linux-kernel - Re: [PATCH v3 1/5] gpiolib: cdev: relocate debounce_period_us from struct gpio

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Date: Fri, 15 Dec 2023 18:35:14 +0200
From: Andy Shevchenko <andy@...nel.org>
To: Kent Gibson <warthog618@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org, brgl@...ev.pl,
	linus.walleij@...aro.org
Subject: Re: [PATCH v3 1/5] gpiolib: cdev: relocate debounce_period_us from
 struct gpio_desc

On Fri, Dec 15, 2023 at 10:38:01AM +0800, Kent Gibson wrote:
> Store the debounce period for a requested line locally, rather than in
> the debounce_period_us field in the gpiolib struct gpio_desc.
> 
> Add a global tree of lines containing supplemental line information
> to make the debounce period available to be reported by the
> GPIO_V2_GET_LINEINFO_IOCTL and the line change notifier.

LGTM, a few minor comments below.

...

> +/*

(now you can have a kernel doc :-)

> + * a rbtree of the struct lines containing supplemental info.
> + * Used to populate gpio_v2_line_info with cdev specific fields not contained
> + * in the struct gpio_desc.
> + * A line is determined to contain supplemental information by
> + * line_is_supplemental().
> + */
> +static struct rb_root supinfo_tree = RB_ROOT;
> +/* covers supinfo_tree */
> +DEFINE_SPINLOCK(supinfo_lock);

Shouldn't this also be static?

...

> +	guard(spinlock)(&supinfo_lock);

+ cleanup.h ?

...

> +static void supinfo_to_lineinfo(struct gpio_desc *desc,
> +				struct gpio_v2_line_info *info)
> +{
> +	struct gpio_v2_line_attribute *attr;
> +	struct line *line;
> +
> +	guard(spinlock)(&supinfo_lock);
> +
> +	line = supinfo_find(desc);
> +	if (line) {

	if (!line)
		return;

?

> +		attr = &info->attrs[info->num_attrs];
> +		attr->id = GPIO_V2_LINE_ATTR_ID_DEBOUNCE;
> +		attr->debounce_period_us = READ_ONCE(line->debounce_period_us);
> +		info->num_attrs++;
> +	}
> +}

-- 
With Best Regards,
Andy Shevchenko