From: Linus Walleij <linus.walleij@linaro.org>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Asmaa Mnebhi <asmaa@nvidia.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
netdev <netdev@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
"David S. Miller" <davem@davemloft.net>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
David Thompson <davthompson@nvidia.com>
Subject: Re: [PATCH v3 1/2] gpio: mlxbf2: Introduce IRQ support
Date: Sat, 25 Sep 2021 01:48:00 +0200 [thread overview]
Message-ID: <CACRpkdbUJF6VUPk9kCMPBvjeL3frJAbHq+h0-z7P-a1pSU+fiw@mail.gmail.com> (raw)
In-Reply-To: <YU26lIUayYXU/x9l@lunn.ch>
On Fri, Sep 24, 2021 at 1:46 PM Andrew Lunn <andrew@lunn.ch> wrote:
> > +static int
> > +mlxbf2_gpio_irq_set_type(struct irq_data *irqd, unsigned int type)
> > +{
> > + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
> > + struct mlxbf2_gpio_context *gs = gpiochip_get_data(gc);
> > + int offset = irqd_to_hwirq(irqd);
> > + unsigned long flags;
> > + bool fall = false;
> > + bool rise = false;
> > + u32 val;
> > +
> > + switch (type & IRQ_TYPE_SENSE_MASK) {
> > + case IRQ_TYPE_EDGE_BOTH:
> > + case IRQ_TYPE_LEVEL_MASK:
> > + fall = true;
> > + rise = true;
> > + break;
> > + case IRQ_TYPE_EDGE_RISING:
> > + case IRQ_TYPE_LEVEL_HIGH:
> > + rise = true;
> > + break;
> > + case IRQ_TYPE_EDGE_FALLING:
> > + case IRQ_TYPE_LEVEL_LOW:
> > + fall = true;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
>
> I'm still not convinced this is correct. Rising edge is different to
> high. Rising edge only ever interrupts once, level keeps interrupting
> until the source is cleared. You cannot store the four different
> options in two bits.
>
> Linus, have you seen anything like this before?
No, and I agree it looks weird.
There must be some explanation, what does the datasheet say?
Yours,
Linus Walleij
next prev parent reply other threads:[~2021-09-24 23:48 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-23 20:22 [PATCH v3 0/2] gpio: mlxbf2: Introduce proper interrupt handling Asmaa Mnebhi
2021-09-23 20:22 ` [PATCH v3 1/2] gpio: mlxbf2: Introduce IRQ support Asmaa Mnebhi
2021-09-24 11:46 ` Andrew Lunn
2021-09-24 23:48 ` Linus Walleij [this message]
2021-09-27 14:04 ` Asmaa Mnebhi
2021-09-27 14:08 ` Andrew Lunn
2021-09-27 14:19 ` Asmaa Mnebhi
2021-09-27 14:26 ` Asmaa Mnebhi
2021-09-27 14:56 ` Andrew Lunn
2021-09-27 15:52 ` Asmaa Mnebhi
2021-09-27 19:10 ` Andrew Lunn
2021-09-29 19:14 ` Asmaa Mnebhi
2021-09-28 15:02 ` Asmaa Mnebhi
2021-09-29 20:24 ` Andrew Lunn
2021-10-08 14:47 ` Asmaa Mnebhi
2021-09-23 20:22 ` [PATCH v3 2/2] net: mellanox: mlxbf_gige: Replace non-standard interrupt handling Asmaa Mnebhi
-- strict thread matches above, loose matches on Subject: below --
2021-09-23 20:18 [PATCH v3 0/2] gpio: mlxbf2: Introduce proper " Asmaa Mnebhi
2021-09-23 20:18 ` [PATCH v3 1/2] gpio: mlxbf2: Introduce IRQ support Asmaa Mnebhi
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