linux-kernel - Re: [PATCH] dt-bindings: media: convert Mediatek consumer IR to the json-schema

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Message-ID: <62fca33c-eb1a-42ad-b7f7-31b14f0aa446@collabora.com>
Date: Wed, 24 Jan 2024 13:33:18 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Rafał Miłecki <zajec5@...il.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, 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>,
 Sean Wang <sean.wang@...iatek.com>, linux-media@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH] dt-bindings: media: convert Mediatek consumer IR to the
 json-schema

Il 24/01/24 10:52, Rafał Miłecki ha scritto:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> This helps validating DTS files. Introduced changes:
> 1. Reworded title
> 2. Added required #include-s and adjusted "reg" in example
> 
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
>   .../bindings/media/mediatek,mt7622-cir.yaml   | 81 +++++++++++++++++++
>   .../devicetree/bindings/media/mtk-cir.txt     | 28 -------
>   2 files changed, 81 insertions(+), 28 deletions(-)
>   create mode 100644 Documentation/devicetree/bindings/media/mediatek,mt7622-cir.yaml
>   delete mode 100644 Documentation/devicetree/bindings/media/mtk-cir.txt
> 
> diff --git a/Documentation/devicetree/bindings/media/mediatek,mt7622-cir.yaml b/Documentation/devicetree/bindings/media/mediatek,mt7622-cir.yaml
> new file mode 100644
> index 000000000000..a2d0eed33292
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/mediatek,mt7622-cir.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/mediatek,mt7622-cir.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mediatek consumer IR on-SoC controller

title: MediaTek Consumer Infrared Receiver on-SoC Controller

> +
> +maintainers:
> +  - Sean Wang <sean.wang@...iatek.com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt7622-cir
> +      - mediatek,mt7623-cir
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 1
> +    maxItems: 2
> +
> +  clock-names:
> +    minItems: 1
> +    items:
> +      - const: clk
> +      - const: bus

The driver says:

	ir->bus = devm_clk_get(dev, "bus");
	if (IS_ERR(ir->bus)) {
		/*
		 * For compatibility with older device trees try unnamed
		 * ir->bus uses the same clock as ir->clock.
		 */
		ir->bus = ir->clk;
	}

This makes me think that requiring *one* clock on MT7623 would be a mistake
and the devicetree should use clk, bus - CLK_INFRA_IRRX_PD, CLK_TOP_F10M_REF_SEL.

Seen that - I'm sure that setting maxItems: 1 on mediatek,mt7623-cir would as
well be a mistake.

> +
> +required:
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +
> +allOf:
> +  - $ref: rc.yaml#
> +  - if:

The solution would be to simply delete those if branches and, to keep compatibility
with the already present mt7623.dtsi file, keep min/max items to 1 and 2 (of course
in the case of clock-names, maxItems shall not be declared, as it's dictated by the
consts).

> +      properties:
> +        compatible:
> +          contains:
> +            const: mediatek,mt7622-cir
> +    then:
> +      properties:
> +        clocks:
> +          minItems: 2
> +
> +        clock-names:
> +          minItems: 2
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: mediatek,mt7623-cir
> +    then:
> +      properties:
> +        clocks:
> +          maxItems: 1
> +
> +        clock-names:
> +          maxItems: 1
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/mt2701-clk.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    ir@...13000 {

Please use a common generic name, as seen in gpio-ir-receiver.yaml and in
amlogic,meson6-ir.yaml:

ir-receiver@...13000 {

Cheers,
Angelo