linux-kernel - Re: [PATCH v6 4/9] gpio: aggregator: introduce basic configfs interface

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Message-ID: <oneoncbyv3iwb54kvjvmerv4xxhixgeqp44ubeikvy4yst3az3@g5c7uxgkonbx>
Date: Fri, 21 Mar 2025 21:33:16 +0900
From: Koichiro Den <koichiro.den@...onical.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-gpio@...r.kernel.org, geert+renesas@...der.be, 
	linus.walleij@...aro.org, maciej.borzecki@...onical.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/9] gpio: aggregator: introduce basic configfs
 interface

On Fri, Mar 21, 2025 at 12:18:02PM GMT, Bartosz Golaszewski wrote:
> On Fri, Mar 21, 2025 at 3:35 AM Koichiro Den <koichiro.den@...onical.com> wrote:
> >
> > On Thu, Mar 20, 2025 at 04:54:26PM GMT, Bartosz Golaszewski wrote:
> > > On Sat, Mar 15, 2025 at 5:41 PM Koichiro Den <koichiro.den@...onical.com> wrote:
> > > >
> > > > ---(snip)---
> > > >
> > > > Signed-off-by: Koichiro Den <koichiro.den@...onical.com>
> > > > ---
> > > >
> > > > @@ -90,6 +124,70 @@ static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *key,
> > > >         return 0;
> > > >  }
> > > >
> > > > +static bool aggr_is_active(struct gpio_aggregator *aggr)
> > >
> > > Series-wide: I would prefer a different prefix: why not
> > > gpio_aggregator or at least gpio_aggr?
> >
> > Actually, that naming was intentional, but perhaps I could say this is just my
> > personal preference. Here is a breakdown of the function name prefixes:
> >
> >   Before this patch series:
> >   * forwarder:        gpiochip_fwd_* + gpio_fwd_*
> >   * sysfs interface:  new_device/delete_device + aggr_*
> >   * platform device:  gpio_aggregator_*
> >   * module init/exit: gpio_aggregator_*
> 
> Yeah, it could use some more consistency. First: there's ongoing
> work[1] on moving the forwarder code into its own library which is a
> chance to change its prefix to gpio_forwarder_. You could add a patch
> renaming the sysfs interfaces while sending v7.
> 
> >
> >   After this patch series:
> >   * common utils:     aggr_*
> 
> I'd prefer to keep gpio_aggregator_ here...
> 
> >   * forwarder:        gpiochip_fwd_* + gpio_fwd_*  <-- _Unchanged_
> >   * configfs:         gpio_aggr_*
> 
> and here.
> 
> >   * sysfs interface:  new_device/delete_device     <-- _Unchanged_
> >   * platform device:  gpio_aggregator_*            <-- _Unchanged_
> >   * module init/exit: gpio_aggregator_*            <-- _Unchanged_
> >

Actually I wasn't aware of [1]. So let me summarize: does this match what
you have in mind?

  Before this patch series:
  * forwarder:        gpiochip_fwd_* + gpio_fwd_*
  * sysfs interface:  new_device/delete_device + aggr_*
  * platform device:  gpio_aggregator_*
  * module init/exit: gpio_aggregator_*

  After this patch series:
  * common utils:     gpio_aggregator_*
  * forwarder:        gpio_forwarder_*
  * configfs:         gpio_aggregator_*
  * sysfs interface:  new_device/delete_device     <-- _Unchanged_
  * platform device:  gpio_aggregator_*            <-- _Unchanged_
  * module init/exit: gpio_aggregator_*            <-- _Unchanged_

Thanks,

Koichiro

> 
> Bartosz
> 
> [1] https://lore.kernel.org/all/20250317-aaeon-up-board-pinctrl-support-v2-0-36126e30aa62@bootlin.com/