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Date:   Sun, 17 Jan 2021 23:22:07 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>
To:     Sakari Ailus <sakari.ailus@....fi>
Cc:     mchehab@...nel.org, robh+dt@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        phone-devel@...r.kernel.org, konrad.dybcio@...ainline.org,
        marijn.suijten@...ainline.org, martin.botka@...ainline.org
Subject: Re: [PATCH v4 2/2] media: dt-bindings: media: i2c: Add IMX300 CMOS
 sensor binding

Il 17/01/21 00:44, Sakari Ailus ha scritto:
> Hi AngeloGioacchino,
> 
> On Wed, Jan 13, 2021 at 07:29:34PM +0100, AngeloGioacchino Del Regno wrote:
>> Add YAML device tree binding for IMX300 CMOS image sensor, and
>> the relevant MAINTAINERS entries.
>>
>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
>> ---
>>   .../bindings/media/i2c/sony,imx300.yaml       | 112 ++++++++++++++++++
>>   MAINTAINERS                                   |   7 ++
>>   2 files changed, 119 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/media/i2c/sony,imx300.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/media/i2c/sony,imx300.yaml b/Documentation/devicetree/bindings/media/i2c/sony,imx300.yaml
>> new file mode 100644
>> index 000000000000..4fa767feea80
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/i2c/sony,imx300.yaml
>> @@ -0,0 +1,112 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/media/i2c/sony,imx300.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Sony 1/2.3-Inch 25Mpixel Stacked CMOS Digital Image Sensor
>> +
>> +maintainers:
>> +  - AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
>> +
>> +description: |-
>> +  The Sony IMX300 is a 1/2.3-inch Stacked CMOS (Exmor-RS) digital image
>> +  sensor with a pixel size of 1.08um and an active array size of
>> +  5948H x 4140V. It is programmable through I2C interface at address 0x10.
>> +  Image data is sent through MIPI CSI-2, which is configured as either 2 or
>> +  4 data lanes.
>> +
>> +properties:
>> +  compatible:
>> +    const: sony,imx300
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
> 
> Please add assigned clock related properties; see
> Documentation/driver-api/media/camera-sensor.rst .
> 
>> +
>> +  vdig-supply:
>> +    description:
>> +      Digital I/O voltage supply, 1.15-1.20 volts
>> +
>> +  vana-supply:
>> +    description:
>> +      Analog voltage supply, 2.2 volts
>> +
>> +  vddl-supply:
>> +    description:
>> +      Digital core voltage supply, 1.8 volts
>> +
>> +  reset-gpios:
>> +    description: |-
>> +      Reference to the GPIO connected to the xclr pin, if any.
>> +      Must be released (set high) after all supplies are applied.
>> +
>> +  # See ../video-interfaces.txt for more details
>> +  port:
>> +    type: object
>> +    properties:
>> +      endpoint:
>> +        type: object
>> +
>> +        properties:
>> +          data-lanes:
>> +            description: |-
>> +              The driver only supports four-lane operation.
> 
> This can be removed as bindings describe hardware, not driver operation.
> 
>> +            items:
>> +              - const: 0
>> +              - const: 1
>> +              - const: 2
>> +              - const: 3
> 
> Two lanes here, too?
> 
>> +
>> +          clock-noncontinuous: true
>> +
>> +          link-frequencies:
>> +            $ref: /schemas/types.yaml#/definitions/uint64-array
>> +            description:
>> +              Allowed data bus frequencies. The driver currently needs
>> +              to switch between 780000000 and 480000000 Hz in order to
>> +              guarantee functionality of all modes.
> 
> You can omit this description, too.
> 
>> +
>> +        required:
>> +          - data-lanes
>> +          - link-frequencies
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - vana-supply
>> +  - vdig-supply
>> +  - vddl-supply
> 
> Are the regulators really required? I'm not quite sure about the
> established practices; still the common case is that one or two of these
> are hard-wired.
> 
>> +  - port
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    i2c0 {
>> +        #address-cells = <1>;
>> +        #size-cells = <0>;
>> +
>> +        imx300: sensor@10 {
>> +            compatible = "sony,imx300";
>> +            reg = <0x10>;
>> +            clocks = <&imx300_xclk>;
>> +            vana-supply = <&imx300_vana>;   /* 2.2v */
>> +            vdig-supply = <&imx300_vdig>;   /* 1.2v */
>> +            vddl-supply = <&imx300_vddl>;   /* 1.8v */
>> +
>> +            port {
>> +                imx300_0: endpoint {
>> +                    remote-endpoint = <&csi1_ep>;
>> +                    data-lanes = <0 1 2 3>;
>> +                    clock-noncontinuous;
>> +                    link-frequencies = /bits/ 64 <780000000 480000000>;
>> +                };
>> +            };
>> +        };
>> +    };
>> +
>> +...
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index ad9abb42f852..5e0f08f48d48 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -16633,6 +16633,13 @@ T:	git git://linuxtv.org/media_tree.git
>>   F:	Documentation/devicetree/bindings/media/i2c/imx290.txt
>>   F:	drivers/media/i2c/imx290.c
>>   
>> +SONY IMX300 SENSOR DRIVER
>> +M:	AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
>> +L:	linux-media@...r.kernel.org
> 
> Please also add the git tree.
> 
> Ideally also the MAINTAINERS change comes with the first patch adding the
> files, which should be the DT bindings. I.e. just reverse the order of the
> patches.
> 
>> +S:	Maintained
>> +F:	Documentation/devicetree/bindings/media/i2c/sony,imx300.yaml
>> +F:	drivers/media/i2c/imx300.c
>> +
>>   SONY IMX319 SENSOR DRIVER
>>   M:	Bingbu Cao <bingbu.cao@...el.com>
>>   L:	linux-media@...r.kernel.org
> 

Besides that, I'm sorry I forgot to port the following tag from V3 of 
this patch, which didn't change.

I'm adding the forgotten R-b from Rob here:

Reviewed-by: Rob Herring <robh@...nel.org>

Sorry again.

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