linux-kernel - Re: [PATCH v8 2/2] dt-bindings: input: Goodix SPI HID Touchscreen

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Message-ID: <8d5ff5c7-1f66-4a1b-a235-868d13afe03e@kernel.org>
Date: Mon, 30 Sep 2024 08:42:22 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Charles Wang <charles.goodix@...il.com>
Cc: jikos@...nel.org, bentiss@...nel.org, hbarnor@...omium.org,
 linux-input@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v8 2/2] dt-bindings: input: Goodix SPI HID Touchscreen

On 30/09/2024 05:22, Charles Wang wrote:
> Hi Krzysztof,
> Thank you very much for your advice.
> 
> On Thu, Sep 26, 2024 at 02:32:05PM +0200, Krzysztof Kozlowski wrote:
>> On 26/09/2024 11:57, Charles Wang wrote:
>>>>>  1 file changed, 71 insertions(+)
>>>>>  create mode 100644 Documentation/devicetree/bindings/input/goodix,gt7986u.yaml
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml b/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml
>>>>> new file mode 100644
>>>>> index 000000000..849117639
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/input/goodix,gt7986u.yaml
>>>>> @@ -0,0 +1,71 @@
>>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>>> +%YAML 1.2
>>>>> +---
>>>>> +$id: http://devicetree.org/schemas/input/goodix,gt7986u.yaml#
>>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>>> +
>>>>> +title: GOODIX GT7986U SPI HID Touchscreen
>>>>> +
>>>>> +maintainers:
>>>>> +  - Charles Wang <charles.goodix@...il.com>
>>>>> +
>>>>> +description: Supports the Goodix GT7986U touchscreen.
>>>>> +  This touch controller reports data packaged according to the HID protocol,
>>>>> +  but is incompatible with Microsoft's HID-over-SPI protocol.
>>>>> +
>>>>> +allOf:
>>>>> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
>>>>> +
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    enum:
>>>>> +      - goodix,gt7986u-spi
>>>>
>>>> NAK, you duplicate again the binding. You cannot have bus-flavors.
>>>> Device is the same.
>>>>
>>>
>>> Could you provide some suggestions regarding this issue?
>>
>> What is exactly the question or problem? There is a binding for this
>> device. Extend it with SPI parts, e.g.
>> https://elixir.bootlin.com/linux/v6.4-rc7/source/Documentation/devicetree/bindings/iio/accel/adi,adxl313.yaml#L22
>>
> 
> This seems a little different from the adxl313.yaml.

Hm? I am reading below:

> 
> The issue we're encountering involves the chip model gt7986u,
> which supports both I2C and SPI interfaces. For the I2C interface
> (using the HID-over-I2C driver), it has already been declared in
> the goodix,gt7375p.yaml file as follows:
> 
> i2c {
>   #address-cells = <1>;
>   #size-cells = <0>;
> 
>   ap_ts: touchscreen@5d {
>     compatible = "goodix,gt7986u";
>   }
> }
> 
> Currently, our design requires utilizing the SPI interface with
> a custom SPI driver. However, the declarations within the binding
> file have led to conflicts, as shown here:
> 
> spi {
>   #address-cells = <1>;
>   #size-cells = <0>;
> 
>   touchscreen@0 {
>     compatible = "goodix,gt7986u";
>   }
> }
> 
> Should I consider merging both YAML files into a single one to fix this?

And there is no difference. I don't understand the problem.

Best regards,
Krzysztof