linux-kernel - Re: [PATCH 12/13] dt-bindings: power: mediatek: Add new MT8196 power domain

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Message-ID: <20250307-groovy-opalescent-spoonbill-cb569e@krzk-bin>
Date: Fri, 7 Mar 2025 08:41:28 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Guangjie Song <guangjie.song@...iatek.com>
Cc: Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Ulf Hansson <ulf.hansson@...aro.org>, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org, 
	Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 12/13] dt-bindings: power: mediatek: Add new MT8196 power
 domain

On Fri, Mar 07, 2025 at 11:44:36AM +0800, Guangjie Song wrote:
> Add the binding documentation for power domain on MediaTek MT8196.
> 
> Signed-off-by: Guangjie Song <guangjie.song@...iatek.com>
> ---
>  .../mediatek,mt8196-power-controller.yaml     | 74 +++++++++++++++++++
>  include/dt-bindings/power/mt8196-power.h      | 57 ++++++++++++++


You keep sending multiple patchsets and none of them are tested.


>  2 files changed, 131 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/mediatek,mt8196-power-controller.yaml
>  create mode 100644 include/dt-bindings/power/mt8196-power.h

Comments from other patches apply.

> 
> diff --git a/Documentation/devicetree/bindings/power/mediatek,mt8196-power-controller.yaml b/Documentation/devicetree/bindings/power/mediatek,mt8196-power-controller.yaml
> new file mode 100644
> index 000000000000..6c2867b25967
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/mediatek,mt8196-power-controller.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/mediatek,mt8196-power-controller.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mediatek MT8196 Power Domains Controller
> +
> +maintainers:
> +  - Guangjie Song <guangjie.song@...iatek.com>
> +
> +description: |
> +  Mediatek processors include support for multiple power domains which can be
> +  powered up/down by software based on different application scenes to save power.
> +
> +properties:
> +  $nodename:
> +    pattern: '^power-controller(@[0-9a-f]+)?$'


How unit address can be optional?

> +
> +  compatible:
> +    enum:
> +      - mediatek,mt8196-scpsys
> +      - mediatek,mt8196-hfrpsys
> +
> +  '#power-domain-cells':
> +    const: 1
> +
> +  reg:
> +    description: Address range of the power controller.

No, look how other bindings do it.

> +
> +  clocks:
> +    description: |

Look at other bindings.

> +      A number of phandles to clocks that need to be enabled during domain
> +      power-up sequencing.

Look at other bindings.

> +
> +  clock-names:
> +    description: |
> +      List of names of clock.
> +
> +  domain-supply:
> +    description: domain regulator supply.
> +
> +  spm:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: phandle to the device containing the spm register range.
> +
> +  mmpc:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: phandle to the device containing the mmpc register range.
> +
> +  vote-regmap:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: phandle to the device containing the vote register range.
> +
> +  mm-vote-regmap:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: phandle to the device containing the mm-vote register range.

None of these are correct.

> +
> +required:
> +  - compatible

That's just incomplete.

This binding is really incomplete and with multiple issues. Considering
this was never tested, please first consult some internal folks to do
proper internal review.

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/power/mt8196-power.h>
> +
> +    scpsys: power-controller@...04000 {
> +      compatible = "mediatek,mt8196-scpsys", "syscon";
> +      reg = <0 0x1c004000 0 0x1000>;
> +      #power-domain-cells = <1>;
> +      spm = <&scpsys_bus>;
> +      vote-regmap = <&vote>;
> +    };
> diff --git a/include/dt-bindings/power/mt8196-power.h b/include/dt-bindings/power/mt8196-power.h
> new file mode 100644
> index 000000000000..b0db89cc435d
> --- /dev/null
> +++ b/include/dt-bindings/power/mt8196-power.h
> @@ -0,0 +1,57 @@
> +/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
> +/*
> + * Copyright (c) 2023 MediaTek Inc.

We have 2025.

Best regards,
Krzysztof