linux-kernel - Re: [PATCH v5 1/3] dt-bindings: input: microchip,cap11xx: add advanced sensitivity settings

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Date:   Fri, 10 Nov 2023 09:22:45 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jiri Valek - 2N <jiriv@...s.com>,
        krzysztof.kozlowski+dt@...aro.org, dmitry.torokhov@...il.com
Cc:     devicetree@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        u.kleine-koenig@...gutronix.de
Subject: Re: [PATCH v5 1/3] dt-bindings: input: microchip,cap11xx: add
 advanced sensitivity settings

On 08/11/2023 16:56, Jiri Valek - 2N wrote:
> Add support for advanced sensitivity settings and signal guard feature.
> 
> Signed-off-by: Jiri Valek - 2N <jiriv@...s.com>
> ---
>  .../bindings/input/microchip,cap11xx.yaml     | 76 ++++++++++++++++++-
>  1 file changed, 73 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml b/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml
> index 5b5d4f7d3482..aa97702c43ef 100644
> --- a/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml
> +++ b/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml
> @@ -45,13 +45,13 @@ properties:
>        Enables the Linux input system's autorepeat feature on the input device.
>  
>    linux,keycodes:
> -    minItems: 6
> -    maxItems: 6
> +    minItems: 3
> +    maxItems: 8
>      description: |
>        Specifies an array of numeric keycode values to
>        be used for the channels. If this property is
>        omitted, KEY_A, KEY_B, etc are used as defaults.
> -      The array must have exactly six entries.
> +      The number of entries must correspond to the number of channels.
>  
>    microchip,sensor-gain:
>      $ref: /schemas/types.yaml#/definitions/uint32
> @@ -70,6 +70,55 @@ properties:
>        open drain. This property allows using the active
>        high push-pull output.
>  
> +  microchip,sensitivity-delta-sense:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 32
> +    enum: [1, 2, 4, 8, 16, 32, 64, 128]
> +    description:
> +      Optional parameter. Controls the sensitivity multiplier of a touch detection.
> +      At the more sensitive settings, touches are detected for a smaller delta

Which values are more sensitive?

> +      capacitance corresponding to a “lighter” touch.

Looks like you use some non-ASCII characters for ".

> +
> +  microchip,signal-guard:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 3
> +    maxItems: 8
> +    items:
> +      minimum: 0
> +      maximum: 1
> +    description: |
> +      Optional parameter supported only for CAP129x.
> +      0 - off
> +      1 - on
> +      The signal guard isolates the signal from virtual grounds.
> +      If enabled then the behavior of the channel is changed to signal guard.
> +      The number of entries must correspond to the number of channels.
> +
> +  microchip,input-treshold:

typo: threshold

> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 3
> +    maxItems: 8
> +    items:
> +      minimum: 0
> +      maximum: 127
> +    description:
> +      Optional parameter. Specifies the delta threshold that is used to

Drop everywhere the "optional parameter". It's redundant. required:
block tells what is / is not optional.

> +      determine if a touch has been detected.

In what units are the values?

> +      The number of entries must correspond to the number of channels.
> +
> +  microchip,calib-sensitivity:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 3
> +    maxItems: 8
> +    items:
> +      minimum: 1
> +      maximum: 4
> +    description:
> +      Optional parameter supported only for CAP129x. Specifies an array of
> +      numeric values that controls the gain used by the calibration routine to
> +      enable sensor inputs to be more sensitive for proximity detection.

Gain is usually in dB, isn't it?

> +      The number of entries must correspond to the number of channels.
> +
>  patternProperties:
>    "^led@[0-7]$":


Best regards,
Krzysztof