linux-kernel - Re: [PATCH v2 2/2] gpiolib: Show more info for interrupt only lines in debugfs

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Date: Fri, 31 May 2024 13:19:56 +0200
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v2 2/2] gpiolib: Show more info for interrupt only lines in debugfs

Hi,

Am Donnerstag, 30. Mai 2024, 21:12:30 CEST schrieb Andy Shevchenko:
> Show more info for interrupt only lines in debugfs. It's useful
> to monitor the lines that have been never requested as GPIOs,
> but IRQs.

I was trying to test this on TQMa8MPQL (i.MX8MP) using gpio-mxc.c.
But apparently this series only has an effect when gpiochip_lock_as_irq()
is called eventually. I'm wondering what needs to be done so IRQ only
GPIOs are listed in debugfs. Using irq_request_resources/irq_release_resources
similar to what pinctrl-at91.c is doing?

Best regards,
Alexander

> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/gpio/gpiolib.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index a6032b84ba98..f3b2f5c4781d 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -4888,11 +4888,11 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
>  
>  	for_each_gpio_desc(gc, desc) {
>  		guard(srcu)(&desc->gdev->desc_srcu);
> -		if (test_bit(FLAG_REQUESTED, &desc->flags)) {
> +		is_irq = test_bit(FLAG_USED_AS_IRQ, &desc->flags);
> +		if (is_irq || test_bit(FLAG_REQUESTED, &desc->flags)) {
>  			gpiod_get_direction(desc);
>  			is_out = test_bit(FLAG_IS_OUT, &desc->flags);
>  			value = gpio_chip_get_value(gc, desc);
> -			is_irq = test_bit(FLAG_USED_AS_IRQ, &desc->flags);
>  			active_low = test_bit(FLAG_ACTIVE_LOW, &desc->flags);
>  			seq_printf(s, " gpio-%-3u (%-20.20s|%-20.20s) %s %s %s%s\n",
>  				   gpio, desc->name ?: "", gpiod_get_label(desc),
> 


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