linux-kernel - Re: [PATCH v2 2/3] gpio: sim: convert to use dev-sync-probe utilities

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Message-ID: <w6qjqr2uccbli4nejka2z7dusjcyrdqklda6au7qqkesubmfgb@hspgx2zmru3p>
Date: Thu, 20 Feb 2025 22:09:55 +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 v2 2/3] gpio: sim: convert to use dev-sync-probe utilities

On Thu, Feb 20, 2025 at 12:08:18PM GMT, Bartosz Golaszewski wrote:
> On Tue, Feb 18, 2025 at 5:04 PM Koichiro Den <koichiro.den@...onical.com> wrote:
> >
> > Update gpio-sim to use the new dev-sync-probe helper functions for
> > synchronized platform device creation, reducing code duplication.
> >
> > No functional change.
> >
> > Signed-off-by: Koichiro Den <koichiro.den@...onical.com>
> > ---
> >  drivers/gpio/Kconfig    |  2 +
> >  drivers/gpio/gpio-sim.c | 84 ++++++-----------------------------------
> >  2 files changed, 14 insertions(+), 72 deletions(-)
> >
> > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> > index 2e4c5f0a94f7..ba06f052b9ea 100644
> > --- a/drivers/gpio/Kconfig
> > +++ b/drivers/gpio/Kconfig
> > @@ -1866,6 +1866,7 @@ endmenu
> >  # This symbol is selected by drivers that need synchronous fake device creation
> >  config DEV_SYNC_PROBE
> >         tristate "Utilities for synchronous fake device creation"
> > +       depends on GPIO_SIM
> 
> No, it does not. Please drop this.

I'll hide the config as you pointed out, and drop this while at it. Thanks.

> 
> >         help
> >           Common helper functions for drivers that need synchronous fake
> >           device creation.
> > @@ -1916,6 +1917,7 @@ config GPIO_SIM
> >         tristate "GPIO Simulator Module"
> >         select IRQ_SIM
> >         select CONFIGFS_FS
> > +       select DEV_SYNC_PROBE
> >         help
> >           This enables the GPIO simulator - a configfs-based GPIO testing
> >           driver.
> > diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c
> > index a086087ada17..d1cdea450937 100644
> > --- a/drivers/gpio/gpio-sim.c
> > +++ b/drivers/gpio/gpio-sim.c
> > @@ -10,7 +10,6 @@
> >  #include <linux/array_size.h>
> >  #include <linux/bitmap.h>
> >  #include <linux/cleanup.h>
> > -#include <linux/completion.h>
> >  #include <linux/configfs.h>
> >  #include <linux/device.h>
> >  #include <linux/err.h>
> > @@ -37,6 +36,8 @@
> >  #include <linux/sysfs.h>
> >  #include <linux/types.h>
> >
> > +#include "dev-sync-probe.h"
> > +
> >  #define GPIO_SIM_NGPIO_MAX     1024
> >  #define GPIO_SIM_PROP_MAX      4 /* Max 3 properties + sentinel. */
> >  #define GPIO_SIM_NUM_ATTRS     3 /* value, pull and sentinel */
> > @@ -541,14 +542,9 @@ static struct platform_driver gpio_sim_driver = {
> >  };
> >
> >  struct gpio_sim_device {
> > +       struct dev_sync_probe_data data;
> 
> Maybe something more indicative of the purpose? probe_data? sync_probe_data?

Hm, right. I'll go with probe_data. Thanks!

> 
> Bart