From: Robert Dolca <robert.dolca@gmail.com>
To: Octavian Purdila <octavian.purdila@intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>,
Linus Walleij <linus.walleij@linaro.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Robert Dolca <robert.dolca@intel.com>,
"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
Jonathan Cameron <jic23@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Peter Meerwald <pmeerw@pmeerw.net>,
Denis CIOCCA <denis.ciocca@st.com>
Subject: Re: [PATCH] IIO: Adds ACPI support for ST gyroscopes
Date: Thu, 26 Mar 2015 12:06:45 +0200 [thread overview]
Message-ID: <CAFPB+Yd01JBe3e-Yk51EJZWvNRC_8SjAwOggZv+gkHvXQ+VQJA@mail.gmail.com> (raw)
In-Reply-To: <CAE1zotJas26oRGdext7V69mNNyaYT3Ds7+Ruhg_kNKBf-Ewoew@mail.gmail.com>
On Wed, Mar 25, 2015 at 11:12 PM, Octavian Purdila
<octavian.purdila@intel.com> wrote:
> On Wed, Mar 25, 2015 at 3:21 PM, Mika Westerberg
> <mika.westerberg@linux.intel.com> wrote:
>> On Wed, Mar 25, 2015 at 02:25:05PM +0200, Mika Westerberg wrote:
>>> I think we can do the same for ACPI GpioInts so that we introduce
>>> acpi_gpio_irq_get() that translates from GpioInt to Linux IRQ
>>> numberspace. Then we can do something like below in I2C core:
>>>
>>> if (client->irq <= 0) {
>>> int irq = -ENOENT;
>>>
>>> if (dev->of_node)
>>> irq = of_irq_get(dev->of_node, 0);
>>> else if (ACPI_COMPANION(dev))
>>> irq = acpi_gpio_irq_get(ACPI_COMPANION(dev), 0);
>>>
>>> if (irq == -EPROBE_DEFER)
>>> return irq;
>>> if (irq < 0)
>>> irq = 0;
>>>
>>> client->irq = irq;
>>> }
>>>
>>> Now it has the drawback that the first GpioInt will not be available to
>>> the driver anymore (as a GPIO since it is locked) but if DT already does
>>> the same we should be fine.
>>
>> Below patch should take care of this.
>>
>
> One issue we noticed is that now the gpio request and set input
> directions operations are not called anymore. Some gpio controller
> drivers (dln2, adnp, lynx_point from quickly browsing the code) do not
> explicitly enable the GPIO pin nor set direction to input when the
> interrupt is enabled. Depending on hardware this may be an issue - it
> is on dln2 for example.
>
> Should the gpio controllers enable and set to input in irq_enable,
> irq_bus_sync_unlock, etc.? Or should this be done in gpiolib?
I've tested the patch and it works if the GPIO pin is enabled in the
controller (which isn't as Octavian said). I believe that the patch
should enable the pin and set the direction before it is used as IRQ.
Robert
next prev parent reply other threads:[~2015-03-26 10:07 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-23 13:40 [PATCH] IIO: Adds ACPI support for ST gyroscopes Robert Dolca
2015-03-23 13:40 ` [PATCH] IIO: Add support for L3GD20H gyroscope Robert Dolca
2015-03-24 10:29 ` Linus Walleij
2015-03-28 11:14 ` Jonathan Cameron
2015-03-23 15:18 ` [PATCH] IIO: Adds ACPI support for ST gyroscopes Mika Westerberg
2015-03-24 11:51 ` Daniel Baluta
2015-03-24 10:22 ` Linus Walleij
2015-03-24 10:37 ` Linus Walleij
2015-03-24 10:44 ` Linus Walleij
2015-03-24 12:17 ` Lars-Peter Clausen
2015-03-24 13:26 ` Robert Dolca
2015-03-24 13:38 ` Lars-Peter Clausen
2015-03-24 13:57 ` Linus Walleij
2015-03-24 15:06 ` Mika Westerberg
2015-03-24 15:22 ` Lars-Peter Clausen
2015-03-24 15:28 ` Daniel Baluta
2015-03-24 15:55 ` Mika Westerberg
2015-03-24 16:43 ` Lars-Peter Clausen
2015-03-24 16:55 ` Mika Westerberg
2015-03-25 8:44 ` Linus Walleij
2015-03-25 9:43 ` Mika Westerberg
2015-03-25 12:25 ` Mika Westerberg
2015-03-25 13:21 ` Mika Westerberg
2015-03-25 13:42 ` Robert Dolca
2015-03-25 18:05 ` sathyanarayanan kuppuswamy
2015-03-25 18:08 ` Lars-Peter Clausen
2015-03-25 21:12 ` Octavian Purdila
2015-03-26 10:06 ` Robert Dolca [this message]
2015-03-26 10:36 ` Mika Westerberg
2015-03-26 10:16 ` Mika Westerberg
2015-03-26 12:04 ` Octavian Purdila
2015-03-26 14:04 ` Mika Westerberg
2015-03-26 14:37 ` Octavian Purdila
2015-03-26 14:47 ` Mika Westerberg
2015-03-26 15:00 ` Octavian Purdila
2015-03-26 16:28 ` Octavian Purdila
2015-03-27 10:06 ` Mika Westerberg
2015-03-27 10:36 ` Linus Walleij
2015-03-30 9:52 ` Mika Westerberg
2015-03-30 12:55 ` Octavian Purdila
2015-03-30 13:33 ` Mika Westerberg
2015-03-30 13:52 ` Octavian Purdila
2015-03-30 14:18 ` Mika Westerberg
2015-04-07 9:35 ` Linus Walleij
2015-04-07 9:39 ` Lars-Peter Clausen
2015-03-26 18:32 ` Jonathan Cameron
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