linux-kernel - Re: [PATCH v2 5/6] dt-bindings: mips: Document mti,mips-cm

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Message-ID: <hupbp2e5phpfvlnbqwbqxhssidyda5p247map437h4mcnbeynw@akf2fuq3jpy3>
Date: Tue, 6 Aug 2024 22:56:08 +0300
From: Serge Semin <fancer.lancer@...il.com>
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 v2 5/6] dt-bindings: mips: Document mti,mips-cm

On Wed, Jun 12, 2024 at 11:08:57AM +0100, Jiaxun Yang wrote:
> Add devicetree binding documentation for MIPS Coherence Manager.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
> v2:
>  - Better wording for register desc
>  - cm -> coherency-manager
>  - schema matches compatible
> ---
>  .../devicetree/bindings/mips/mti,mips-cm.yaml      | 38 ++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mips/mti,mips-cm.yaml b/Documentation/devicetree/bindings/mips/mti,mips-cm.yaml
> new file mode 100644
> index 000000000000..9f500804737d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mips/mti,mips-cm.yaml
> @@ -0,0 +1,38 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mips/mti,mips-cm.yaml#
> +$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
> +

> +  reg:
> +    description:
> +      Base address and size of an unoccupied region in system's MMIO address
> +      space, which will be used to map the MIPS CM global control registers
> +      block. It is conventionally decided by the system integrator.
> +    maxItems: 1

Could you please extend the reg array to containing two values: gcr and
l2sync? The later is the L2-cache-only sync region which can be
customized by the CM means.

It's better to define the reg-names property too, so the node would
look like this:

        cm2: cm2@...f8000 {
                compatible = "mti,mips-cm";
                reg = <0 0x1fbf8000 0 0x8000>,
                      <0 0x1fbf0000 0 0x1000>;
                reg-names = "gcr", "l2sync";
        };

-Serge(y)

> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    coherency-manager@...f8000 {
> +      compatible = "mti,mips-cm";
> +      reg = <0x1bde8000 0x8000>;
> +    };
> +...
> 
> -- 
> 2.43.0
>