Re: [PATCH v3 0/2] dmaengine: qcom: bam_dma: Add "powered remotely" mode for BAM-DMUX

[Stephan Gerhold <stephan@gerhold.net>]

On Mon, Oct 25, 2021 at 11:18:08AM +0530, Vinod Koul wrote:
> On 18-10-21, 12:24, Stephan Gerhold wrote:
> > The BAM Data Multiplexer (BAM-DMUX) provides access to the network data
> > channels of modems integrated into many older Qualcomm SoCs, e.g.
> > Qualcomm MSM8916 or MSM8974.
> > 
> > Shortly said, BAM-DMUX is built using a simple protocol layer on top of
> > a DMA engine (Qualcomm BAM DMA). For BAM-DMUX, the BAM DMA engine runs in
> > a special mode where the modem/remote side is responsible for powering
> > on the BAM when needed but we are responsible to initialize it.
> > The BAM is powered off when unneeded by coordinating power control
> > via bidirectional interrupts from the BAM-DMUX driver.
> > 
> > This series adds one possible solution for handling the "powered remotely"
> > mode in the bam_dma driver.
> 
> This looks good me me. Bhupesh/Stephan what was the conclusion on the
> the discussion you folks had?
> 

Basically I said I would wait if you still want to take this for 5.16. :)
There is a conflict with the DT schema conversion in Bhupesh's series,
but it's trivial to solve no matter which of the patches is applied first.

Since Bhupesh still needs to send v5 as far as I can tell (and has a
much larger series overall), I think it's fine to apply this one first.

Bhupesh, you can just copy-paste this below qcom,controlled-remotely
in your DT schema if Vinod applies this patch first:

  qcom,powered-remotely:
    $ref: /schemas/types.yaml#/definitions/flag
    description:
      Indicates that the bam is powered up by a remote processor
      but must be initialized by the local processor.

Thanks!
Stephan