Re: [PATCH v4] dmaengine: qcom: Add ADM driver

Vinod Koul
2020-11-09T11:41:30Z

HI Jonathan,

On 23-09-20, 20:40, Jonathan McDowell wrote:
> Add the DMA engine driver for the QCOM Application Data Mover (ADM) DMA
> controller found in the MSM8x60 and IPQ/APQ8064 platforms.

Mostly it looks good, some nitpicks

> The ADM supports both memory to memory transactions and memory
> to/from peripheral device transactions. The controller also provides
> flow control capabilities for transactions to/from peripheral devices.
>
> The initial release of this driver supports slave transfers to/from
> peripherals and also incorporates CRCI (client rate control interface)
> flow control.

Can you also convert the binding from txt to yaml?

> diff --git a/drivers/dma/qcom/Kconfig b/drivers/dma/qcom/Kconfig
> index 3bcb689162c6..0389d60d2604 100644
> --- a/drivers/dma/qcom/Kconfig
> +++ b/drivers/dma/qcom/Kconfig
> @@ -1,4 +1,15 @@
> # SPDX-License-Identifier: GPL-2.0-only
> +config QCOM_ADM
> + tristate "Qualcomm ADM support"
> + depends on (ARCH_QCOM || COMPILE_TEST) && !PHYS_ADDR_T_64BIT

why !PHYS_ADDR_T_64BIT ..?

> + select DMA_ENGINE
> + select DMA_VIRTUAL_CHANNELS
> + help
> + Enable support for the Qualcomm Application Data Mover (ADM) DMA
> + controller, as present on MSM8x60, APQ8064, and IPQ8064 devices.
> + This controller provides DMA capabilities for both general purpose
> + and on-chip peripheral devices.

> +static const struct of_device_id adm_of_match[] = {
> + { .compatible = "qcom,adm", },

I know we have merged the binding, but should we not have a soc specific
compatible?

--
~Vinod