linux-kernel - Re: [PATCH 1/6] dt-bindings: mfd: Add hi6421v530 bindings

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Date:   Wed, 31 May 2017 13:07:55 -0500
From:   Rob Herring <robh@...nel.org>
To:     Guodong Xu <guodong.xu@...aro.org>
Cc:     lee.jones@...aro.org, mark.rutland@....com, xuwei5@...ilicon.com,
        catalin.marinas@....com, will.deacon@....com, lgirdwood@...il.com,
        broonie@...nel.org, khilman@...libre.com, arnd@...db.de,
        gregory.clement@...e-electrons.com, olof@...om.net,
        thomas.petazzoni@...e-electrons.com, yamada.masahiro@...ionext.com,
        riku.voipio@...aro.org, treding@...dia.com, krzk@...nel.org,
        eric@...olt.net, damm+renesas@...nsource.se,
        ard.biesheuvel@...aro.org, linus.walleij@...aro.org,
        geert+renesas@...der.be, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        hw.wangxiaoyin@...ilicon.com
Subject: Re: [PATCH 1/6] dt-bindings: mfd: Add hi6421v530 bindings

On Fri, May 26, 2017 at 02:35:13PM +0800, Guodong Xu wrote:
> DT bindings for hisilicon HI655x PMIC chip.
> 
> Signed-off-by: Guodong Xu <guodong.xu@...aro.org>
> ---
>  .../bindings/mfd/hisilicon,hi6421v530.txt          | 25 ++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/hisilicon,hi6421v530.txt
> 
> diff --git a/Documentation/devicetree/bindings/mfd/hisilicon,hi6421v530.txt b/Documentation/devicetree/bindings/mfd/hisilicon,hi6421v530.txt
> new file mode 100644
> index 0000000..6ffe6f6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/hisilicon,hi6421v530.txt
> @@ -0,0 +1,25 @@
> +Hisilicon Hi6421v530 Power Management Integrated Circuit (PMIC)
> +
> +The hardware layout for access PMIC Hi6421v530 from AP SoC Hi3660.
> +Between PMIC Hi6421v530 and Hi3660, the physical signal channel is SSI.
> +We can use memory-mapped I/O to communicate.
> +
> ++----------------+             +-------------+
> +|                |             |             |
> +|    Hi3660      |   SSI bus   |  Hi6421v530 |
> +|                |-------------|             |
> +|                |(REGMAP_MMIO)|             |
> ++----------------+             +-------------+

regmap is a Linuxism and should not be part of the binding.

So there some sort of controller that generates SSI packets? based on 
MMIO addresses? That should be more fully described here. For example, 
the PMIC should probably be a child of the controller.