linux-kernel - Re: [PATCH v2 1/4] dt-bindings: mfd: Add RZ/V2M PWC

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Message-ID: <CAMuHMdW=+0JU5-d6tSKPsvO7ZxWQzNVf0LvSTfimYoBgg4RrHg@mail.gmail.com>
Date:   Tue, 3 Jan 2023 09:29:19 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     fabrizio.castro.jz@...esas.com
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sebastian Reichel <sre@...nel.org>, Lee Jones <lee@...nel.org>,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        linux-renesas-soc@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo@...ndi.org>
Subject: Re: [PATCH v2 1/4] dt-bindings: mfd: Add RZ/V2M PWC

Hi Fabrizio,

On Wed, Dec 21, 2022 at 10:09 PM Fabrizio Castro
<fabrizio.castro.jz@...esas.com> wrote:
> The Renesas RZ/V2M External Power Sequence Controller (PWC)
> IP is a multi-function device, and it's capable of:
> * external power supply on/off sequence generation
> * on/off signal generation for the LPDDR4 core power supply (LPVDD)
> * key input signals processing
> * general-purpose output pins
>
> Add the corresponding dt-bindings.
>
> Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> ---
>
> v1->v2: I have dropped syscon, simple-mfd, regmap, offset, and the child nodes.

Thanks for the update!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/renesas,rzv2m-pwc.yaml
> @@ -0,0 +1,56 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/renesas,rzv2m-pwc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas RZ/V2M External Power Sequence Controller (PWC)
> +
> +description: |+
> +  The PWC IP found in the RZ/V2M family of chips comes with the below
> +  capabilities
> +    - external power supply on/off sequence generation
> +    - on/off signal generation for the LPDDR4 core power supply (LPVDD)
> +    - key input signals processing
> +    - general-purpose output pins
> +
> +maintainers:
> +  - Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - renesas,r9a09g011-pwc # RZ/V2M
> +          - renesas,r9a09g055-pwc # RZ/V2MA
> +      - const: renesas,rzv2m-pwc
> +
> +  reg:
> +    maxItems: 1
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    const: 2
> +
> +  renesas,rzv2m-pwc-power:
> +    description: The PWC is used to control the system power supplies.
> +    type: boolean

I'm wondering if there is some other way to represent this, e.g.
using DT topology? Some regulator relation?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds