linux-kernel - Re: [PATCH v2] dt-bindings: display: atmel,lcdc: convert to dtschema

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Message-ID: <ce1c5ba1-4f6a-4d20-8a12-fbae9003657a@linaro.org>
Date: Mon, 4 Mar 2024 08:36:14 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Dharma Balasubiramani <dharma.b@...rochip.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+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Nicolas Ferre <nicolas.ferre@...rochip.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Claudiu Beznea <claudiu.beznea@...on.dev>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dt-bindings: display: atmel,lcdc: convert to dtschema

On 04/03/2024 06:36, Dharma Balasubiramani wrote:
> Convert the atmel,lcdc bindings to DT schema.
> Changes during conversion: add missing clocks and clock-names properties.
> 
> Signed-off-by: Dharma Balasubiramani <dharma.b@...rochip.com>
> ---
> This patch converts the existing lcdc display text binding to JSON schema.
> The binding is split into two namely
> lcdc.yaml
> - Holds the frame buffer properties
> lcdc-display.yaml
> - Holds the display panel properties which is a phandle to the display
> property in lcdc fb node.
> 
> These bindings are tested against the existing at91 dts files using
> dtbs_check.
> ---
> Changes in v2:
> - Run checkpatch and remove whitespace errors.
> - Add the standard interrupt flags.
> - Split the binding into two, namely lcdc.yaml and lcdc-display.yaml.
> - Link to v1: https://lore.kernel.org/r/20240223-lcdc-fb-v1-1-4c64cb6277df@microchip.com
> ---
>  .../bindings/display/atmel,lcdc-display.yaml       | 98 ++++++++++++++++++++++
>  .../devicetree/bindings/display/atmel,lcdc.txt     | 87 -------------------
>  .../devicetree/bindings/display/atmel,lcdc.yaml    | 70 ++++++++++++++++
>  3 files changed, 168 insertions(+), 87 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/atmel,lcdc-display.yaml b/Documentation/devicetree/bindings/display/atmel,lcdc-display.yaml
> new file mode 100644
> index 000000000000..ea4fd34b9e2c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/atmel,lcdc-display.yaml
> @@ -0,0 +1,98 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/atmel,lcdc-display.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip's LCDC Display
> +
> +maintainers:
> +  - Nicolas Ferre <nicolas.ferre@...rochip.com>
> +  - Dharma Balasubiramani <dharma.b@...rochip.com>
> +
> +description:
> +  The LCD Controller (LCDC) consists of logic for transferring LCD image data
> +  from an external display buffer to a TFT LCD panel. The LCDC has one display
> +  input buffer per layer that fetches pixels through the single bus host
> +  interface and a look-up table to allow palletized display configurations. The
> +  LCDC is programmable on a per layer basis, and supports different LCD
> +  resolutions, window sizes, image formats and pixel depths.
> +
> +# We need a select here since this schema is applicable only for nodes with the
> +# following properties
> +
> +select:
> +  anyOf:
> +    - required: [ 'atmel,dmacon' ]
> +    - required: [ 'atmel,lcdcon2' ]
> +    - required: [ 'atmel,guard-time' ]
> +    - required: [ bits-per-pixel ]

Why quotes in other places? bits-per-pixel is generic property, so you
are now selecting other bindings. Read carefully what Rob wrote.


Best regards,
Krzysztof