Re: [PATCH v3 2/5] dt-bindings: media: document SK Hynix Hi-846 MIPI CSI-2 8M pixel sensor

Laurent Pinchart
2021-05-31T23:13:59Z

Hi Martin,

Thank you for the patch.

On Mon, May 31, 2021 at 02:07:34PM +0200, Martin Kepplinger wrote:
> Document the bindings used for the SK Hynix Hi-846 CMOS camera driver.
>
> Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
> ---
> .../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..26462f6b5e69
> --- /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@puri.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.
> +
> +properties:
> + compatible:
> + const: hynix,hi846
> +
> + reg:
> + maxItems: 1
> +
> + clocks:
> + items:
> + - description: Reference to the mclk clock.
> +
> + clock-names:
> + items:
> + - const: mclk
> +
> + reset-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

You can drop the additionalProperties, the graph schema has
unevaluatedProperties set to false already.

> +
> + 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
> + - reset-gpios

I'd keep the reset-gpios property optional, in case the signal is
hardwired.

I don't have access to the sensor datasheet, so I can't provide comments
on what may be missing. With the above two issues addressed,

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> + - 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 */
> + reset-gpios = <&gpio1 25 GPIO_ACTIVE_LOW>;
> +
> + port {
> + camera_out: endpoint {
> + remote-endpoint = <&csi1_ep1>;
> + data-lanes = <1 2>;
> + };
> + };
> + };
> + };
> +
> +...

--
Regards,

Laurent Pinchart