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

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Message-ID: <20191016083748.GA2288@Mani-XPS-13-9360>
Date:   Wed, 16 Oct 2019 14:07:48 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Rob Herring <robh@...nel.org>
Cc:     mchehab@...nel.org, sakari.ailus@....fi,
        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
Subject: Re: [PATCH 1/2] dt-bindings: media: i2c: Add IMX296 CMOS sensor
 binding

Hi Rob,

On Tue, Oct 15, 2019 at 05:45:54PM -0500, Rob Herring wrote:
> On Fri, Oct 11, 2019 at 09:26:12AM +0530, Manivannan Sadhasivam wrote:
> > Add devicetree binding for IMX296 CMOS image sensor.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >  .../devicetree/bindings/media/i2c/imx296.txt  | 55 +++++++++++++++++++
> >  1 file changed, 55 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/i2c/imx296.txt
> 
> You should know by now, use DT schema format please.
> 

I know for other subsystems but by having a vague look at the existing bindings
I thought media subsystem is still using .txt. But I now see few yaml bindings
in linux-next and will switch over this.

Btw, is it mandatory now to use YAML bindings for all subsystems? I don't
see any issue (instead I prefer) but I remember that you defer to the preference
of the subsystem maintainers before!

> > diff --git a/Documentation/devicetree/bindings/media/i2c/imx296.txt b/Documentation/devicetree/bindings/media/i2c/imx296.txt
> > new file mode 100644
> > index 000000000000..25d3b15162c1
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/imx296.txt
> > @@ -0,0 +1,55 @@
> > +* Sony IMX296 1/2.8-Inch CMOS Image Sensor
> > +
> > +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).
> > +
> > +Required Properties:
> > +- compatible: Should be "sony,imx296"
> > +- reg: I2C bus address of the device
> > +- clocks: Reference to the mclk clock.
> > +- clock-names: Should be "mclk".
> > +- clock-frequency: Frequency of the mclk clock in Hz.
> > +- vddo-supply: Interface power supply.
> > +- vdda-supply: Analog power supply.
> > +- vddd-supply: Digital power supply.
> > +
> > +Optional Properties:
> > +- reset-gpios: Sensor reset GPIO
> > +
> > +The imx296 device node should contain one 'port' child node with
> > +an 'endpoint' subnode. For further reading on port node refer to
> > +Documentation/devicetree/bindings/media/video-interfaces.txt.
> > +
> > +Required Properties on endpoint:
> > +- data-lanes: check ../video-interfaces.txt
> 
> This should only be required when not using all the lanes on the device.
> 

This is a bit weird! How will someone know how many lanes the device is using
by looking at the binding? He can anyway refer the datasheet but still...

> > +- remote-endpoint: check ../video-interfaces.txt
> 
> Don't really need to document this.
> 

okay.

Thanks,
Mani

> > +
> > +Example:
> > +	&i2c1 {
> > +		...
> > +		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 GCC_CAMSS_MCLK0_CLK>;
> > +			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 {
> > +					data-lanes = <1>;
> > +					remote-endpoint = <&csiphy0_ep>;
> > +				};
> > +			};
> > +		};
> > -- 
> > 2.17.1
> >