linux-kernel - Re: [PATCH v8 4/6] gpio: gpiolib: Allow free() callback to be overridden

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Date:   Sun, 10 Jul 2022 09:52:36 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Prabhakar <prabhakar.csengg@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        devicetree <devicetree@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v8 4/6] gpio: gpiolib: Allow free() callback to be overridden

On Fri, 08 Jul 2022 16:52:21 +0100,
Bartosz Golaszewski <brgl@...ev.pl> wrote:
> 
> On Thu, Jul 7, 2022 at 8:24 PM <prabhakar.csengg@...il.com> wrote:
> >
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Allow free() callback to be overridden from irq_domain_ops for
> > hierarchical chips.
> >
> > This allows drivers to free up resources which are allocated during
> > child_to_parent_hwirq()/populate_parent_alloc_arg() callbacks.
> >
> > On Renesas RZ/G2L platform a bitmap is maintained for TINT slots, a slot
> > is allocated in child_to_parent_hwirq() callback which is freed up in free
> > callback hence this override.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> > ---
> >  drivers/gpio/gpiolib.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> > index bfde94243752..68d9f95d7799 100644
> > --- a/drivers/gpio/gpiolib.c
> > +++ b/drivers/gpio/gpiolib.c
> > @@ -1181,15 +1181,18 @@ static void gpiochip_hierarchy_setup_domain_ops(struct irq_domain_ops *ops)
> >         ops->activate = gpiochip_irq_domain_activate;
> >         ops->deactivate = gpiochip_irq_domain_deactivate;
> >         ops->alloc = gpiochip_hierarchy_irq_domain_alloc;
> > -       ops->free = irq_domain_free_irqs_common;
> >
> >         /*
> > -        * We only allow overriding the translate() function for
> > +        * We only allow overriding the translate() and free() functions for
> >          * hierarchical chips, and this should only be done if the user
> > -        * really need something other than 1:1 translation.
> > +        * really need something other than 1:1 translation for translate()
> > +        * callback and free if user wants to free up any resources which
> > +        * were allocated during callbacks, for example populate_parent_alloc_arg.
> >          */
> >         if (!ops->translate)
> >                 ops->translate = gpiochip_hierarchy_irq_domain_translate;
> > +       if (!ops->free)
> > +               ops->free = irq_domain_free_irqs_common;
> >  }
> >
> >  static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc)
> > --
> > 2.25.1
> >
> 
> Acked-by: Bartosz Golaszewski <brgl@...ev.pl>
> 
> Which tree is this targetting?
> 

Given the various dependencies, I've created a stable branch[1] on top
of -rc3, and merged the whole thing into irq/irqchip-next.

Feel free to pull the branch in the GPIO tree as well.

Thanks,

	M.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=irq/renesas-irqc

-- 
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