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

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Message-ID: <3d4e4b18-5318-4f1c-ab05-b925a0dfd317@microchip.com>
Date: Mon, 4 Mar 2024 09:28:57 +0000
From: <Dharma.B@...rochip.com>
To: <krzysztof.kozlowski@...aro.org>, <maarten.lankhorst@...ux.intel.com>,
	<mripard@...nel.org>, <tzimmermann@...e.de>, <airlied@...il.com>,
	<daniel@...ll.ch>, <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
	<conor+dt@...nel.org>, <Nicolas.Ferre@...rochip.com>,
	<alexandre.belloni@...tlin.com>, <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 04/03/24 1:06 pm, Krzysztof Kozlowski wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> 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? 

I got the following warnings when I tried to compile without adding the 
quotes for atmel,*

"[warning] too few spaces after comma (commas)"

and when I add quotes for "bits-per-pixel" it complained the following

"[error] string value is redundantly quoted with any quotes 
(quoted-strings)"

So I added quotes for properties with comma in them.

> bits-per-pixel is generic property, so you
> are now selecting other bindings. Read carefully what Rob wrote.

My bad, I should have inquired before arriving at any conclusion.
Thanks for letting me know.

Shall I send v3 by removing "- required: [ bits-per-pixel ]" in select?

> 
> 
> Best regards,
> Krzysztof
> 

-- 
With Best Regards,
Dharma B.