[v4,0/2] media: i2c: Add support for GC08A3 sensor

This series adds YAML DT binding and V4L2 sub-device driver for Galaxycore's
GC08A3 8-megapixel 10-bit RAW CMOS 1/4" sensor, with an MIPI CSI-2 image data
interface and the I2C control bus.

The driver is implemented with V4L2 framework.
 - Async registered as a V4L2 sub-device.
 - As the first component of camera system including Seninf, ISP pipeline.
 - A media entity that provides one source pad in common.
 - Used in camera features on ChromeOS application.

Also this driver supports following features:
 - manual exposure and analog gain control support
 - vertical blanking control support
 - test pattern support
 - media controller support
 - runtime PM support
 - support resolution: 3264x2448@30fps, 1920x1080@60fps

Previous versions of this patch-set can be found here:
v3: https://lore.kernel.org/linux-media/20240109022715.30278-1-zhi.mao@mediatek.com/
v2: https://lore.kernel.org/linux-media/20231207052016.25954-1-zhi.mao@mediatek.com/
v1: https://lore.kernel.org/linux-media/20231123115104.32094-1-zhi.mao@mediatek.com/

This series is based on linux-next, tag: next-20240202
Changes in v4:
- dts-binding files：
-- rename the titile of patch "dt-bindings"
-- use "sensor@31" as device node,according to Krzysztof's suggestion

- gc08a sensor driver：
-- use "ARRAY_SIZE(...)" directly in driver code, instead of macros
-- use pointer to corresponds an array entry of link_frequency
-- use variable of struc "mode" in function:gc08a3_get_selection()
-- declare ret as last in function:gc08a3_test_pattern()
-- fix some coding style by "checkpatch.pl --strict --max-line-length=80"
-- remove function:gc08a3_g_mbus_config()
-- use "v4l2_link_freq_to_bitmap()" API to parse driver-supported link frequencies
-- move runtime PM API before registering the sub-device in function:probe()

Thanks

Zhi Mao (2):
  media: dt-bindings: i2c: add GalaxyCore GC08A3 image sensor
  media: i2c: Add GC08A3 image sensor driver

 .../bindings/media/i2c/galaxycore,gc08a3.yaml |  112 ++
 drivers/media/i2c/Kconfig                     |   10 +
 drivers/media/i2c/Makefile                    |    1 +
 drivers/media/i2c/gc08a3.c                    | 1448 +++++++++++++++++
 4 files changed, 1571 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/galaxycore,gc08a3.yaml
 create mode 100644 drivers/media/i2c/gc08a3.c

Hi Zhi,

Thank you for the patch.

On Sun, Feb 04, 2024 at 02:15:37PM +0800, Zhi Mao wrote:
> Add YAML device tree binding for GC08A3 CMOS image sensor,
> and the relevant MAINTAINERS entries.
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Signed-off-by: Zhi Mao <zhi.mao@mediatek.com>

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

> ---
>  .../bindings/media/i2c/galaxycore,gc08a3.yaml | 112 ++++++++++++++++++
>  1 file changed, 112 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/i2c/galaxycore,gc08a3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/galaxycore,gc08a3.yaml b/Documentation/devicetree/bindings/media/i2c/galaxycore,gc08a3.yaml
> new file mode 100644
> index 000000000000..8c09e8c121e5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/i2c/galaxycore,gc08a3.yaml
> @@ -0,0 +1,112 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (c) 2023 MediaTek Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/i2c/galaxycore,gc08a3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: GalaxyCore gc08a3 1/4" 8M Pixel MIPI CSI-2 sensor
> +
> +maintainers:
> +  - Zhi Mao <zhi.mao@mediatek.com>
> +
> +description:
> +  The gc08a3 is a raw image sensor with an MIPI CSI-2 image data
> +  interface and CCI (I2C compatible) control bus. The output format
> +  is raw Bayer.
> +
> +properties:
> +  compatible:
> +    const: galaxycore,gc08a3
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  dovdd-supply: true
> +
> +  avdd-supply: true
> +
> +  dvdd-supply: true
> +
> +  reset-gpios:
> +    description: Reference to the GPIO connected to the RESETB pin.
> +    maxItems: 1
> +
> +  port:
> +    $ref: /schemas/graph.yaml#/$defs/port-base
> +    additionalProperties: false
> +    description:
> +      Output port node, single endpoint describing the CSI-2 transmitter.
> +
> +    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
> +
> +          link-frequencies: true
> +
> +        required:
> +          - data-lanes
> +          - link-frequencies
> +
> +    required:
> +      - endpoint
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - 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>;
> +
> +        sensor@31 {
> +            compatible = "galaxycore,gc08a3";
> +            reg = <0x31>;
> +
> +            clocks = <&gc08a3_clk>;
> +
> +            reset-gpios = <&pio 19 GPIO_ACTIVE_HIGH>;
> +
> +            avdd-supply = <&gc08a3_avdd>;
> +            dovdd-supply = <&gc08a3_dovdd>;
> +            dvdd-supply = <&gc08a3_dvdd>;
> +
> +            port {
> +                sensor_out: endpoint {
> +                    data-lanes = <1 2 3 4>;
> +                    link-frequencies = /bits/ 64 <336000000 207000000>;
> +                    remote-endpoint = <&seninf_csi_port_0_in>;
> +                };
> +            };
> +        };
> +    };
> +
> +...