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From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Grant Likely <grant.likely@linaro.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Aaron Lu <aaron.lu@intel.com>,
	devicetree@vger.kernel.org,
	Linus Walleij <linus.walleij@linaro.org>,
	Alexandre Courbot <gnurou@gmail.com>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Bryan Wu <cooloney@gmail.com>, Arnd Bergmann <arnd@arndb.de>,
	Darren Hart <dvhart@linux.intel.com>,
	Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH 06/13] gpio / ACPI: Add support for _DSD device properties
Date: Wed, 15 Oct 2014 11:46:20 +0300	[thread overview]
Message-ID: <20141015084620.GO2255@lahna.fi.intel.com> (raw)
In-Reply-To: <20141014134403.66480C408A6@trevor.secretlab.ca>

On Tue, Oct 14, 2014 at 03:44:03PM +0200, Grant Likely wrote:
> On Tue, 07 Oct 2014 02:15:18 +0200
> , "Rafael J. Wysocki" <rjw@rjwysocki.net>
>  wrote:
> > From: Mika Westerberg <mika.westerberg@linux.intel.com>
> > 
> > With release of ACPI 5.1 and _DSD method we can finally name GPIOs (and
> > other things as well) returned by _CRS. Previously we were only able to
> > use integer index to find the corresponding GPIO, which is pretty error
> > prone if the order changes.
> > 
> > With _DSD we can now query GPIOs using name instead of an integer index,
> > like the below example shows:
> > 
> >   // Bluetooth device with reset and shutdown GPIOs
> >   Device (BTH)
> >   {
> >       Name (_HID, ...)
> > 
> >       Name (_CRS, ResourceTemplate ()
> >       {
> >           GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionInputOnly,
> >                   "\\_SB.GPO0", 0, ResourceConsumer) {15}
> >           GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionInputOnly,
> >                   "\\_SB.GPO0", 0, ResourceConsumer) {27, 31}
> >       })
> > 
> >       Name (_DSD, Package ()
> >       {
> >           ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> >           Package ()
> > 	  {
> >               Package () {"reset-gpio", Package() {^BTH, 1, 1, 0 }},
> >               Package () {"shutdown-gpio", Package() {^BTH, 0, 0, 0 }},
> >           }
> >       })
> >   }
> > 
> > The format of the supported GPIO property is:
> > 
> >   Package () { "name", Package () { ref, index, pin, active_low }}
> > 
> >   ref - The device that has _CRS containing GpioIo()/GpioInt() resources,
> >         typically this is the device itself (BTH in our case).
> >   index - Index of the GpioIo()/GpioInt() resource in _CRS starting from zero.
> >   pin - Pin in the GpioIo()/GpioInt() resource. Typically this is zero.
> >   active_low - If 1 the GPIO is marked as active_low.
> > 
> > Since ACPI GpioIo() resource does not have field saying whether it is
> > active low or high, the "active_low" argument can be used here. Setting
> > it to 1 marks the GPIO as active low.
> > 
> > In our Bluetooth example the "reset-gpio" refers to the second GpioIo()
> > resource, second pin in that resource with the GPIO number of 31.
> > 
> > This patch implements necessary support to gpiolib for extracting GPIOs
> > using _DSD device properties.
> 
> Patch looks good, but please put the above description into
> /Documentation until we've got a better place to document extra bindings.

Thanks for the review.

If you don't mind, I would like to make a separate patch on top of this
series adding this description to Documentation/acpi/properties.txt.

  reply	other threads:[~2014-10-15  8:46 UTC|newest]

