linux-kernel - Re: [PATCH v4 1/2] dt-bindings: input: microchip,cap11xx: add advanced sensitivity settings

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Message-ID: <20230629151635.GA3003066-robh@kernel.org>
Date:   Thu, 29 Jun 2023 09:16:35 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jiri Valek - 2N <jiriv@...s.com>
Cc:     krzysztof.kozlowski+dt@...aro.org, dmitry.torokhov@...il.com,
        devicetree@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, u.kleine-koenig@...gutronix.de
Subject: Re: [PATCH v4 1/2] dt-bindings: input: microchip,cap11xx: add
 advanced sensitivity settings

On Tue, Jun 27, 2023 at 08:53:15AM +0200, 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     | 77 +++++++++++++++++--
>  1 file changed, 72 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml b/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml
> index 5fa625b5c5fb..b69dac1fba0e 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.

This change seems unrelated? Or maybe advanced sensitivity means more 
channels? If so, explain this in the commit msg.

>  
>    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
> +      capacitance corresponding to a “lighter” touch.
> +
> +  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:
> +    $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
> +      determine if a touch has been detected.
> +      The number of entries must correspond to the number of channels.
> +
> +  microchip,calib-sensitivity:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 3
> +    maxItems: 8
> +    items:
> +      minimum: 1
> +      maximum: 4
> +    description:
> +      Optional parameter supported only for CAP129x. Specifies an array of
> +      numeric values that controls the gain used by the calibration routine to
> +      enable sensor inputs to be more sensitive for proximity detection.
> +      The number of entries must correspond to the number of channels.
> +
>  patternProperties:
>    "^led@[0-7]$":
>      type: object
> @@ -98,10 +147,23 @@ allOf:
>          compatible:
>            contains:
>              enum:
> -              - microchip,cap1106
> +              - microchip,cap1188
>      then:
>        patternProperties:
> -        "^led@[0-7]$": false
> +        "^led@[0-7]$": true
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - microchip,cap1293
> +              - microchip,cap1298
> +
> +    then:
> +      properties:
> +        microchip,signal-guard: true
> +        microchip,calib-sensitivity: true

This 'if' doesn't do anything. These properties are already allowed. You 
need an if for the cases they aren't allowed.

>  
>  required:
>    - compatible
> @@ -122,6 +184,11 @@ examples:
>          reg = <0x28>;
>          autorepeat;
>          microchip,sensor-gain = <2>;
> +        microchip,sensitivity-delta-sense = <16>;
> +
> +        microchip,signal-guard = <0>, <0>, <0>, <0>, <0>, <0>;
> +        microchip,input-treshold = <21>, <18>, <46>, <46>, <46>, <21>;
> +        microchip,calib-sensitivity = <1>, <2>, <2>, <1>, <1>, <2>;
>  
>          linux,keycodes = <103>,	/* KEY_UP */
>                           <106>,	/* KEY_RIGHT */
> -- 
> 2.25.1
>