linux-kernel - Re: [PATCH] pinctrl: renesas: rzg2l: Always call rzg2l_gpio

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Message-ID: <CA+V-a8v-zumfwm4q7icQxwB60SXetGogNOi0fBBFZRQwTsTxEw@mail.gmail.com>
Date: Thu, 3 Oct 2024 16:32:08 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Linus Walleij <linus.walleij@...aro.org>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH] pinctrl: renesas: rzg2l: Always call rzg2l_gpio_request()
 for interrupt pins

Hi Geert,

On Thu, Oct 3, 2024 at 2:46 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Thu, Oct 3, 2024 at 3:16 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Ensure that rzg2l_gpio_request() is called for GPIO pins configured as
> > interrupts, regardless of whether they are muxed in u-boot. This
> > guarantees that the pinctrl core is aware of the GPIO pin usage via
> > pinctrl_gpio_request(), which is invoked through rzg2l_gpio_request().
> >
> > Fixes: 2fd4fe19d0150 ("pinctrl: renesas: rzg2l: Configure interrupt input mode")
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Thanks for your patch!
>
> > Output before this patch on G2L/SMARC:
> > root@...rc-rzg2l:~# cat /sys/kernel/debug/pinctrl/11030000.pinctrl-pinctrl-rzg2l/pinmux-pins | grep P2_1
> > pin 17 (P2_1): UNCLAIMED
> >
> > Output after this patch G2L/SMARC:
> > root@...rc-rzg2l:~# cat /sys/kernel/debug/pinctrl/11030000.pinctrl-pinctrl-rzg2l/pinmux-pins | grep P2_1
> > pin 17 (P2_1): GPIO 11030000.pinctrl:529
>
> Just wondering: is this restored to UNCLAIMED after releasing the
> interrupt (i.e. after unbinding the ADV7535 driver)?
>
Actually it doesn't report `UNCLAIMED` after `modprobe -r adv7511`,
pinmux-pins reports P2_1 is claimed 11030000.pinctrl:529. `modprobe
adv7511` later succeeds though (maybe because it's the same device).
rzg2l_gpio_free() is called from the rzg2l_gpio_irq_domain_free()
path, either this path is not being called when IRQ is freed or the
adv7511 isn't releasing the IRQ.

Cheers,
Prabhakar