Thread overview: 104+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-07  0:10 [PATCH v4 00/13] Add ACPI _DSD and unified device properties support Rafael J. Wysocki
2014-10-07  0:12 ` [PATCH 01/13] ACPI: Add support for device specific properties Rafael J. Wysocki
2014-10-13 12:47   ` Grant Likely
2014-10-07  0:12 ` [PATCH 02/13] Driver core: Unified device properties interface for platform firmware Rafael J. Wysocki
2014-10-07  0:13 ` [PATCH 03/13] ACPI: Allow drivers to match using Device Tree compatible property Rafael J. Wysocki
2014-10-14 13:38   ` Grant Likely
2014-10-07  0:14 ` [PATCH 04/13] ACPI: Document ACPI device specific properties Rafael J. Wysocki
2014-10-13 12:41   ` Grant Likely
2014-10-14  9:42     ` Mika Westerberg
2014-10-07  0:14 ` [PATCH 05/13] misc: at25: Make use of device property API Rafael J. Wysocki
2014-10-07  9:10   ` Geert Uytterhoeven
2014-10-07  9:32     ` Mika Westerberg
2014-10-07  0:15 ` [PATCH 06/13] gpio / ACPI: Add support for _DSD device properties Rafael J. Wysocki
2014-10-14 13:44   ` Grant Likely
2014-10-15  8:46     ` Mika Westerberg [this message]
2014-10-07  0:15 ` [PATCH 07/13] gpio: sch: Consolidate core and resume banks Rafael J. Wysocki
2014-10-07  0:16 ` [PATCH 08/13] leds: leds-gpio: Add support for GPIO descriptors Rafael J. Wysocki
2014-10-07  0:16 ` [PATCH 09/12] input: gpio_keys_polled - " Rafael J. Wysocki
2014-10-07 17:29   ` Dmitry Torokhov
2014-10-07  0:17 ` [PATCH 10/13] Driver core: Child node properties for devices Rafael J. Wysocki
2014-10-07  0:18 ` [PATCH 11/13] gpio: Support for unified device properties interface Rafael J. Wysocki
2014-10-07 10:22   ` Alexandre Courbot
2014-10-07 10:40     ` Mika Westerberg
2014-10-07 10:52       ` Alexandre Courbot
2014-10-08  0:09         ` Rafael J. Wysocki
2014-10-08  2:55           ` Alexandre Courbot
2014-10-08 14:01             ` Rafael J. Wysocki
2014-10-07  0:18 ` [PATCH 12/13] leds: leds-gpio: Make use of device property API Rafael J. Wysocki
2014-10-08 14:04   ` Rafael J. Wysocki
2014-10-08 17:47     ` Bryan Wu
2014-10-08 22:02       ` Rafael J. Wysocki
2014-10-07  0:19 ` [PATCH 13/13] input: gpio_keys_polled - " Rafael J. Wysocki
2014-10-07 17:30   ` Dmitry Torokhov
2014-10-07  0:39 ` [PATCH v4 00/13] Add ACPI _DSD and unified device properties support Rafael J. Wysocki
2014-10-07  2:28 ` Greg Kroah-Hartman
2014-10-15 13:04 ` David Woodhouse
2014-10-15 13:15   ` Mark Rutland
2014-10-15 13:28     ` David Woodhouse
2014-10-15 13:42       ` Mark Rutland
2014-10-15 14:08         ` David Woodhouse
2014-10-15 14:46           ` Darren Hart
2014-10-15 15:11             ` David Woodhouse
2014-10-15 15:17             ` Mark Rutland
2014-10-15 15:43               ` Darren Hart
2014-10-16 10:05                 ` Rafael J. Wysocki
2014-10-16 14:55                 ` David Woodhouse
2014-10-18  8:37                   ` Grant Likely
2014-10-18  8:39                   ` Grant Likely
2014-10-18  8:35                 ` Grant Likely
2014-10-21 21:50                   ` [PATCH v4 00/13] Add ACPI _DSD and unified device properties? support Darren Hart
2015-01-14 18:42     ` [PATCH v4 00/13] Add ACPI _DSD and unified device properties support David Woodhouse
