linux-kernel - Re: [PATCH v2 03/17] dt-bindings: soc/microchip: make systemcontroller a mfd

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Date:   Tue, 21 Dec 2021 13:55:33 -0400
From:   Rob Herring <robh@...nel.org>
To:     conor.dooley@...rochip.com
Cc:     linus.walleij@...aro.org, bgolaszewski@...libre.com,
        jassisinghbrar@...il.com, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, a.zummo@...ertech.it,
        alexandre.belloni@...tlin.com, broonie@...nel.org,
        gregkh@...uxfoundation.org, thierry.reding@...il.com,
        u.kleine-koenig@...gutronix.de, lee.jones@...aro.org,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-crypto@...r.kernel.org, linux-rtc@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-usb@...r.kernel.org,
        krzysztof.kozlowski@...onical.com, geert@...ux-m68k.org,
        bin.meng@...driver.com, heiko@...ech.de, lewis.hanly@...rochip.com,
        daire.mcnamara@...rochip.com, ivan.griffin@...rochip.com,
        atish.patra@....com
Subject: Re: [PATCH v2 03/17] dt-bindings: soc/microchip: make
 systemcontroller a mfd

On Fri, Dec 17, 2021 at 09:33:11AM +0000, conor.dooley@...rochip.com wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
> 
> Make the system controller on the Polarfire SoC
> a "simple,mfd" so that the services can be child
> nodes of the system controller node.
> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  .../microchip,mpfs-sys-controller.yaml        | 33 +++++++++++++++++--
>  1 file changed, 30 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-sys-controller.yaml b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-sys-controller.yaml
> index f699772fedf3..014cb44b8f31 100644
> --- a/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-sys-controller.yaml
> +++ b/Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-sys-controller.yaml
> @@ -13,13 +13,34 @@ description: |
>    The PolarFire SoC system controller is communicated with via a mailbox.
>    This document describes the bindings for the client portion of that mailbox.
>  
> -
>  properties:
>    mboxes:
>      maxItems: 1
>  
>    compatible:
> -    const: microchip,mpfs-sys-controller
> +    items:
> +      - const: microchip,mpfs-sys-controller
> +      - const: simple-mfd

'simple-mfd' means there is zero dependency on the parent for the child 
nodes. Isn't 'mboxes' a dependency?

> +
> +  hwrandom:
> +    type: object
> +
> +    properties:
> +      compatible:
> +        const: microchip,mpfs-rng
> +
> +    required:
> +      - compatible
> +
> +  sysserv:
> +    type: object
> +
> +    properties:
> +      compatible:
> +        const: microchip,mpfs-generic-service
> +
> +    required:
> +      - compatible

There's not really any need to have child nodes which have no resources. 
The driver for microchip,mpfs-sys-controller can create child devices.

Rob