linux-kernel - Re: [PATCH 2/8] counter/ti-eqep: add support for direction

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Date:   Sun, 17 Oct 2021 12:11:28 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     David Lechner <david@...hnology.com>
Cc:     linux-iio@...r.kernel.org,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Robert Nelson <robertcnelson@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] counter/ti-eqep: add support for direction

On Sat, 16 Oct 2021 20:33:37 -0500
David Lechner <david@...hnology.com> wrote:

> This adds support for direction to the TI eQEP counter driver. It adds
> both a direction attribute to sysfs and a direction change event to
> the chrdev. The direction change event type is new public API.
> 
> Signed-off-by: David Lechner <david@...hnology.com>

Trivial comment inline.

> ---
>  drivers/counter/ti-eqep.c    | 33 +++++++++++++++++++++++++++++++++
>  include/uapi/linux/counter.h |  2 ++
>  2 files changed, 35 insertions(+)
> 

...

>  static struct counter_signal ti_eqep_signals[] = {
> @@ -442,6 +471,10 @@ static irqreturn_t ti_eqep_irq_handler(int irq, void *dev_id)
>  	if (qflg & QFLG_PCU)
>  		counter_push_event(counter, COUNTER_EVENT_UNDERFLOW, 0);
>  
> +	if (qflg & QFLG_QDC)
> +		counter_push_event(counter, COUNTER_EVENT_DIRECTION_CHANGE, 0);
> +

Nitpick. One blank line is enough here.

> +
>  	regmap_set_bits(priv->regmap16, QCLR, ~0);
>  
>  	return IRQ_HANDLED;
> diff --git a/include/uapi/linux/counter.h b/include/uapi/linux/counter.h
> index d0aa95aeff7b..36dd3b474d09 100644
> --- a/include/uapi/linux/counter.h
> +++ b/include/uapi/linux/counter.h
> @@ -61,6 +61,8 @@ enum counter_event_type {
>  	COUNTER_EVENT_THRESHOLD,
>  	/* Index signal detected */
>  	COUNTER_EVENT_INDEX,
> +	/* Direction change detected */
> +	COUNTER_EVENT_DIRECTION_CHANGE,
>  };
>  
>  /**