linux-kernel - Re: [PATCH v6 5/6] media: dt-bindings: mt9p031: Convert bindings to yaml

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Date:   Mon, 19 Jul 2021 06:45:05 +0000
From:   Stefan Riedmüller <S.Riedmueller@...tec.de>
To:     "robh@...nel.org" <robh@...nel.org>
CC:     "mchehab@...nel.org" <mchehab@...nel.org>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "sakari.ailus@...ux.intel.com" <sakari.ailus@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 5/6] media: dt-bindings: mt9p031: Convert bindings to
 yaml

Hi Rob,

On Fri, 2021-07-16 at 13:23 -0600, Rob Herring wrote:
> On Wed, Jul 14, 2021 at 03:38:48PM +0200, Stefan Riedmueller wrote:
> > Convert mt9p031 sensor bindings to yaml schema. Also update the
> > MAINTAINERS entry.
> > 
> > Although input-clock-frequency and pixel-clock-frequency have not been
> > definded as endpoint propierties in the textual bindings, the sensor
> > does parse them from the endpoint. Thus move these properties to the
> > endpoint in the new yaml bindings.
> > 
> > Signed-off-by: Stefan Riedmueller <s.riedmueller@...tec.de>
> > ---
> >  .../bindings/media/i2c/aptina,mt9p031.yaml    | 92 +++++++++++++++++++
> >  .../devicetree/bindings/media/i2c/mt9p031.txt | 40 --------
> >  MAINTAINERS                                   |  1 +
> >  3 files changed, 93 insertions(+), 40 deletions(-)
> >  create mode 100644
> > Documentation/devicetree/bindings/media/i2c/aptina,mt9p031.yaml
> >  delete mode 100644
> > Documentation/devicetree/bindings/media/i2c/mt9p031.txt
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/media/i2c/aptina,mt9p031.yaml
> > b/Documentation/devicetree/bindings/media/i2c/aptina,mt9p031.yaml
> > new file mode 100644
> > index 000000000000..1531ecd1ed95
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/aptina,mt9p031.yaml
> > @@ -0,0 +1,92 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/i2c/aptina,mt9p031.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Aptina 1/2.5-Inch 5Mp CMOS Digital Image Sensor
> > +
> > +maintainers:
> > +  - Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > +
> > +description: |
> > +  The Aptina MT9P031 is a 1/2.5-inch CMOS active pixel digital image
> > sensor
> > +  with an active array size of 2592H x 1944V. It is programmable through
> > a
> > +  simple two-wire serial interface.
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - aptina,mt9p031
> > +      - aptina,mt9p031m
> > +
> > +  reg:
> > +    description: I2C device address
> > +    maxItems: 1
> > +
> > +  reset-gpios:
> > +    maxItems: 1
> > +    description: Chip reset GPIO
> > +
> > +  port:
> > +    $ref: /schemas/graph.yaml#/$defs/port-base
> > +    additionalProperties: false
> > +
> > +    properties:
> > +      endpoint:
> > +        $ref: /schemas/media/video-interfaces.yaml#
> > +        unevaluatedProperties: false
> > +
> > +        properties:
> > +          input-clock-frequency:
> > +            $ref: /schemas/types.yaml#/definitions/uint32
> > +            minimum: 6000000
> > +            maximum: 96000000
> > +            description: Input clock frequency
> > +
> > +          pixel-clock-frequency:
> > +            $ref: /schemas/types.yaml#/definitions/uint32
> > +            maximum: 96000000
> > +            description: Target pixel clock frequency
> > +
> > +          bus-type:
> > +            const: 5
> > +
> > +          bus-width:
> > +            const: 12
> 
> If there's only 1 possible setting for both of these, why do they need 
> to be in DT?

My idea was to have them here as constraints in case someone wants to add them
to although there is no actual need to. That's why I added them optional. But
to be honest, I wasn't sure if that's the correct approach, so if you'd prefer
to drop them then it's fine with me.

Regards,
Stefan



> 
> Rob