linux-kernel - Re: [PATCH v5 1/5] gpio: of: support to add custom add pin range function

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Message-ID: <20250222132301-GYA37325@gentoo>
Date: Sat, 22 Feb 2025 13:23:01 +0000
From: Yixun Lan <dlan@...too.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Conor Dooley <conor@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>, Yangyu Chen <cyy@...self.name>,
	Jisheng Zhang <jszhang@...nel.org>,
	Jesse Taube <mr.bossman075@...il.com>,
	Inochi Amaoto <inochiama@...look.com>,
	Icenowy Zheng <uwu@...nowy.me>,
	Meng Zhang <zhangmeng.kevin@...ux.spacemit.com>,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
	spacemit@...ts.linux.dev
Subject: Re: [PATCH v5 1/5] gpio: of: support to add custom add pin range
 function

Hi Bartosz Golaszewski:

On 11:22 Thu 20 Feb     , Bartosz Golaszewski wrote:
> On Mon, Feb 17, 2025 at 1:58 PM Yixun Lan <dlan@...too.org> wrote:
> >
> > Export custom function to add gpio pin range from pinctrl
> > subsystem. This would make it possible to add pins to multi
> > gpio chips.
> >
> > Signed-off-by: Yixun Lan <dlan@...too.org>
> > ---
> >  drivers/gpio/gpiolib-of.c   | 5 ++++-
> >  include/linux/gpio/driver.h | 7 +++++++
> >  2 files changed, 11 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
> > index 2e537ee979f3e2b6e8d5f86f3e121a66f2a8e083..64c8a153b823d65faebed9c4cd87952359b42765 100644
> > --- a/drivers/gpio/gpiolib-of.c
> > +++ b/drivers/gpio/gpiolib-of.c
> > @@ -1170,7 +1170,10 @@ int of_gpiochip_add(struct gpio_chip *chip)
> >         if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS)
> >                 return -EINVAL;
> >
> > -       ret = of_gpiochip_add_pin_range(chip);
> > +       if (!chip->of_add_pin_range)
> > +               chip->of_add_pin_range = of_gpiochip_add_pin_range;
> > +
> > +       ret = chip->of_add_pin_range(chip);
> >         if (ret)
> >                 return ret;
> >
> > diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
> > index 2dd7cb9cc270a68ddedbcdd5d44e0d0f88dfa785..a7b966c78a2f62075fb7804f6e96028564dda161 100644
> > --- a/include/linux/gpio/driver.h
> > +++ b/include/linux/gpio/driver.h
> > @@ -528,6 +528,13 @@ struct gpio_chip {
> >          */
> >         int (*of_xlate)(struct gpio_chip *gc,
> >                         const struct of_phandle_args *gpiospec, u32 *flags);
> > +
> > +       /**
> > +        * @of_add_pin_range:
> > +        *
> > +        * Callback to add pin ranges from pinctrl
> > +        */
> 
> Please, make the API contract more specific: describe the return value
> and check it in the call place if it can return errors.
> 
> Also: is this even OF-specific if it doesn't take any OF argument? Why
> not just add_pin_range()?
> 
now, this patch is obsolete, please ignore
it will be replaced by the one sent by LinusW
https://lore.kernel.org/all/20250218-gpio-ranges-fourcell-v1-0-b1f3db6c8036@linaro.org/

> Bart
> 
> 
> > +       int (*of_add_pin_range)(struct gpio_chip *chip);
> >  #endif /* CONFIG_OF_GPIO */
> >  };
> >
> >
> > --
> > 2.48.1
> >
> 

-- 
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55