linux-kernel - Re: [PATCH 4/5] dt-bindings: mips: Document mti,mips-cm

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Date: Tue, 7 May 2024 17:50:49 +0100
From: Conor Dooley <conor@...nel.org>
To: Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Paul Burton <paulburton@...nel.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 4/5] dt-bindings: mips: Document mti,mips-cm

On Tue, May 07, 2024 at 10:01:52AM +0100, Jiaxun Yang wrote:
> Add devicetree binding documentation for MIPS Coherence Manager.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
>  .../devicetree/bindings/mips/mips-cm.yaml          | 37 ++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mips/mips-cm.yaml b/Documentation/devicetree/bindings/mips/mips-cm.yaml
> new file mode 100644
> index 000000000000..b92b008d7758
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mips/mips-cm.yaml

Filename matching the compatible please.

> @@ -0,0 +1,37 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mips/mips-cm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MIPS Coherence Manager
> +
> +description: |
> +  Defines a location of the MIPS Coherence Manager registers.
> +
> +maintainers:
> +  - Jiaxun Yang <jiaxun.yang@...goat.com>
> +
> +properties:
> +  compatible:
> +    const: mti,mips-cm

Is it actually only available on mips? Google seems to report there
being Coherence Managers on their RISC-V offerings too.

> +  reg:
> +    description: |

The | isn't needed, there's no formatting to preserve.

> +      Base address and size of an unoccupied memory region, which will be
> +      used to map the MIPS CM registers block.

This sounds like it should actually be a memory-region that references
some reserved memory, not a reg, given the description. I think the
commit message here is lacking any information about what the intentions
are for this binding.

> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    cm@...f8000 {

And a generic node name here please. I actually don't quite know what to
suggest though, but "coherency-manager" would likely be better than
"cm".

Thanks,
Conor.

> +      compatible = "mti,mips-cm";
> +      reg = <0x1bde8000 0x8000>;
> +    };
> +...
> 
> -- 
> 2.34.1
> 

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