
> + event-channel = /bits/ 8 <4>;
The documentation above didn't state this was an 8-bit quantity, and you
save nothing by doing this (all values in the binary format are padded
to 4-byte alignment).
Have this as a cell, and use of_property_read_u32. That means you may
need a temporary u32, but it's far less surprising and makes things far
easier for dts authors to get right.
Thanks,
Mark.
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