linux-kernel - Re: [PATCH v3 1/3] dt-bindings: soc: nuvoton: Add NPCM BPC

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Message-ID: <ccaefd08-161f-4aa1-acc1-5216c5f7f7c7@linaro.org>
Date:   Thu, 14 Dec 2023 08:56:33 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Tomer Maimon <tmaimon77@...il.com>, arnd@...db.de,
        pmenzel@...gen.mpg.de, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        avifishman70@...il.com, tali.perry1@...il.com, joel@....id.au,
        venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
        j.neuschaefer@....net
Cc:     openbmc@...ts.ozlabs.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] dt-bindings: soc: nuvoton: Add NPCM BPC

On 13/12/2023 20:05, Tomer Maimon wrote:
> Added device tree binding documentation for Nuvoton BMC NPCM BIOS Post
> Code (BPC).
> 
> The NPCM BPC monitoring two configurable I/O addresses written by the
> host on the bus.
> 
> Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
> ---
>  .../soc/nuvoton/nuvoton,npcm-bpc.yaml         | 65 +++++++++++++++++++
>  1 file changed, 65 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/nuvoton/nuvoton,npcm-bpc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/nuvoton/nuvoton,npcm-bpc.yaml b/Documentation/devicetree/bindings/soc/nuvoton/nuvoton,npcm-bpc.yaml
> new file mode 100644
> index 000000000000..c04302a1d52b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/nuvoton/nuvoton,npcm-bpc.yaml
> @@ -0,0 +1,65 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/nuvoton/nuvoton,npcm-bpc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nuvoton BMC NPCM BIOS Post Code (BPC) controller
> +
> +maintainers:
> +  - Tomer Maimon <tmaimon77@...il.com>
> +
> +description:
> +  Nuvoton BMC NPCM BIOS Post Code (BPC) monitoring two configurable I/O
> +  addresses written by the host on the bus, the capture data stored in
> +  128-word FIFO.
> +
> +  NPCM BPC supports capture double words, when using capture
> +  double word only I/O address 1 is monitored.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - nuvoton,npcm845-bpc
> +          - nuvoton,npcm750-bpc
> +      - const: nuvoton,npcm-bpc

That's not what I suggested. I asked to make 845 compatible with 750.
This works, but I want to be sure you really, really understand the
consequences of this.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  nuvoton,monitor-ports:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array

Missing constraints, like min/maxItems and maybe values.

> +    description:
> +      Contain monitor I/O addresses on the bus, at least one monitor I/O
> +      address required.
> +
> +  nuvoton,bpc-en-dwcapture:

nuvoton,double-word-capture?

> +    description:
> +      Set DWCAPTURE bit in BPCFEN register that enable double words capture
> +      according to the first address setting.
> +    type: boolean
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - nuvoton,monitor-ports

Best regards,
Krzysztof