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References: <20220913160224.14951-1-prabhakar.mahadev-lad.rj@bp.renesas.com> <20220914214132.GA2173@tom-ThinkPad-T14s-Gen-2i>
In-Reply-To: <20220914214132.GA2173@tom-ThinkPad-T14s-Gen-2i>
From:   "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Date:   Fri, 16 Sep 2022 11:24:33 +0100
Message-ID: <CA+V-a8ufbsiz3p2n3LmYxES2aJYN9y8byF9bSyckNFz=fB-5LQ@mail.gmail.com>
Subject: Re: [PATCH] media: dt-bindings: ov5645: Convert OV5645 binding to a schema
To:     Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
Cc:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
        Sakari Ailus <sakari.ailus@linux.intel.com>,
        Hans Verkuil <hverkuil@xs4all.nl>, linux-media@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
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Hi Tommaso,

Thank you for the review.

On Wed, Sep 14, 2022 at 10:41 PM Tommaso Merciai
<tommaso.merciai@amarulasolutions.com> wrote:
>
> Hi Prabhakar,
>
> On Tue, Sep 13, 2022 at 05:02:24PM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> >
> > Convert the simple OV5645 Device Tree binding to json-schema.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> >  .../devicetree/bindings/media/i2c/ov5645.txt  |  54 --------
> >  .../bindings/media/i2c/ovti,ov5645.yaml       | 119 ++++++++++++++++++
> >  2 files changed, 119 insertions(+), 54 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/media/i2c/ov5645.txt
> >  create mode 100644 Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ov5645.txt b/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > deleted file mode 100644
> > index 72ad992f77be..000000000000
> > --- a/Documentation/devicetree/bindings/media/i2c/ov5645.txt
> > +++ /dev/null
> > @@ -1,54 +0,0 @@
> > -* Omnivision 1/4-Inch 5Mp CMOS Digital Image Sensor
> > -
> > -The Omnivision OV5645 is a 1/4-Inch CMOS active pixel digital image sensor with
> > -an active array size of 2592H x 1944V. It is programmable through a serial I2C
> > -interface.
> > -
> > -Required Properties:
> > -- compatible: Value should be "ovti,ov5645".
> > -- clocks: Reference to the xclk clock.
> > -- clock-names: Should be "xclk".
> > -- clock-frequency: Frequency of the xclk clock.
> > -- enable-gpios: Chip enable GPIO. Polarity is GPIO_ACTIVE_HIGH. This corresponds
> > -  to the hardware pin PWDNB which is physically active low.
> > -- reset-gpios: Chip reset GPIO. Polarity is GPIO_ACTIVE_LOW. This corresponds to
> > -  the hardware pin RESETB.
> > -- vdddo-supply: Chip digital IO regulator.
> > -- vdda-supply: Chip analog regulator.
> > -- vddd-supply: Chip digital core regulator.
> > -
> > -The device node must contain one 'port' child node for its digital output
> > -video port, in accordance with the video interface bindings defined in
> > -Documentation/devicetree/bindings/media/video-interfaces.txt.
> > -
> > -Example:
> > -
> > -     &i2c1 {
> > -             ...
> > -
> > -             ov5645: ov5645@3c {
> > -                     compatible = "ovti,ov5645";
> > -                     reg = <0x3c>;
> > -
> > -                     enable-gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
> > -                     reset-gpios = <&gpio5 20 GPIO_ACTIVE_LOW>;
> > -                     pinctrl-names = "default";
> > -                     pinctrl-0 = <&camera_rear_default>;
> > -
> > -                     clocks = <&clks 200>;
> > -                     clock-names = "xclk";
> > -                     clock-frequency = <24000000>;
> > -
> > -                     vdddo-supply = <&camera_dovdd_1v8>;
> > -                     vdda-supply = <&camera_avdd_2v8>;
> > -                     vddd-supply = <&camera_dvdd_1v2>;
> > -
> > -                     port {
> > -                             ov5645_ep: endpoint {
> > -                                     clock-lanes = <1>;
> > -                                     data-lanes = <0 2>;
> > -                                     remote-endpoint = <&csi0_ep>;
> > -                             };
> > -                     };
> > -             };
> > -     };
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml b/Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml
> > new file mode 100644
> > index 000000000000..7f407c988f87
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/ovti,ov5645.yaml
> > @@ -0,0 +1,119 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/i2c/ovti,ov5645.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: OmniVision OV5645 Image Sensor Device Tree Bindings
> > +
> > +maintainers:
> > +  - Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > +
> > +allOf:
> > +  - $ref: /schemas/media/video-interface-devices.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    const: ovti,ov5645
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    description: XCLK Input Clock
> > +
> > +  clock-names:
> > +    const: xclk
> > +
> > +  clock-frequency:
> > +    description: Frequency of the xclk clock in Hz.
> > +
> > +  vdda-supply:
> > +    description: Analog voltage supply, 2.8 volts
> > +
> > +  vddd-supply:
> > +    description: Digital core voltage supply, 1.5 volts
> > +
> > +  vdddo-supply:
> > +    description: Digital I/O voltage supply, 1.8 volts
> > +
> > +  enable-gpios:
> > +    maxItems: 1
> > +    description:
> > +      Reference to the GPIO connected to the PWDNB pin, if any.
> > +
> > +  reset-gpios:
> > +    maxItems: 1
> > +    description:
> > +      Reference to the GPIO connected to the RESETB pin, if any.
> > +
> > +  port:
> > +    description: Digital Output Port
> > +    $ref: /schemas/graph.yaml#/$defs/port-base
> > +    additionalProperties: false
> > +
> > +    properties:
> > +      endpoint:
> > +        $ref: /schemas/media/video-interfaces.yaml#
> > +        unevaluatedProperties: false
> > +
> > +        properties:
> > +          clock-lanes:
> > +            const: 0
> > +
> > +          bus-type:
> > +            const: 4
> > +
> > +          data-lanes:
> > +            minItems: 1
> > +            maxItems: 2
> > +            items:
> > +              enum: [1, 2]
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - clock-names
> > +  - clock-frequency
> > +  - vdda-supply
> > +  - vddd-supply
> > +  - vdddo-supply
> > +  - enable-gpios
> > +  - reset-gpios
> > +  - port
>
> I think we don't need all of these properties as required.
> The only "really" required are:
>
>   - compatible
>   - reg
>   - clocks
>   - port
>
Agreed, it's just the driver requirement hence the previous bindings
had marked them as required.

Cheers,
Prabhakar