Re: [PATCH v10 1/3] media: dt-bindings: ov8856: Document YAML bindings

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Hi Robert,

Thanks for the update.

On Tue, 2020-05-05 at 12:01 +0200, Robert Foss wrote:
> From: Dongchun Zhu <dongchun.zhu@xxxxxxxxxxxx>
> 
> This patch adds documentation of device tree in YAML schema for the
> OV8856 CMOS image sensor.
> 
> Signed-off-by: Dongchun Zhu <dongchun.zhu@xxxxxxxxxxxx>
> Signed-off-by: Robert Foss <robert.foss@xxxxxxxxxx>
> Reviewed-by: Maxime Ripard <mripard@xxxxxxxxxx>
> ---
> 
> - Changes since v9:
>   * Remove remote-endpoint property
>   * Marco: Make port property required again
>   * Sakari: Remove Ben as a maintainer
>   * Sakari: Replace data-lanes with const items
>   * Sakari: Remove clock-lanes property
>   * Sakari & Rob Herring: Change type of link-frequency
>     work around dt-schema bug
> 
> - Changes since v8:
>   * Maxime: Added r-b
> 
> - Changes since v7:
>   * Marco: Make 'port' property optional
>   * Maxime & Sakari: Add 'link-frequencies' property to dt binding
>   * robher: Improve description for 'port' property
> 
> - Changes since v6:
>   * Marco: remove qcom specifics from DT example
>    
> - Changes since v5:
>   * Add assigned-clocks and assigned-clock-rates
>   * robher: dt-schema errors
> 
> - Changes since v4:
>   * Fabio: Change reset-gpio to GPIO_ACTIVE_LOW, explain in description
>   * Add clock-lanes property to example
>   * robher: Fix syntax error in devicetree example
> 
> - Changes since v3:
>   * robher: Fix syntax error
>   * robher: Removed maxItems
>   * Fixes yaml 'make dt-binding-check' errors
> 
> - Changes since v2:
> 
> - Changes since v1:
>   Fixes comments from Sakari, Tomasz
>   * Add clock-frequency and link-frequencies in DT
> 
>  .../devicetree/bindings/media/i2c/ov8856.yaml | 142 ++++++++++++++++++
>  MAINTAINERS                                   |   1 +
>  2 files changed, 143 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov8856.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/ov8856.yaml b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml
> new file mode 100644
> index 000000000000..d6af685ad3ca
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml
> @@ -0,0 +1,142 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (c) 2019 MediaTek Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/ov8856.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Omnivision OV8856 CMOS Sensor Device Tree Bindings
> +
> +maintainers:
> +  - Dongchun Zhu <dongchun.zhu@xxxxxxxxxxxx>
> +
> +description: |-
> +  The Omnivision OV8856 is a high performance, 1/4-inch, 8 megapixel, CMOS
> +  image sensor that delivers 3264x2448 at 30fps. It provides full-frame,
> +  sub-sampled, and windowed 10-bit MIPI images in various formats via the
> +  Serial Camera Control Bus (SCCB) interface. This chip is programmable
> +  through I2C and two-wire SCCB. The sensor output is available via CSI-2
> +  serial data output (up to 4-lane).
> +
> +properties:
> +  compatible:
> +    const: ovti,ov8856
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    description:
> +      Input clock for the sensor.
> +    items:
> +      - const: xvclk
> +
> +  clock-frequency:
> +    description:
> +      Frequency of the xvclk clock in Hertz.
> +
> +  dovdd-supply:
> +    description:
> +      Definition of the regulator used as interface power supply.
> +
> +  avdd-supply:
> +    description:
> +      Definition of the regulator used as analog power supply.
> +
> +  dvdd-supply:
> +    description:
> +      Definition of the regulator used as digital power supply.
> +
> +  reset-gpios:
> +    description:
> +      The phandle and specifier for the GPIO that controls sensor reset.
> +      This corresponds to the hardware pin XSHUTDOWN which is physically
> +      active low.
> +
> +  port:
> +    type: object
> +    additionalProperties: false
> +    description:
> +      A node containing an output port node with an endpoint definition
> +      as documented in
> +      Documentation/devicetree/bindings/media/video-interfaces.txt
> +
> +    properties:
> +      endpoint:
> +        type: object
> +
> +        properties:
> +          data-lanes:
> +            description: |-
> +              The driver only supports four-lane operation.
> +            items:
> +              - const: 1
> +              - const: 2
> +              - const: 3
> +              - const: 4
> +
> +          link-frequencies:
> +            allOf:
> +              - $ref: /schemas/types.yaml#/definitions/uint64-array
> +            description:
> +              Allowed data bus frequencies. 360000000, 180000000 Hz or both
> +              are supported by the driver.
> +
> +
> +        required:
> +          - link-frequencies
> +
> +    required:
> +      - endpoint
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - clock-frequency
> +  - dovdd-supply
> +  - avdd-supply
> +  - dvdd-supply
> +  - reset-gpios
> +  - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        ov8856: camera@10 {
> +            compatible = "ovti,ov8856";
> +            reg = <0x10>;
> +
> +            reset-gpios = <&pio 111 GPIO_ACTIVE_LOW>;

Apologies for missing to follow the earlier discussion related to this.
I noticed the GPIO flag para and __ov8856_power_on() are aligned using
ACTIVE_LOW.

But from the datasheet, XSHUTDN pin is active-high for OV8856.
It means devm_gpiod_get API (in probe func) should use GPIOD_OUT_LOW to
initialize the GPIO as output with a value of 0.
Otherwise it should use GPIOD_OUT_HIGH.

There is one case for GPIO_ACTIVE_LOW setting:
https://patchwork.linuxtv.org/patch/63460/
https://patchwork.linuxtv.org/patch/63461/

Sakari, Tomasz, am I right?

> +            pinctrl-names = "default";
> +            pinctrl-0 = <&clk_24m_cam>;
> +
> +            clocks = <&cam_osc>;
> +            clock-names = "xvclk";
> +            clock-frequency = <19200000>;
> +
> +            avdd-supply = <&mt6358_vcama2_reg>;
> +            dvdd-supply = <&mt6358_vcamd_reg>;
> +            dovdd-supply = <&mt6358_vcamio_reg>;
> +
> +            port {
> +                wcam_out: endpoint {
> +                    remote-endpoint = <&mipi_in_wcam>;
> +                    data-lanes = <1 2 3 4>;
> +                    link-frequencies = /bits/ 64 <360000000>;
> +                };
> +            };
> +        };
> +    };
> +...
> \ No newline at end of file
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 26f281d9f32a..84b262afd13d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12489,6 +12489,7 @@ L:	linux-media@xxxxxxxxxxxxxxx
>  S:	Maintained
>  T:	git git://linuxtv.org/media_tree.git
>  F:	drivers/media/i2c/ov8856.c
> +F:	Documentation/devicetree/bindings/media/i2c/ov8856.yaml
>  

Had you run parse-maintainers.pl?
The new item is supposed to be arranged in alphabetical order.

>  OMNIVISION OV9640 SENSOR DRIVER
>  M:	Petr Cvek <petrcvekcz@xxxxxxxxx>





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