linux-kernel - Re: [PATCH v2 04/10] gpio: aggregator: add read-write 'name' attribute

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Message-ID: <u5ymxczuu6xa2zhuoebasysham34fqokg52rmspropouxgkgaz@w52wq77dpxvw>
Date: Thu, 13 Feb 2025 23:13:18 +0900
From: Koichiro Den <koichiro.den@...onical.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: linux-gpio@...r.kernel.org, brgl@...ev.pl, linus.walleij@...aro.org, 
	maciej.borzecki@...onical.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/10] gpio: aggregator: add read-write 'name'
 attribute

On Wed, Feb 12, 2025 at 03:27:50PM GMT, Geert Uytterhoeven wrote:
> Hi Den,
> 
> On Mon, 3 Feb 2025 at 04:12, Koichiro Den <koichiro.den@...onical.com> wrote:
> > Previously, there is no way to assign names to GPIO lines exported
> > through an aggregator.
> >
> > Allow users to set custom line names via a 'name' attribute.
> >
> > Signed-off-by: Koichiro Den <koichiro.den@...onical.com>
> 
> Thanks for your patch!
> 
> > --- a/drivers/gpio/gpio-aggregator.c
> > +++ b/drivers/gpio/gpio-aggregator.c
> > @@ -63,6 +63,8 @@ struct gpio_aggregator_line {
> >         /* Line index within the aggregator device */
> >         int idx;
> >
> > +       /* Custom name for the virtual line */
> > +       char *name;
> 
> This can be const.

Will fix in v3.

> 
> >         /* GPIO chip label or line name */
> >         char *key;
> 
> Actually this can be const, too.

Will fix in v3.

> 
> >         /* Can be negative to indicate lookup by line name */
> > @@ -678,6 +680,44 @@ gpio_aggr_line_key_store(struct config_item *item, const char *page,
> >
> >  CONFIGFS_ATTR(gpio_aggr_line_, key);
> >
> > +static ssize_t
> > +gpio_aggr_line_name_show(struct config_item *item, char *page)
> > +{
> > +       struct gpio_aggregator_line *line = to_gpio_aggregator_line(item);
> > +       struct gpio_aggregator *aggr = line->parent;
> > +
> > +       guard(mutex)(&aggr->lock);
> > +
> > +       return sprintf(page, "%s\n", line->name ?: "");
> 
> sysfs_emit()

Will fix in v3.

Thanks!

Koichiro

> 
> > +}
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds