Re: [PATCH v2 1/2] media: dt-bindings: alvium: add document YAML binding

[Tommaso Merciai <tomm.merciai@gmail.com>]

Hi Conor,
Thanks for the review.

On Fri, May 26, 2023 at 08:00:05PM +0100, Conor Dooley wrote:
> Hey Tommaso,
> 
> On Fri, May 26, 2023 at 07:39:43PM +0200, Tommaso Merciai wrote:
> > Add documentation of device tree in YAML schema for the ALVIUM
> > Camera from Allied Vision Inc.
> > 
> > References:
> >  - https://www.alliedvision.com/en/products/embedded-vision-solutions
> > 
> > Signed-off-by: Tommaso Merciai <tomm.merciai@gmail.com>
> > ---
> > Changes since v1:
> >  - Fixed build error as suggested by RHerring bot
> > 
> >  .../media/i2c/alliedvision,alvium.yaml        | 115 ++++++++++++++++++
> >  1 file changed, 115 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml
> > new file mode 100644
> > index 000000000000..81e9e560c99d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium.yaml
> > @@ -0,0 +1,115 @@
> > +# SPDX-License-Identifier: GPL-2.0
> 
> No dual license?

Yep, agree. Thanks.

> 
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/i2c/alliedvision,alvium.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Alliedvision Alvium Camera
> > +
> > +maintainers:
> > +  - Tommaso Merciai <tomm.merciai@gmail.com>
> > +  - Martin Hecht <martin.hecht@avnet.eu>
> > +
> > +allOf:
> > +  - $ref: /schemas/media/video-interface-devices.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    const: alliedvision,alvium
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    description: XCLK Input Clock
> 
> Description is a bit moot when you have the clock name and there's only
> one. No harm done I suppose.

Agree, we can drop description.

> 
> > +
> > +  clock-names:
> > +    const: xclk
> > +
> > +  powerdown-gpios:
> > +    maxItems: 1
> > +    description: >
> 
> You don't have any newlines, so you don't need a >

Thanks, I found the same ">" into ov5640 .yaml

> 
> > +      Reference to the GPIO connected to the powerdown pin, if any.
> > +
> > +  reset-gpios:
> > +    maxItems: 1
> > +    description: >
> > +      Reference to the GPIO connected to the reset pin, if any.
> > +
> > +  streamon-delay:
> > +    maxItems: 1
> > +    description: >
> > +      Delay before camera start capturing frames in us.
> > +
> > +  rotation:
> > +    enum:
> > +      - 0
> > +      - 180
> 
> Could style this as enum: [0, 180], but I don't mind which you do.

For now this property is unused.
I'll drop this.

> 
> > +  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
> > +          data-lanes:
> > +            minItems: 1
> > +            maxItems: 4
> > +          link-frequencies: true
> > +
> > +        required:
> > +          - data-lanes
> > +          - link-frequencies
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - clock-names
> > +  - port
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +      #include <dt-bindings/gpio/gpio.h>
> > +      #include <dt-bindings/clock/imx8mp-clock.h>
> > +
> > +      i2c {
> > +          #address-cells = <1>;
> > +          #size-cells = <0>;
> > +
> > +          camera: alvium@3c {
> 
> Label does not seem to be used & the generic node name should probably
> be "camera", no?

What about using: "alvium: camera@3c {" ?
Like in some .yaml of ov sensors?

> 
> > +              compatible = "alliedvision,alvium";
> > +              pinctrl-names = "default";
> > +              pinctrl-0 = <&pinctrl_csi0_pwn>, <&pinctrl_csi0_rst>, <&pinctrl_csi_mclk>;
> > +              reg = <0x3c>;
> > +              clocks = <&clk IMX8MP_CLK_IPP_DO_CLKO2>;
> > +              clock-names = "xclk";
> > +              assigned-clocks = <&clk IMX8MP_CLK_IPP_DO_CLKO2>;
> > +              assigned-clock-parents = <&clk IMX8MP_CLK_24M>;
> > +              assigned-clock-rates = <24000000>;
> > +              streamon-delay = <20>;
> > +              powerdown-gpios = <&gpio2 11 GPIO_ACTIVE_HIGH>;
> > +              reset-gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
> > +              status = "okay";
> > +
> > +              port {
> > +                  alvium_out: endpoint {
> 
> Ditto here, drop the unused label?

I think we need this.



Thanks!

Regards,
Tommaso

> 
> Otherwise, looks grand to me.
> 
> Cheers,
> Conor.
> 
> > +                      remote-endpoint = <&mipi_csi_0_in>;
> > +                      data-lanes = <1 2 3 4>;
> > +                      link-frequencies = /bits/ 64 <681250000>;
> > +                      clock-lanes = <0>;
> > +                  };
> > +              };
> > +          };
> > +      };
> > +
> > +...
> > -- 
> > 2.34.1
> >