linux-kernel - Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for Chipone ICN6211

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Message-ID: <YDZRFeuzsamKyIJo@pendragon.ideasonboard.com>
Date:   Wed, 24 Feb 2021 15:13:57 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-amarula <linux-amarula@...rulasolutions.com>
Subject: Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for
 Chipone ICN6211

Hi Jagan,

On Wed, Feb 24, 2021 at 06:07:43PM +0530, Jagan Teki wrote:
> On Mon, Feb 15, 2021 at 5:48 PM Laurent Pinchart wrote:
> > On Sun, Feb 14, 2021 at 11:22:10PM +0530, Jagan Teki wrote:
> > > ICN6211 is MIPI-DSI to RGB Convertor bridge from Chipone.
> > >
> > > It has a flexible configuration of MIPI DSI signal input and
> > > produce RGB565, RGB666, RGB888 output format.
> > >
> > > Add dt-bingings for it.
> > >
> > > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > > ---
> > > Changes for v3:
> > > - updated to new dt-bindings style
> > >
> > >  .../display/bridge/chipone,icn6211.yaml       | 90 +++++++++++++++++++
> > >  1 file changed, 90 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml
> > > new file mode 100644
> > > index 000000000000..13764f13fe46
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml
> > > @@ -0,0 +1,90 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/display/bridge/chipone,icn6211.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Chipone ICN6211 MIPI-DSI to RGB Converter bridge
> > > +
> > > +maintainers:
> > > +  - Jagan Teki <jagan@...rulasolutions.com>
> > > +
> > > +description: |
> > > +  ICN6211 is MIPI-DSI to RGB Convertor bridge from chipone.
> > > +
> > > +  It has a flexible configuration of MIPI DSI signal input and
> > > +  produce RGB565, RGB666, RGB888 output format.
> >
> > How does one select between the output formats ? Should the output
> > connection option be described in the device tree ?
> 
> I think that is a good option to select output formats via dts. what
> if it makes it a generic property like data-lanes? since it is common
> across many other bridges.

Describing the output connection in the device tree sounds like a good
idea indeed. The bus-width property could be used for this, maybe along
the lines of
https://lore.kernel.org/dri-devel/20201013020619.GG3942@pendragon.ideasonboard.com/.

If, for a given wiring of the output, different formats could be used,
then we would need to select them at runtime.

> > > +
> > > +properties:
> > > +  compatible:
> > > +    enum:
> > > +      - chipone,icn6211
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +    description: virtual channel number of a DSI peripheral
> > > +
> > > +  reset-gpios:
> > > +    description: GPIO connected for the reset pin
> > > +
> > > +  ports:
> > > +    $ref: /schemas/graph.yaml#/properties/ports
> > > +
> > > +    properties:
> > > +      port@0:
> > > +        $ref: /schemas/graph.yaml#/properties/port
> > > +        description:
> > > +          Video port for MIPI DSI input
> > > +
> > > +      port@1:
> > > +        $ref: /schemas/graph.yaml#/properties/port
> > > +        description:
> > > +          Video port for MIPI DPI output (panel or connector).
> > > +
> > > +    required:
> > > +      - port@0
> > > +      - port@1
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - reset-gpios
> > > +  - ports
> >
> > How about regulators ?
> 
> Will add it in the next version.

-- 
Regards,

Laurent Pinchart