linux-kernel - Re: [PATCH v8 0/4] Determine the number of DMA channels by 'dma-channels' property

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Message-ID: <CANXhq0oJKRVV2QyzJ2WV1fjcw3piyoKeiR5U-=DqsyDayixTGA@mail.gmail.com>
Date:   Fri, 1 Apr 2022 13:50:50 +0800
From:   Zong Li <zong.li@...ive.com>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Vinod <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Bin Meng <bin.meng@...driver.com>,
        Green Wan <green.wan@...ive.com>,
        dmaengine <dmaengine@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v8 0/4] Determine the number of DMA channels by
 'dma-channels' property

On Fri, Apr 1, 2022 at 6:42 AM Palmer Dabbelt <palmer@...belt.com> wrote:
>
> On Wed, 30 Mar 2022 22:54:47 PDT (-0700), Palmer Dabbelt wrote:
> > On Wed, 30 Mar 2022 22:21:56 PDT (-0700), vkoul@...nel.org wrote:
> >> On 30-03-22, 20:15, Palmer Dabbelt wrote:
> >>> On Mon, 28 Mar 2022 02:52:21 PDT (-0700), zong.li@...ive.com wrote:
> >>> > The PDMA driver currently assumes there are four channels by default, it
> >>> > might cause the error if there is actually less than four channels.
> >>> > Change that by getting number of channel dynamically from device tree.
> >>> > For backwards-compatible, it uses the default value (i.e. 4) when there
> >>> > is no 'dma-channels' information in dts.
> >>> >
> >>> > This patch set contains the dts and dt-bindings change.
> >>> >
> >>> > Changed in v8:
> >>> >  - Rebase on master
> >>> >  - Remove modification of microchip-mpfs.dtsi
> >>> >  - Rename DMA node name of fu540-c000.dtsi
> >>> >
> >>> > Changed in v7:
> >>> >  - Rebase on tag v5.17-rc7
> >>> >  - Modify the subject of patch
> >>> >
> >>> > Changed in v6:
> >>> >  - Rebase on tag v5.17-rc6
> >>> >  - Change sf_pdma.chans[] to a flexible array member.
> >>> >
> >>> > Changed in v5:
> >>> >  - Rebase on tag v5.17-rc3
> >>> >  - Fix typo in dt-bindings and commit message
> >>> >  - Add PDMA versioning scheme for compatible
> >>> >
> >>> > Changed in v4:
> >>> >  - Remove cflags of debug use reported-by: kernel test robot <lkp@...el.com>
> >>> >
> >>> > Changed in v3:
> >>> >  - Fix allocating wrong size
> >>> >  - Return error if 'dma-channels' is larger than maximum
> >>> >
> >>> > Changed in v2:
> >>> >  - Rebase on tag v5.16
> >>> >  - Use 4 as default value of dma-channels
> >>> >
> >>> > Zong Li (4):
> >>> >   dt-bindings: dma-engine: sifive,fu540: Add dma-channels property and
> >>> >     modify compatible
> >>> >   riscv: dts: Add dma-channels property and modify compatible
> >>> >   riscv: dts: rename the node name of dma
> >>> >   dmaengine: sf-pdma: Get number of channel by device tree
> >>> >
> >>> >  .../bindings/dma/sifive,fu540-c000-pdma.yaml  | 19 +++++++++++++--
> >>> >  arch/riscv/boot/dts/sifive/fu540-c000.dtsi    |  5 ++--
> >>> >  drivers/dma/sf-pdma/sf-pdma.c                 | 24 ++++++++++++-------
> >>> >  drivers/dma/sf-pdma/sf-pdma.h                 |  8 ++-----
> >>> >  4 files changed, 38 insertions(+), 18 deletions(-)
> >>>
> >>> Thanks, these are on for-next.
> >>
> >> The drivers/dma/ should go thru dmaengine tree. During merge window I
> >> dont apply the patches
> >
> > OK, I can drop this from my tree if you'd like?
>
> Just to follow up from IRC: I'm dropping these from my tree.

Hi Palmer and Vinod,
Many thanks for your help. As all you suggested, let's go this
patchset by the dmaengine tree. Thanks a lot!