linux-kernel - Re: [PATCH 1/2] dt-bindings: display: bridge: Add schema for Synopsys DW HDMI QP TX IP

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Message-ID: <ba957155-7a0d-4c88-8326-a1d4d20e4656@kernel.org>
Date: Thu, 1 Aug 2024 10:38:41 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
 Andrzej Hajda <andrzej.hajda@...el.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Heiko Stübner <heiko@...ech.de>,
 Andy Yan <andy.yan@...k-chips.com>, Alexandre ARNOUD <aarnoud@...com>,
 Luis de Arquer <ldearquer@...il.com>
Subject: Re: [PATCH 1/2] dt-bindings: display: bridge: Add schema for Synopsys
 DW HDMI QP TX IP

On 01/08/2024 04:05, Cristian Ciocaltea wrote:
> Add dt-binding schema containing the common properties for the Synopsys
> DesignWare HDMI QP TX controller.
> 
> Note this is not a full dt-binding specification, but is meant to be
> referenced by platform-specific bindings for this IP core.

Please provide an user for this binding. Otherwise it is a no-op.

> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
>  .../display/bridge/synopsys,dw-hdmi-qp.yaml        | 66 ++++++++++++++++++++++
>  1 file changed, 66 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/synopsys,dw-hdmi-qp.yaml b/Documentation/devicetree/bindings/display/bridge/synopsys,dw-hdmi-qp.yaml
> new file mode 100644
> index 000000000000..d8aee12b121d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/synopsys,dw-hdmi-qp.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/synopsys,dw-hdmi-qp.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Common Properties for Synopsys DesignWare HDMI QP TX Controller IP
> +
> +maintainers:
> +  - Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> +
> +description: |
> +  This document defines device tree properties for the Synopsys DesignWare
> +  HDMI 2.1 Quad-Pixel (QP) TX controller IP core.
> +  It doesn't constitute a device tree binding specification by itself, but
> +  is meant to be referenced by platform-specific device tree bindings.
> +
> +  When referenced from platform device tree bindings, the properties defined
> +  in this document are defined as follows. The platform device tree bindings
> +  are responsible for defining whether each property is required or optional.

Drop this all description and re-write it not to say what bindings are
or are not. Describe the hardware.

> +
> +properties:
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    minItems: 4
> +    maxItems: 6
> +    items:
> +      - description: Peripheral/APB bus clock
> +      - description: EARC RX biphase clock
> +      - description: Reference clock
> +      - description: Audio interface clock
> +    additionalItems: true

??? What's the point of such common schema if it is not common at all?

> +
> +  clock-names:
> +    minItems: 4
> +    maxItems: 6
> +    items:
> +      - const: pclk
> +      - const: earc
> +      - const: ref
> +      - const: aud
> +    additionalItems: true
> +
> +  interrupts:
> +    minItems: 4
> +    maxItems: 5
> +    items:
> +      - description: AVP Unit interrupt
> +      - description: CEC interrupt
> +      - description: eARC RX interrupt
> +      - description: Main Unit interrupt
> +    additionalItems: true
> +
> +  interrupt-names:
> +    minItems: 4
> +    maxItems: 5
> +    items:
> +      - const: avp
> +      - const: cec
> +      - const: earc
> +      - const: main
> +    additionalItems: true

Sorry, there is no user of this and nothing here is actually common
except first entries in clocks and interrupts properties.

I don't see any benefit of this.

Best regards,
Krzysztof