linux-kernel - Re: [PATCH] dt-bindings: dma: sprd,sc9860-dma: convert to YAML

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Message-ID: <20240704-broadways-phoniness-3d494c4ef09b@spud>
Date: Thu, 4 Jul 2024 18:24:05 +0100
From: Conor Dooley <conor@...nel.org>
To: Stanislav Jakubek <stano.jakubek@...il.com>
Cc: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Orson Zhai <orsonzhai@...il.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	Baolin Wang <baolin.wang7@...il.com>,
	Chunyan Zhang <zhang.lyra@...il.com>, dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: dma: sprd,sc9860-dma: convert to YAML

On Thu, Jul 04, 2024 at 07:09:12PM +0200, Stanislav Jakubek wrote:
> Hi Conor,
> see below.
> 
> On Thu, Jul 04, 2024 at 05:42:39PM +0100, Conor Dooley wrote:
> > On Thu, Jul 04, 2024 at 05:18:09PM +0200, Stanislav Jakubek wrote:
> > > Convert the Spreadtrum SC9860 DMA bindings to DT schema.
> > > 
> > > Changes during conversion:
> > >   - rename file to match compatible
> > >   - make interrupts optional, the AGCP DMA controller doesn't need it
> > >   - describe the optional ashb_eb clock for the AGCP DMA controller
> > > 
> > > Signed-off-by: Stanislav Jakubek <stano.jakubek@...il.com>
> > > ---
> > >  .../bindings/dma/sprd,sc9860-dma.yaml         | 92 +++++++++++++++++++
> > >  .../devicetree/bindings/dma/sprd-dma.txt      | 44 ---------
> > >  2 files changed, 92 insertions(+), 44 deletions(-)
> > >  create mode 100644 Documentation/devicetree/bindings/dma/sprd,sc9860-dma.yaml
> > >  delete mode 100644 Documentation/devicetree/bindings/dma/sprd-dma.txt
> > > 
> > > diff --git a/Documentation/devicetree/bindings/dma/sprd,sc9860-dma.yaml b/Documentation/devicetree/bindings/dma/sprd,sc9860-dma.yaml
> > > new file mode 100644
> > > index 000000000000..e1639593d26d
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/dma/sprd,sc9860-dma.yaml
> > > @@ -0,0 +1,92 @@
> > > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/dma/sprd,sc9860-dma.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Spreadtrum SC9860 DMA controller
> > > +
> > > +description: |
> > > +  There are three DMA controllers: AP DMA, AON DMA and AGCP DMA. For AGCP
> > > +  DMA controller, it can or do not request the IRQ, which will save
> > > +  system power without resuming system by DMA interrupts if AGCP DMA
> > > +  does not request the IRQ.
> > > +
> > > +maintainers:
> > > +  - Orson Zhai <orsonzhai@...il.com>
> > > +  - Baolin Wang <baolin.wang7@...il.com>
> > > +  - Chunyan Zhang <zhang.lyra@...il.com>
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: sprd,sc9860-dma
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> > > +
> > > +  clocks:
> > > +    minItems: 1
> > > +    maxItems: 2
> > > +
> > > +  clock-names:
> > > +    oneOf:
> > > +      - const: enable
> > > +      # The ashb_eb clock is optional and only for AGCP DMA controller
> > > +      - items:
> > > +          - const: enable
> > > +          - const: ashb_eb
> > 
> > This is better written as:
> >   clock-names:
> >     minItems: 1
> >     items:
> >       - const: enable
> >       - const: ashb_eb
> 
> Ok, should I keep the comment?

If you like. Another option would be to define the items for clocks
also, instead of this comment, like:

clocks:
  minItems: 1
  items:
    - main DMA controller clock
    - optional clock for the ashb_eb, only for the AGCP DMA controller


> 
> > 
> > > +
> > > +  '#dma-cells':
> > > +    const: 1
> > > +
> > > +  dma-channels:
> > > +    const: 32
> > > +
> > > +  '#dma-channels':
> > > +    const: 32
> > > +    deprecated: true
> > 
> > If there are no users of this, I'd be inclined to just drop it from the
> > binding.
> > 
> > Cheers,
> > Conor.
> 
> It is specified in DT "For backwards compatibility", see e.g. [1]
> I'm not sure if it's still required, I'm not very familiar with this platform.
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/sprd/whale2.dtsi?h=v6.10-rc6#n124

Then keep it, that's a user ;)

Cheers,
Conor.

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