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

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Message-ID: <mhng-6ddf988e-9f86-4f3e-8b6a-6be65f384829@palmer-ri-x1c9>
Date:   Wed, 30 Mar 2022 20:15:53 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     zong.li@...ive.com
CC:     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, vkoul@...nel.org,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        zong.li@...ive.com
Subject:     Re: [PATCH v8 0/4] Determine the number of DMA channels by 'dma-channels' property

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.