linux-kernel - Re: [PATCH 2/3] Input: rotary-encoder-counter: add DT bindings

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Date:   Thu, 9 Apr 2020 15:21:15 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Kamel Bouhara <kamel.bouhara@...tlin.com>
Cc:     William Breathitt Gray <vilhelm.gray@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH 2/3] Input: rotary-encoder-counter: add DT bindings

On Mon, Apr 06, 2020 at 05:58:05PM +0200, Kamel Bouhara wrote:
> Add dt binding for the counter variant of the rotary encoder driver.
> 
> Signed-off-by: Kamel Bouhara <kamel.bouhara@...tlin.com>
> ---
>  .../input/rotary-encoder-counter.yaml         | 67 +++++++++++++++++++
>  1 file changed, 67 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/rotary-encoder-counter.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/rotary-encoder-counter.yaml b/Documentation/devicetree/bindings/input/rotary-encoder-counter.yaml
> new file mode 100644
> index 000000000000..a59f7c1faf0c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/rotary-encoder-counter.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/rotary-encoder-counter.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rotary Encoder Counter
> +
> +maintainers:
> +  - Kamel Bouhara <kamel.bouhara@...tlin.com>
> +
> +description:
> +  Registers a Rotary encoder connected through a counter device.
> +
> +properties:
> +  compatible:
> +    const: rotary-encoder-counter

I wonder if a separate driver is really needed. The original driver be
taught to use counter device when available?

> +
> +  counter:
> +    description: Phandle for the counter device providing rotary position.
> +
> +  linux-axis:
> +    description: The input subsystem axis to map to this rotary encoder.
> +    type: boolean
> +
> +  qdec-mode:
> +    description: |
> +      Quadrature decoder function to set in the counter device.
> +      3: x1-PHA
> +      4: x1-PHB
> +      5: x2-PHA
> +      6: x2-PHB
> +      7: x4-PHA and PHB

Is it really property of the rotary encoder itself or property of the
counter device?

> +
> +  steps:
> +    description: Number of steps in a full turnaround of the encoder.
> +      Only relevant for absolute axis. Defaults to 24 which is a typical
> +      value for such devices.
> +
> +  relative-axis:
> +    description: Register a relative axis rather than an absolute one.
> +    type: boolean
> +
> +  rollover:
> +    description: Automatic rollover when the rotary value becomes greater
> +      than the specified steps or smaller than 0. For absolute axis only.
> +    type: boolean
> +
> +  poll-interval:
> +    description: Poll interval at which the position is read from the counter
> +      device (default 500ms).

Is there a way found counters to signal an interrupt?

Thanks.

-- 
Dmitry