Re: [PATCH v2 2/5] dt-bindings: media: document SK Hynix Hi-846 MIPI CSI-2 8M pixel sensor
From: Laurent Pinchart
Date: Wed Jun 02 2021 - 10:06:29 EST
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@xxxxxxx>
>
> 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@xxxxxxx>
> > +
> > +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 = <®_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