linux-kernel - Re: [PATCH v3 1/2] dt-bindings: media: i2c: Add IMX296 CMOS sensor binding

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Date:   Tue, 29 Oct 2019 17:12:13 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, c.barrett@...mos.com,
        a.brela@...mos.com, peter.griffin@...aro.org
Subject: Re: [PATCH v3 1/2] dt-bindings: media: i2c: Add IMX296 CMOS sensor
 binding

On Mon, Oct 28, 2019 at 02:21:15PM +0200, Sakari Ailus wrote:
> Hi Manivannan,
> 
> Thanks for the update.
> 
> On Fri, Oct 25, 2019 at 11:29:07PM +0530, Manivannan Sadhasivam wrote:
> > Add YAML devicetree binding for IMX296 CMOS image sensor.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  .../devicetree/bindings/media/i2c/imx296.yaml | 98 +++++++++++++++++++
> >  1 file changed, 98 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/i2c/imx296.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/media/i2c/imx296.yaml b/Documentation/devicetree/bindings/media/i2c/imx296.yaml
> > new file mode 100644
> > index 000000000000..4e204fd7cf90
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/imx296.yaml
> > @@ -0,0 +1,98 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/i2c/imx296.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Sony IMX296 1/2.8-Inch CMOS Image Sensor
> > +
> > +maintainers:
> > +  - Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > +
> > +description: |-
> > +  The Sony IMX296 is a 1/2.9-Inch active pixel type CMOS Solid-state image
> > +  sensor with square pixel array and 1.58 M effective pixels. This chip
> > +  features a global shutter with variable charge-integration time. It is
> > +  programmable through I2C and 4-wire interfaces. The sensor output is
> > +  available via CSI-2 serial data output (1 Lane).
> > +
> > +properties:
> > +  compatible:
> > +    const: sony,imx296
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  clock-names:
> > +    description:
> > +      Input clock for the sensor.
> > +    items:
> > +      - const: mclk
> > +
> > +  clock-frequency:
> > +    description:
> > +      Frequency of the mclk clock in Hertz.
> > +    default: 37125000
> 
> I think you could omit the default.

Yes, there's no default if it is required.
 
> > +
> > +  vddo-supply:
> > +    description:
> > +      Definition of the regulator used as interface power supply.
> > +    maxItems: 1
> > +
> > +  vdda-supply:
> > +    description:
> > +      Definition of the regulator used as analog power supply.
> > +    maxItems: 1
> > +
> > +  vddd-supply:
> > +    description:
> > +      Definition of the regulator used as digital power supply.
> > +    maxItems: 1
> > +
> > +  reset-gpios:
> > +    description:
> > +      The phandle and specifier for the GPIO that controls sensor reset.
> > +    maxItems: 1
> > +
> > +  # See ../video-interfaces.txt for details

details on what?

> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - clock-names
> > +  - clock-frequency
> > +  - vddo-supply
> > +  - vdda-supply
> > +  - vddd-supply
> 
> I think the port and endpoint nodes should documented here as well.

port yes, but endpoint no. Unless you have endpoint properties other 
than remote-endpoint or reg.

> 
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/gpio/gpio.h>
> > +
> > +    imx296: camera-sensor@1a {
> > +        compatible = "sony,imx296";
> > +        reg = <0x1a>;
> > +        reset-gpios = <&msmgpio 35 GPIO_ACTIVE_LOW>;
> > +        pinctrl-names = "default";
> > +        pinctrl-0 = <&camera_rear_default>;
> > +        clocks = <&gcc 90>;
> > +        clock-names = "mclk";
> > +        clock-frequency = <37125000>;
> > +        vddo-supply = <&camera_vddo_1v8>;
> > +        vdda-supply = <&camera_vdda_3v3>;
> > +        vddd-supply = <&camera_vddd_1v2>;
> > +
> > +        port {
> > +            imx296_ep: endpoint {
> > +                remote-endpoint = <&csiphy0_ep>;
> > +            };
> > +        };
> > +    };
> > +
> > +...
> 
> -- 
> Regards,
> 
> Sakari Ailus