linux-kernel - Re: [PATCH] gpio: mxc: Only getting second IRQ when there is more than one IRQ

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Date:   Thu, 19 Sep 2019 09:18:01 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Anson Huang <Anson.Huang@....com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        dl-linux-imx <Linux-imx@....com>
Subject: Re: [PATCH] gpio: mxc: Only getting second IRQ when there is more
 than one IRQ

czw., 19 wrz 2019 o 08:10 Anson Huang <Anson.Huang@....com> napisał(a):
>
> On some of i.MX SoCs like i.MX8QXP, there is ONLY one IRQ for each
> GPIO bank, so it is better to check the IRQ count before getting
> second IRQ to avoid below error message during probe:
>
> [    1.070908] gpio-mxc 5d080000.gpio: IRQ index 1 not found
> [    1.077420] gpio-mxc 5d090000.gpio: IRQ index 1 not found
> [    1.083766] gpio-mxc 5d0a0000.gpio: IRQ index 1 not found
> [    1.090122] gpio-mxc 5d0b0000.gpio: IRQ index 1 not found
> [    1.096470] gpio-mxc 5d0c0000.gpio: IRQ index 1 not found
> [    1.102804] gpio-mxc 5d0d0000.gpio: IRQ index 1 not found
> [    1.109144] gpio-mxc 5d0e0000.gpio: IRQ index 1 not found
> [    1.115475] gpio-mxc 5d0f0000.gpio: IRQ index 1 not found
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  drivers/gpio/gpio-mxc.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
> index 7907a87..39ba7dd 100644
> --- a/drivers/gpio/gpio-mxc.c
> +++ b/drivers/gpio/gpio-mxc.c
> @@ -426,9 +426,15 @@ static int mxc_gpio_probe(struct platform_device *pdev)
>         if (IS_ERR(port->base))
>                 return PTR_ERR(port->base);
>
> -       port->irq_high = platform_get_irq(pdev, 1);
> -       if (port->irq_high < 0)
> -               port->irq_high = 0;
> +       err = platform_irq_count(pdev);
> +       if (err < 0)
> +               return err;
> +
> +       if (err > 1) {

Could you use a variable called irq_count or something here? This
'err' is a confusing name for a variable that contains a valid value.

Bart

> +               port->irq_high = platform_get_irq(pdev, 1);
> +               if (port->irq_high < 0)
> +                       port->irq_high = 0;
> +       }
>
>         port->irq = platform_get_irq(pdev, 0);
>         if (port->irq < 0)
> --
> 2.7.4
>