linux-kernel - Re: [PATCH v2 2/3] dt-bindings: soc: add loongson-2 pm

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Date:   Mon, 22 May 2023 13:47:37 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Yinbo Zhu <zhuyinbo@...ngson.cn>
CC:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Marc Zyngier <maz@...nel.org>,
        Youling Tang <tangyouling@...ngson.cn>,
        Baoqi Zhang <zhangbaoqi@...ngson.cn>,
        Arnd Bergmann <arnd@...db.de>, Yun Liu <liuyun@...ngson.cn>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <loongarch@...ts.linux.dev>,
        Jianmin Lv <lvjianmin@...ngson.cn>,
        <wanghongliang@...ngson.cn>, Liu Peibao <liupeibao@...ngson.cn>,
        <loongson-kernel@...ts.loongnix.cn>
Subject: Re: [PATCH v2 2/3] dt-bindings: soc: add loongson-2 pm

Hey!

On Mon, May 22, 2023 at 05:31:55PM +0800, Yinbo Zhu wrote:
> Add the Loongson-2 SoC Power Management Controller binding with DT
> schema format using json-schema.

Grabbing thread from lore.kernel.org/all/20230522093156.7108-3-zhuyinbo%40loongson.cn/t.mbox.gz
Checking for newer revisions
Grabbing search results from lore.kernel.org
Analyzing 3 messages in the thread
Checking attestation on all messages, may take a moment...
---
  [PATCH v2 1/3] loongarch: export loongarch pm interface
    + Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
  [PATCH v2 2/3] dt-bindings: soc: add loongson-2 pm
    + Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
  ERROR: missing [3/3]!
---
Total patches: 2
---
WARNING: Thread incomplete!
Applying: loongarch: export loongarch pm interface
Applying: dt-bindings: soc: add loongson-2 pm

Looks like the user for these bindings got lost somewhere along the way?
Please make sure to keep a series threaded.

> 
> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
> ---
>  .../soc/loongson/loongson,ls2k-pmc.yaml       | 51 +++++++++++++++++++
>  MAINTAINERS                                   |  6 +++
>  2 files changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/loongson/loongson,ls2k-pmc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/loongson/loongson,ls2k-pmc.yaml b/Documentation/devicetree/bindings/soc/loongson/loongson,ls2k-pmc.yaml
> new file mode 100644
> index 000000000000..ddad62889c60
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/loongson/loongson,ls2k-pmc.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/loongson/loongson,ls2k-pmc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Loongson-2 Power Manager controller
> +
> +maintainers:
> +  - Yinbo Zhu <zhuyinbo@...ngson.cn>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - loongson,ls2k-pmc
> +      - const: syscon
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  suspend-address:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      The "suspend-address" is a deep sleep state (Suspend To RAM)
> +      firmware entry address which was jumped from kernel and it's
> +      value was dependent on specific platform firmware code. In
> +      addition, the PM need according to it to indicate that current
> +      SoC whether support Suspend To RAM.

I (still) think this property is rather odd, maybe I am just not really
understanding the property as it seems to be described partly in terms
of operating system behaviour rather than its actual function. "was
jumped from kernel" I don't get.

The whole setup here seems a bit odd, but that's for the loongson arch
folks reviewing the actual code to comment on!

Thanks,
Conor.

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