linux-kernel - Re: [PATCH 2/3] dt-bindings: arm: amlogic: Add SoC information bindings

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Date:   Fri, 31 Mar 2017 15:44:51 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     Kevin Hilman <khilman@...libre.com>, carlo@...one.org,
        linux-amlogic@...ts.infradead.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: arm: amlogic: Add SoC information bindings

On Fri, Mar 31, 2017 at 10:47 AM, Neil Armstrong
<narmstrong@...libre.com> wrote:
> Add bindings for the SoC information register of the Amlogic SoCs.
>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  Documentation/devicetree/bindings/arm/amlogic.txt | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/amlogic.txt b/Documentation/devicetree/bindings/arm/amlogic.txt
> index bfd5b55..b850985 100644
> --- a/Documentation/devicetree/bindings/arm/amlogic.txt
> +++ b/Documentation/devicetree/bindings/arm/amlogic.txt
> @@ -52,3 +52,23 @@ Board compatible values:
>    - "amlogic,q201" (Meson gxm s912)
>    - "nexbox,a95x" (Meson gxbb or Meson gxl s905x)
>    - "nexbox,a1" (Meson gxm s912)
> +
> +Amlogic Meson GX SoCs Information
> +----------------------------------
> +
> +The Meson SoCs have a Product Register that allows to retrieve SoC type,
> +package and revision information. If present, a device node for this register
> +should be added.
> +
> +Required properties:
> +  - compatible: For Meson GX SoCs, must be "amlogic,meson-gx-socinfo".
> +  - reg: Base address and length of the register block.
> +
> +Examples
> +--------
> +
> +       chipid@220 {
> +               compatible = "amlogic,meson-gx-socinfo";
> +               reg = <0x0 0x00220 0x0 0x4>;
> +       };
> +

The register location would hint that this is in the middle of some block of
random registers, i.e. a syscon or some unrelated device.

Are you sure that "socinfo" is the actual name of the IP block and that
it only has a single 32-bit register?

     Arnd