linux-kernel - Re: [PATCH 1/3] dt-bindings: st7571-i2c: Add Sitronix ST7571 panel bindings

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Message-ID: <Z-5jhrwTfu4WMk5n@gmail.com>
Date: Thu, 3 Apr 2025 12:31:34 +0200
From: Marcus Folkesson <marcus.folkesson@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: st7571-i2c: Add Sitronix ST7571 panel
 bindings

Thank you Krzysztof,

I will fix the issues you pointed out, just a few comments below.

On Wed, Apr 02, 2025 at 10:27:53AM +0200, Krzysztof Kozlowski wrote:
> On Wed, Apr 02, 2025 at 08:12:10AM +0200, Marcus Folkesson wrote:
> > Sitronix ST7571 is a 4bit gray scale dot matrix LCD controller.
> > The controller has a SPI, I2C and 8bit parallel interface, this is for
> > the I2C interface only.
> > 
> > Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
> > ---
> >  .../bindings/display/sitronix,st7571-i2c.yaml      | 71 ++++++++++++++++++++++
> >  1 file changed, 71 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/sitronix,st7571-i2c.yaml b/Documentation/devicetree/bindings/display/sitronix,st7571-i2c.yaml
> > new file mode 100644
> > index 0000000000000000000000000000000000000000..6e5e0994a98db646a37bb17c4289332546c9266e
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/sitronix,st7571-i2c.yaml
> 

[...]

> 
> > +    maxItems: 1
> > +
> > +  sitronix,panel-width-mm:
> > +    description: physical panel width [mm]
> > +
> > +  sitronix,panel-height-mm:
> > +    description: physical panel height [mm]
> 
> No, use standard properties.

I will use width-mm and height-mm from panels.yaml from
panel-common.yaml instead

> 
> > +
> > +  sitronix,panel-nlines:
> > +    description: Number of lines in the panel
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    minimum: 1
> > +    maximum: 128
> > +    default: 128
> 
> Ditto

I will use vactive in panel-timing instead.

Do I need to specify those properties or should I just list them as
required?

Some bindings set e.g.

reg: true
reset-gpios: true

and others just list them as required.


> 
> > +
> > +  sitronix,panel-start-line:
> > +    description: Start line of the panel
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    minimum: 0
> > +    maximum: 127
> > +    default: 0
> 
> Ditto

I will use vfront-porch in panel-timing instead.


[...]
> 
> > +    i2c {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        display@3f {
> 
> Look how this is called in other bindings... The binding and example are
> not following existing code. Why? Why doing something entirely
> different?

Sorry, I'm not sure what you mean here.

> 
> Best regards,
> Krzysztof

Best regards,
Marcus Folkesson

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