2015-01-15  9:12       ` Rafael J. Wysocki
2014-10-17 12:01 ` [PATCH v5 00/12] " Rafael J. Wysocki
2014-10-17 12:03   ` [PATCH v5 01/12] ACPI: Add support for device specific properties Rafael J. Wysocki
2014-10-17 12:04   ` [PATCH v5 02/12] Driver core: Unified device properties interface for platform firmware Rafael J. Wysocki
2014-10-20  0:07     ` [Update][PATCH " Rafael J. Wysocki
2014-10-17 12:05   ` [PATCH v5 03/12] ACPI: Allow drivers to match using Device Tree compatible property Rafael J. Wysocki
2014-10-20 14:05     ` Grant Likely
2014-10-20 22:19       ` Rafael J. Wysocki
2014-10-17 12:07   ` [PATCH v5 04/12] misc: at25: Make use of device property API Rafael J. Wysocki
2014-10-17 12:09   ` [PATCH v5 05/12] gpio / ACPI: Add support for _DSD device properties Rafael J. Wysocki
2014-10-17 12:10   ` [PATCH v5 06/12] gpio: sch: Consolidate core and resume banks Rafael J. Wysocki
2014-10-17 12:11   ` [PATCH v5 07/12] leds: leds-gpio: Add support for GPIO descriptors Rafael J. Wysocki
2014-10-28 15:26     ` Linus Walleij
2014-10-28 21:56       ` Rafael J. Wysocki
2014-10-29  8:53         ` Mika Westerberg
2014-10-30 15:40           ` Linus Walleij
2014-10-30 16:15             ` Mika Westerberg
2014-10-31  9:41               ` Linus Walleij
2014-10-31  9:55                 ` Mika Westerberg
2014-10-30 15:34         ` Linus Walleij
2014-10-17 12:12   ` [PATCH v5 08/12] input: gpio_keys_polled - " Rafael J. Wysocki
2014-10-17 12:14   ` [PATCH v5 09/12] Driver core: Unified interface for firmware node properties Rafael J. Wysocki
2014-10-18  9:35     ` Arnd Bergmann
2014-10-19 23:30       ` Rafael J. Wysocki
2014-10-20 14:14         ` Arnd Bergmann
2014-10-18 14:55     ` Grant Likely
2014-10-19 23:46       ` Rafael J. Wysocki
2014-10-20 14:18         ` Grant Likely
2014-10-20 22:14           ` Rafael J. Wysocki
2014-10-20 14:19         ` Arnd Bergmann
2014-10-20 14:55           ` Grant Likely
2014-10-20 22:22           ` Rafael J. Wysocki
2014-10-19 22:14     ` Greg Kroah-Hartman
2014-10-19 23:31       ` Rafael J. Wysocki
2014-10-20  0:15     ` [Update][PATCH " Rafael J. Wysocki
2014-10-17 12:16   ` [PATCH v5 10/12] gpio: Support for unified device properties interface Rafael J. Wysocki
2014-10-17 18:09     ` Arnd Bergmann
2014-10-18  9:47       ` Arnd Bergmann
2014-10-19 23:58         ` Rafael J. Wysocki
2014-10-20 14:22           ` Arnd Bergmann
2014-10-20  6:12         ` Alexandre Courbot
2014-10-20 14:26           ` Arnd Bergmann
2014-10-17 12:17   ` [PATCH v5 11/12] leds: leds-gpio: Make use of device property API Rafael J. Wysocki
2014-10-17 12:18   ` [PATCH v5 12/12] input: gpio_keys_polled - " Rafael J. Wysocki
2014-10-17 12:22   ` [PATCH v5 00/12] Add ACPI _DSD and unified device properties support Rafael J. Wysocki
2014-10-17 15:40   ` Greg Kroah-Hartman
2014-10-17 19:23     ` Darren Hart
2014-10-17 21:49     ` Rafael J. Wysocki
2014-10-19 22:14       ` Greg Kroah-Hartman
2014-10-17 18:04   ` Arnd Bergmann
2014-10-17 22:50     ` Rafael J. Wysocki
2014-10-18  8:49       ` Grant Likely
2014-10-19 23:32         ` Rafael J. Wysocki

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