linux-kernel - Re: [PATCH 1/2] dt-bindings: MIPS: Add doc about Ingenic CPU node.

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Date:   Mon, 25 Feb 2019 10:17:05 -0600
From:   Rob Herring <robh@...nel.org>
To:     Zhou Yanjie <zhouyanjie@...o.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, paul.burton@...s.com,
        ralf@...ux-mips.org, jhogan@...nel.org, ezequiel@...labora.co.uk,
        paul@...pouillou.net, mark.rutland@....com, syq@...ian.org,
        jiaxun.yang@...goat.com, 772753199@...com, ulf.hansson@...aro.org,
        malat@...ian.org
Subject: Re: [PATCH 1/2] dt-bindings: MIPS: Add doc about Ingenic CPU node.

On Wed, Jan 30, 2019 at 09:14:03PM +0800, Zhou Yanjie wrote:
> Dt-bindings doc about CPU node of Ingenic XBurst based SOCs.
> 
> Signed-off-by: Zhou Yanjie <zhouyanjie@...o.com>
> ---
>  .../devicetree/bindings/mips/ingenic/ingenic,cpu.txt    | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt
> 
> diff --git a/Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt b/Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt
> new file mode 100644
> index 0000000..38e3cd3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mips/ingenic/ingenic,cpu.txt
> @@ -0,0 +1,17 @@
> +Ingenic Soc CPU
> +
> +Required properties:
> +- device_type: Must be "cpu".
> +- compatible: One of:
> +  - "ingenic,xburst".

Only 1 version?

Is everything else discoverable or implied by this? Cache sizes, 
instruction set features, bugs, etc.?

> +- reg: The number of the CPU.

Ideally, this should be based on some h/w id, but generally only SMP 
processors have that.

BTW, is SMP supported? If so, you need to define how secondary cores get 
booted (unless that is standard and implied).

> +- next-level-cache: If there is a next level cache, point to it.
> +
> +Example:
> +cpu0: cpu@0 {
> +	device_type = "cpu";
> +	compatible = "ingenic,xburst";
> +	reg = <0>;
> +	next-level-cache = <&l2c>;
> +};
> +
> -- 
> 2.7.4
> 
>