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

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Date:   Thu, 21 Apr 2022 09:07:59 +0800
From:   Zong Li <zong.li@...ive.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>, Vinod <vkoul@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Bin Meng <bin.meng@...driver.com>,
        Green Wan <green.wan@...ive.com>,
        "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" 
        <dmaengine@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <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 Wed, Apr 20, 2022 at 10:26 PM Rob Herring <robh+dt@...nel.org> wrote:
>
> On Tue, Apr 19, 2022 at 7:18 PM Palmer Dabbelt <palmer@...belt.com> wrote:
> >
> > On Mon, 11 Apr 2022 04:43:35 PDT (-0700), zong.li@...ive.com wrote:
> > > On Mon, Apr 11, 2022 at 6:48 PM Vinod Koul <vkoul@...nel.org> wrote:
> > >>
> > >> On 11-04-22, 10:51, Zong Li wrote:
> > >> > On Fri, Apr 8, 2022 at 9:13 PM Vinod Koul <vkoul@...nel.org> wrote:
> > >> > >
> > >> > > On 28-03-22, 17:52, Zong Li 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.
> > >> > >
> > >> > > Applied patch 1 & 4 to dmaengine-next, thanks
> > >> >
> > >> > Hi Vinod,
> > >> > Thanks for your help and review. For patch 2 and 3, does it mean that
> > >> > we should go through the riscv tree?
> > >>
> > >> Yes
> > >>
> > >
> > > Hi Palmer,
> > > Could you please help me to pick up the patch 2 and 3. Thanks :)
> >
> > Sorry about that, I forgot about this one.  I just put them on for-next,
> > there was a minor merge conflict but it looks pretty simple.
>
> Looks like you applied patch 1 too which Vinod already applied to the
> dmaengine tree. And you changed the 1st line removing the "# " before
> the SPDX tag which results in:

Hi Palmer,
Many thanks for helping me to pick them into riscv-tree, It seems like
we need to pick patch 2 and 3 in riscv tree, instead of patch 1 and 2.
:)

>
> make[1]: *** Deleting file
> 'Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.example.dts'
> Traceback (most recent call last):
>   File "/usr/local/bin/dt-extract-example", line 52, in <module>
>     binding = yaml.load(open(args.yamlfile, encoding='utf-8').read())
>   File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/main.py",
> line 434, in load
>     return constructor.get_single_data()
>   File "/usr/local/lib/python3.8/dist-packages/ruamel/yaml/constructor.py",
> line 119, in get_single_data
>     node = self.composer.get_single_node()
>   File "_ruamel_yaml.pyx", line 718, in _ruamel_yaml.CParser.get_single_node
> ruamel.yaml.composer.ComposerError: expected a single document in the stream
>   in "<unicode string>", line 1, column 1
> but found another document
>   in "<unicode string>", line 2, column 1
> make[1]: *** [Documentation/devicetree/bindings/Makefile:26:
> Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.example.dts]
> Error 1
> ./Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml:1:1:
> [error] missing document start "---" (document-start)
>
>
> Rob