linux-kernel - Re: [PATCH 1/3] dt-bindings: display: bridge: add sam9x7-lvds compatible

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Message-ID: <20240122-privacy-preschool-27dc7dcc5529@spud>
Date: Mon, 22 Jan 2024 16:37:36 +0000
From: Conor Dooley <conor@...nel.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Dharma Balasubiramani <dharma.b@...rochip.com>,
	manikandan.m@...rochip.com, andrzej.hajda@...el.com,
	neil.armstrong@...aro.org, rfoss@...nel.org,
	Laurent.pinchart@...asonboard.com, jonas@...boo.se,
	jernej.skrabec@...il.com, airlied@...il.com, daniel@...ll.ch,
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
	tzimmermann@...e.de, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux4microchip@...rochip.com
Subject: Re: [PATCH 1/3] dt-bindings: display: bridge: add sam9x7-lvds
 compatible

On Mon, Jan 22, 2024 at 04:51:16PM +0100, Krzysztof Kozlowski wrote:
> On 22/01/2024 09:29, Dharma Balasubiramani wrote:
> > Add the 'sam9x7-lvds' compatible binding, which describes the
> > Low Voltage Differential Signaling (LVDS) Controller found on Microchip's
> > sam9x7 series System-on-Chip (SoC) devices. This binding will be used to
> > define the properties and configuration for the LVDS Controller in DT.
> > 
> > Signed-off-by: Dharma Balasubiramani <dharma.b@...rochip.com>
> > ---
> >  .../display/bridge/microchip,sam9x7-lvds.yaml | 59 +++++++++++++++++++
> >  1 file changed, 59 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/microchip,sam9x7-lvds.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/display/bridge/microchip,sam9x7-lvds.yaml b/Documentation/devicetree/bindings/display/bridge/microchip,sam9x7-lvds.yaml
> > new file mode 100644
> > index 000000000000..8c2c5b858c85
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/microchip,sam9x7-lvds.yaml
> > @@ -0,0 +1,59 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/display/bridge/microchip,sam9x7-lvds.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Microchip SAM9X7 LVDS Controller
> 
> What is the "X"?
> 
> > +
> > +maintainers:
> > +  - Dharma Balasubiramani <dharma.b@...rochip.com>
> > +
> > +description: |
> 
> Do not need '|' unless you need to preserve formatting.
> 
> > +  The Low Voltage Differential Signaling Controller (LVDSC) manages data
> > +  format conversion from the LCD Controller internal DPI bus to OpenLDI
> > +  LVDS output signals. LVDSC functions include bit mapping, balanced mode
> > +  management, and serializer.
> > +
> > +properties:
> > +  compatible:
> > +    const: microchip,sam9x7-lvds
> 
> What is "x"? Wildcard? Then no, don't use it and instead use proper SoC
> version number.

These SoCs actually do have an x in their name. However, and I do always
get confused here, the sam9x7 is a series of SoCs (the cover letter does
say this) rather than a specific device.
I think the series current consists of a sam9x70 sam9x72 and a sam9x75.
The devices are largely similar, but I am not sure if the sam9x70
supports LVDS at all. Having a compatible for the series does not seem
correct to me.

Cheers,
Conor.

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