linux-kernel - Re: [PATCH v3 4/6] mfd: dt: Add bindings for the Aspeed LPC Host Controller (LHC)

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Message-ID: <CACPK8XfuZ14Ud3Kginut7f0-_-UjTB-=Pma-9WwNecF93k0Ktg@mail.gmail.com>
Date:   Thu, 8 Dec 2016 12:42:30 +1030
From:   Joel Stanley <joel@....id.au>
To:     Andrew Jeffery <andrew@...id.au>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Corey Minyard <minyard@....org>,
        Cédric Le Goater <clg@...d.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/6] mfd: dt: Add bindings for the Aspeed LPC Host
 Controller (LHC)

On Tue, Dec 6, 2016 at 1:23 PM, Andrew Jeffery <andrew@...id.au> wrote:
> The LPC bus pinmux configuration on fifth generation Aspeed SoCs depends
> on bits in both the System Control Unit and the LPC Host Controller.
>
> The Aspeed LPC Host Controller is described as a child node of the
> LPC host-range syscon device for arbitration of access by the host
> controller and pinmux drivers.
>
> Signed-off-by: Andrew Jeffery <andrew@...id.au>
> ---
>  .../devicetree/bindings/mfd/aspeed-lpc.txt         | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> index a97131aba446..9de318ef72da 100644
> --- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> +++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
> @@ -109,3 +109,25 @@ lpc: lpc@...89000 {
>         };
>  };
>
> +Host Node Children
> +==================
> +
> +LPC Host Controller
> +-------------------
> +
> +The Aspeed LPC Host Controller configures the Low Pin Count (LPC) bus behaviour
> +between the host and the baseboard management controller. The registers exist
> +in the "host" portion of the Aspeed LPC controller, which must be the parent of
> +the LPC host controller node.
> +
> +Required properties:
> +- compatible:          "aspeed,ast2500-lhc";

Can you remind me why this binding doesn't cover the ast2400?

Cheers,

Joel

> +- reg:                 contains offset/length value of the LHC memory
> +                       region.
> +
> +Example:
> +
> +lhc: lhc@20 {
> +       compatible = "aspeed,ast2500-lhc";
> +       reg = <0x20 0x24 0x48 0x8>;
> +};
> --
> 2.9.3
>