linux-kernel - Re: [PATCH 0/2] mmc: ingenic: Support bi-directional DMA channel

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Date:   Tue, 21 Dec 2021 14:03:17 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Rob Herring <robh+dt@...nel.org>, list@...ndingux.net,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH 0/2] mmc: ingenic: Support bi-directional DMA channel

On Mon, 20 Dec 2021 at 20:08, Paul Cercueil <paul@...pouillou.net> wrote:
>
> Hi Ulf,
>
> This patchset adds support for using a single DMA channel for both RX
> and TX operations, instead of using separate DMA channels for each
> operation.
>
> As some older Ingenic SoCs offer only a handful of DMA channels,
> supporting bi-directional channels allow more hardware to use the
> channels that would otherwise be used for the MMC/SD operation.
>
> Note that the Device Tree binding for the DMA controller has been
> updated in a (already merged) patchset, so that it accepts a 3 cells
> (#dma-cells == 3) instead of just 2. It was merged in the DMA tree, so I
> am not sure the autobuilders will like this YAML - but it was checked
> without errors.
>
> I also removed the descriptions of the "dmas" property in the YAML, as
> they really weren't adding anything and were getting in my way.
>
> There are patches touching the driver file merged in the PM tree (the
> ones that use the new PM macros) but I expect no problem here, they
> touch different parts of the file.
>
> Cheers,
> -Paul
>
> Paul Cercueil (2):
>   dt-bindings: mmc: ingenic: Support using bi-directional DMA channel
>   mmc: jz4740: Support using a bi-directional DMA channel
>
>  .../devicetree/bindings/mmc/ingenic,mmc.yaml  | 37 ++++++++++++++++---
>  drivers/mmc/host/jz4740_mmc.c                 | 19 +++++++++-
>  2 files changed, 48 insertions(+), 8 deletions(-)
>

Applied for next, thanks!

Let's see how this goes when the changes hit linux-next. I will have
to drop them, if we encounter any problems.

Kind regards
Uffe