linux-kernel - Re: [PATCH v2 2/5] dt-bindings: media: document SK Hynix Hi-846 MIPI CSI-2 8M pixel sensor

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Message-ID: <YLeQGjDdTX0iohZ0@pendragon.ideasonboard.com>
Date:   Wed, 2 Jun 2021 17:05:14 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     Martin Kepplinger <martin.kepplinger@...i.sm>, mchehab@...nel.org,
        devicetree@...r.kernel.org, kernel@...i.sm,
        krzysztof.kozlowski@...onical.com, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, paul.kocialkowski@...tlin.com,
        robh@...nel.org, shawnx.tu@...el.com
Subject: Re: [PATCH v2 2/5] dt-bindings: media: document SK Hynix Hi-846 MIPI
 CSI-2 8M pixel sensor

On Wed, Jun 02, 2021 at 04:51:37PM +0300, Sakari Ailus wrote:
> Hi Martin,
> 
> On Fri, May 28, 2021 at 10:13:33AM +0200, Martin Kepplinger wrote:
> > Document the bindings used for the SK Hynix Hi-846 CMOS camera driver.
> > 
> > Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
> 
> Could you read Documentation/driver-api/media/camera-sensor.rst, please?
> 
> I believe you'll need assigned-clock-rates device property as well as

I dn't think assigned-clock-rates should be part of the bindings, it's a
mechanism that can be used in any DT device node.

> link-frequencies endpoint property.
> 
> > ---
> >  .../bindings/media/i2c/hynix,hi846.yaml       | 99 +++++++++++++++++++
> >  1 file changed, 99 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/media/i2c/hynix,hi846.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/media/i2c/hynix,hi846.yaml b/Documentation/devicetree/bindings/media/i2c/hynix,hi846.yaml
> > new file mode 100644
> > index 000000000000..2991108e23e5
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/i2c/hynix,hi846.yaml
> > @@ -0,0 +1,99 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/i2c/hynix,hi846.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: SK Hynix Hi-846 1/4" 8M Pixel MIPI CSI-2 sensor
> > +
> > +maintainers:
> > +  - Martin Kepplinger <martin.kepplinger@...i.sm>
> > +
> > +description: |-
> > +  The Hi-846 is a raw image sensor with an MIPI CSI-2 image data
> > +  interface and CCI (I2C compatible) control bus. The output format
> > +  is 10bit Bayer.
> 
> Virtually all Bayer sensors can do 8 bpp, too. I'd drop the sentence

Not this one according to its datasheet (we can't rule out that this
would be possible an undocumented of course).

> mentoning 10 bits.
> 
> > +
> > +properties:
> > +  compatible:
> > +    const: hynix,hi846
> > +
> > +  reg:
> > +    description: I2C device address.
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    description: Reference to the mclk clock.
> > +    maxItems: 1
> > +
> > +  clock-names:
> > +    const: mclk
> > +
> > +  rst-gpios:
> > +    description: Reference to the GPIO connected to the reset pin. Active low.
> > +    maxItems: 1
> > +
> > +  vdd-supply:
> > +    description: Definition of the regulator used as 1.8V digital power supply.
> > +
> > +  port:
> > +    $ref: /schemas/graph.yaml#/properties/port
> > +    additionalProperties: false
> > +
> > +    properties:
> > +      endpoint:
> > +        $ref: /schemas/media/video-interfaces.yaml#
> > +        unevaluatedProperties: false
> > +
> > +        properties:
> > +          data-lanes:
> > +            oneOf:
> > +              - items:
> > +                  - const: 1
> > +                  - const: 2
> > +                  - const: 3
> > +                  - const: 4
> > +              - items:
> > +                  - const: 1
> > +                  - const: 2
> > +
> > +        required:
> > +          - data-lanes
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - clocks
> > +  - clock-names
> > +  - rst-gpios
> > +  - vdd-supply
> > +  - port
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/gpio/gpio.h>
> > +
> > +    i2c {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        hi846: camera@20 {
> > +            compatible = "hynix,hi846";
> > +            reg = <0x20>;
> > +            clocks = <&clk>;
> > +            clock-names = "mclk";
> > +            vdd-supply = <&reg_camera_pwr_en>; /* 1.8v */
> > +            rst-gpios = <&gpio1 25 GPIO_ACTIVE_LOW>;
> > +
> > +            port {
> > +                camera_out: endpoint {
> > +                    remote-endpoint = <&csi1_ep1>;
> > +                    data-lanes = <1 2>;
> > +                };
> > +            };
> > +        };
> > +    };
> > +
> > +...

-- 
Regards,

Laurent Pinchart