linux-kernel - Re: [PATCH v2 1/3] misc: servo-pwm: driver for controlling servo motors via PWM

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Date:   Fri, 17 Feb 2023 16:36:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Angelo Compagnucci <angelo.compagnucci@...il.com>
Cc:     Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        Angelo Compagnucci <angelo@...rulasolutions.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-kernel@...r.kernel.org,
        linux-pwm@...r.kernel.org
Subject: Re: [PATCH v2 1/3] misc: servo-pwm: driver for controlling servo
 motors via PWM

On Fri, Feb 17, 2023 at 03:57:28PM +0100, Angelo Compagnucci wrote:
> This patch adds a simple driver to control servo motor position via
> PWM signal.
> The driver allows to set the angle from userspace, while min/max
> positions duty cycle and the motor degrees aperture are defined in
> the dts.
> 
> Signed-off-by: Angelo Compagnucci <angelo@...rulasolutions.com>
> ---
>  MAINTAINERS              |   6 ++
>  drivers/misc/Kconfig     |  11 +++
>  drivers/misc/Makefile    |   1 +
>  drivers/misc/servo-pwm.c | 149 +++++++++++++++++++++++++++++++++++++++

You add sysfs files but do not document them in Documentation/ABI/ which
is required.  Please do so in your next version of this patch.

> +static ssize_t degrees_show(struct device *dev, struct device_attribute *attr,
> +			  char *buf)
> +{
> +	struct servo_pwm_data *data = dev_get_drvdata(dev);
> +
> +	return snprintf(buf, PAGE_SIZE, "%u\n", data->degrees);

sysfs_emit() please.

thanks,

greg k-h