linux-kernel - Re: [PATCH] gpio: mpc8xxx: Fix support for IRQ_TYPE_LEVEL_LOW flow

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Date:   Wed, 7 Sep 2022 13:17:48 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Pali Rohár <pali@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: mpc8xxx: Fix support for IRQ_TYPE_LEVEL_LOW
 flow_type in mpc85xx

On Tue, Sep 6, 2022 at 12:54 PM Pali Rohár <pali@...nel.org> wrote:
>
> Commit e39d5ef67804 ("powerpc/5xxx: extend mpc8xxx_gpio driver to support
> mpc512x gpios") implemented support for IRQ_TYPE_LEVEL_LOW flow type in
> mpc512x via falling edge type. Do same for mpc85xx which support was added
> in commit 345e5c8a1cc3 ("powerpc: Add interrupt support to mpc8xxx_gpio").
>
> Fixes probing of lm90 hwmon driver on mpc85xx based board which use level
> interrupt. Without it kernel prints error and refuse lm90 to work:
>
>     [   15.258370] genirq: Setting trigger mode 8 for irq 49 failed (mpc8xxx_irq_set_type+0x0/0xf8)
>     [   15.267168] lm90 0-004c: cannot request IRQ 49
>     [   15.272708] lm90: probe of 0-004c failed with error -22
>
> Fixes: 345e5c8a1cc3 ("powerpc: Add interrupt support to mpc8xxx_gpio")
> Signed-off-by: Pali Rohár <pali@...nel.org>
> ---
>  drivers/gpio/gpio-mpc8xxx.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
> index a964e25ea620..763256efddc2 100644
> --- a/drivers/gpio/gpio-mpc8xxx.c
> +++ b/drivers/gpio/gpio-mpc8xxx.c
> @@ -172,6 +172,7 @@ static int mpc8xxx_irq_set_type(struct irq_data *d, unsigned int flow_type)
>
>         switch (flow_type) {
>         case IRQ_TYPE_EDGE_FALLING:
> +       case IRQ_TYPE_LEVEL_LOW:
>                 raw_spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
>                 gc->write_reg(mpc8xxx_gc->regs + GPIO_ICR,
>                         gc->read_reg(mpc8xxx_gc->regs + GPIO_ICR)
> --
> 2.20.1
>

Applied, thanks!

Bart