On Fri, Feb 21, 2014 at 06:43:05AM +0000, Andy Gross wrote:
> Add the DMA engine driver for the QCOM Bus Access Manager (BAM) DMA controller
> found in the MSM 8x74 platforms.
>
> Each BAM DMA device is associated with a specific on-chip peripheral. Each
> channel provides a uni-directional data transfer engine that is capable of
> transferring data between the peripheral and system memory (System mode), or
> between two peripherals (BAM2BAM).
>
> The initial release of this driver only supports slave transfers between
> peripherals and system memory.
>
> Signed-off-by: Andy Gross <agross@xxxxxxxxxxxxxx>
> ---
> drivers/dma/Kconfig | 9 +
> drivers/dma/Makefile | 1 +
> drivers/dma/qcom_bam_dma.c | 1107 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1117 insertions(+)
> create mode 100644 drivers/dma/qcom_bam_dma.c
[...]
> + bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");
The binding document should describe the "bam_clk" string in the
clock-names description.
[...]
> + ret = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &bdev->ee);
> + if (ret) {
> + dev_err(bdev->dev, "EE unspecified\n");
It would be nice to expand EE to what it stands for, at least in the
error but possibly the binding too.
> +static const struct of_device_id bam_of_match[] = {
> + { .compatible = "qcom,bam-v1.4.0", },
> + { .compatible = "qcom,bam-v1.4.1", },
What are the differences between the two?
Is v1.4.1 an extension of v1.4.0?
Could you have the following in DTs:
compatible = "qcom,bam-v1.4.1", "qcom,bam-v1.4.0";
Then you'd only need the v1.4.0 string in the driver for now.
Thanks,
Mark.
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