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

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Message-ID: <CAP6Zq1i42ZUJmt_=VpLa6e-gzOndMFYL-Tuc1gEPr-fARS3VBA@mail.gmail.com>
Date:   Thu, 14 Dec 2023 15:34:53 +0200
From:   Tomer Maimon <tmaimon77@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     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, 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

Hi Krzysztof,

Thanks for your comments.

On Thu, 14 Dec 2023 at 09:56, Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> 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.
Did you mean to do the compatible as follows?
properties:
  compatible:
    items:
      - enum:
          - nuvoton,npcm845-bpc
      - const: nuvoton,npcm750-bpc

Appreciate it if you could explain what is the difference between the
compatibility suggested in V3?
>
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  nuvoton,monitor-ports:
> > +    $ref: /schemas/types.yaml#/definitions/uint32-array
>
> Missing constraints, like min/maxItems and maybe values.
O.K.
>
> > +    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?
Modify in V4
>
> > +    description:
> > +      Set DWCAPTURE bit in BPCFEN register that enables double word capture
> > +      according to the first address setting.
> > +    type: boolean
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - nuvoton,monitor-ports
>
> Best regards,
> Krzysztof
>

Thanks,

Tomer