linux-kernel - Re: [PATCH 2/3] dt-bindings: arm: mediatek: convert PCIESYS to the json-schema

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Date: Tue, 23 Jan 2024 12:20:29 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Rafał Miłecki <zajec5@...il.com>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Matthias Brugger <matthias.bgg@...il.com>, devicetree@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Rafał Miłecki <rafal@...ecki.pl>,
 Russell King <linux@...linux.org.uk>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/3] dt-bindings: arm: mediatek: convert PCIESYS to the
 json-schema

Il 23/01/24 09:20, Rafał Miłecki ha scritto:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> This helps validating DTS files. Introduced changes:
> 1. Documented "reg" property
> 2. Adjusted "reg" in example
> 
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
>   .../arm/mediatek/mediatek,mt7622-pciesys.yaml | 47 +++++++++++++++++++
>   .../arm/mediatek/mediatek,pciesys.txt         | 25 ----------
>   2 files changed, 47 insertions(+), 25 deletions(-)
>   create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pciesys.yaml
>   delete mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,pciesys.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pciesys.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pciesys.yaml
> new file mode 100644
> index 000000000000..7340a2512402
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pciesys.yaml

I think that we should really move all those clock controller yaml files to their
proper directory, which would be

Documentation/devicetree/bindings/clock/

..because those are clock controllers anyway and the fact that they do also
provide a reset controller doesn't really justify having them in arm/mediatek.

Besides, I would appreciate if you could also move mt8186/92/95 and eventual
others that are there to clock/.

> @@ -0,0 +1,47 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/mediatek/mediatek,mt7622-pciesys.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek PCIESYS controller
> +
> +description:
> +  The MediaTek PCIESYS controller provides various clocks to the system.
> +
> +maintainers:
> +  - Matthias Brugger <matthias.bgg@...il.com>
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - mediatek,mt7622-pciesys
> +          - mediatek,mt7629-pciesys
> +      - const: syscon

I know that there's syscon all over the place and, even if I admit I didn't check,
I am fairly sure that there's absolutely no reason to have syscon there, and that
the syscon compatible never did anything for (most of, or all of) those clock
controllers, at all.

I'm not sure - though - if removing syscon during the txt->yaml conversion is
acceptable (yeah we'd be cheating a bit), but something makes me say it is, because
the bindings couldn't validate before that one as well.

Of course you'd have to remove the syscon compatible from the affected device trees
as well as omitting it here.

However, to be sure that we're doing the right thing here, I have to summon someone
that can actually give a definitive answer to what I just said.....

Krzysztof, please? :-)

> +
> +  reg:
> +    maxItems: 1
> +
> +  "#clock-cells":
> +    const: 1
> +    description: The available clocks are defined in dt-bindings/clock/mt*-clk.h
> +
> +  "#reset-cells":
> +    const: 1
> +
> +required:
> +  - reg
> +  - "#clock-cells"
> +  - "#reset-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    pciesys@...00800 {

This is a clock controller, so it is clock-controller@...00800

> +        compatible = "mediatek,mt7622-pciesys", "syscon";
> +        reg = <0x1a100800 0x1000>;
> +        #clock-cells = <1>;
> +        #reset-cells = <1>;
> +    };
> diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,pciesys.txt b/Documentation/devicetree/bindings/arm/mediatek/mediatek,pciesys.txt
> deleted file mode 100644
> index d179a61536f4..000000000000
> --- a/Documentation/devicetree/bindings/arm/mediatek/mediatek,pciesys.txt
> +++ /dev/null
> @@ -1,25 +0,0 @@
> -MediaTek PCIESYS controller
> -============================
> -
> -The MediaTek PCIESYS controller provides various clocks to the system.
> -
> -Required Properties:
> -
> -- compatible: Should be:
> -	- "mediatek,mt7622-pciesys", "syscon"
> -	- "mediatek,mt7629-pciesys", "syscon"
> -- #clock-cells: Must be 1
> -- #reset-cells: Must be 1
> -
> -The PCIESYS controller uses the common clk binding from
> -Documentation/devicetree/bindings/clock/clock-bindings.txt
> -The available clocks are defined in dt-bindings/clock/mt*-clk.h.
> -
> -Example:
> -
> -pciesys: pciesys@...00800 {
> -	compatible = "mediatek,mt7622-pciesys", "syscon";
> -	reg = <0 0x1a100800 0 0x1000>;
> -	#clock-cells = <1>;
> -	#reset-cells = <1>;
> -};