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

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Date:   Wed, 30 Mar 2022 22:54:47 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     vkoul@...nel.org
CC:     zong.li@...ive.com, robh+dt@...nel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, krzysztof.kozlowski@...onical.com,
        conor.dooley@...rochip.com, geert@...ux-m68k.org,
        bin.meng@...driver.com, green.wan@...ive.com,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject:     Re: [PATCH v8 0/4] Determine the number of DMA channels by 'dma-channels' property

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?