From: Linus Walleij <linus.walleij@linaro.org>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alexandre Courbot <gnurou@gmail.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Bryan Wu <cooloney@gmail.com>, Lee Jones <lee.jones@linaro.org>,
Grant Likely <grant.likely@linaro.org>,
Arnd Bergmann <arnd@arndb.de>, Aaron Lu <aaron.lu@intel.com>,
Darren Hart <dvhart@linux.intel.com>
Subject: Re: [RFC PATCH v2 06/16] gpio / ACPI: Add support for _DSD device properties
Date: Tue, 23 Sep 2014 17:27:19 +0200 [thread overview]
Message-ID: <CACRpkdaMboJa4e7PyxDQCFX_+a0Odr57i-00qs0bJePkBqfaYQ@mail.gmail.com> (raw)
In-Reply-To: <1410868367-11056-7-git-send-email-mika.westerberg@linux.intel.com>
On Tue, Sep 16, 2014 at 1:52 PM, Mika Westerberg
<mika.westerberg@linux.intel.com> wrote:
> 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.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
If Rafael is happy with this approach, and you decide to take it
through the ACPI tree.
Yours,
Linus Walleij
next prev parent reply other threads:[~2014-09-23 15:27 UTC|newest]
Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-16 11:52 [RFC PATCH v2 00/16] Add ACPI _DSD and unified device properties support Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 01/16] ACPI: Add support for device specific properties Mika Westerberg
2014-10-06 13:50 ` Grant Likely
2014-10-06 14:32 ` Mika Westerberg
2014-10-06 16:25 ` Darren Hart
2014-09-16 11:52 ` [RFC PATCH v2 02/16] Driver core: Unified device properties interface for platform firmware Mika Westerberg
2014-09-17 18:28 ` Greg Kroah-Hartman
2014-09-16 11:52 ` [RFC PATCH v2 03/16] ACPI: Allow drivers to match using Device Tree compatible property Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 04/16] ACPI: Document ACPI device specific properties Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 05/16] mfd: Add ACPI support Mika Westerberg
2014-09-16 21:54 ` Lee Jones
2014-09-24 12:00 ` Lee Jones
2014-09-16 11:52 ` [RFC PATCH v2 06/16] gpio / ACPI: Add support for _DSD device properties Mika Westerberg
2014-09-23 15:27 ` Linus Walleij [this message]
2014-09-16 11:52 ` [RFC PATCH v2 07/16] gpio: Add support for unified device properties interface Mika Westerberg
2014-09-23 15:25 ` Linus Walleij
2014-09-23 15:45 ` Arnd Bergmann
2014-09-23 15:52 ` Mika Westerberg
2014-09-23 16:17 ` Dmitry Torokhov
2014-09-23 20:31 ` Rafael J. Wysocki
2014-09-23 16:25 ` Rafael J. Wysocki
2014-09-23 16:26 ` Arnd Bergmann
2014-09-23 20:47 ` Rafael J. Wysocki
2014-09-24 7:55 ` Arnd Bergmann
2014-09-24 14:08 ` Rafael J. Wysocki
2014-09-23 21:15 ` Darren Hart
2014-09-24 9:12 ` Arnd Bergmann
2014-09-24 9:38 ` Mika Westerberg
2014-09-24 14:11 ` Rafael J. Wysocki
2014-09-26 3:21 ` Darren Hart
2014-09-26 8:36 ` Arnd Bergmann
2014-09-26 14:42 ` Rafael J. Wysocki
2014-10-07 13:37 ` Linus Walleij
2014-10-07 15:37 ` Andy Shevchenko
2014-10-07 23:57 ` Rafael J. Wysocki
2014-09-16 11:52 ` [RFC PATCH v2 08/16] gpio: sch: Consolidate core and resume banks Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 09/16] leds: leds-gpio: Add support for GPIO descriptors Mika Westerberg
2014-09-19 8:18 ` Alexandre Courbot
2014-09-24 7:55 ` Linus Walleij
2014-09-24 9:42 ` Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 10/16] leds: leds-gpio: Make use of device property API Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 11/16] leds: leds-gpio: Add ACPI probing support Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 12/16] input: gpio_keys_polled - Add support for GPIO descriptors Mika Westerberg
2014-09-19 8:22 ` Alexandre Courbot
2014-09-24 8:02 ` Linus Walleij
2014-09-16 11:52 ` [RFC PATCH v2 13/16] input: gpio_keys_polled - Make use of device property API Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 14/16] input: gpio_keys_polled - Add ACPI probing support Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 15/16] misc: at25: Make use of device property API Mika Westerberg
2014-09-16 11:52 ` [RFC PATCH v2 16/16] misc: at25: Add ACPI probing support Mika Westerberg
2014-09-21 0:26 ` [RFC PATCH v2 00/16] Add ACPI _DSD and unified device properties support Rafael J. Wysocki
2014-09-24 8:34 ` Lee Jones
2014-09-24 9:45 ` Mika Westerberg
2014-09-22 23:29 ` Bryan Wu
2014-10-01 2:08 ` [PATCH v3 00/15] " Rafael J. Wysocki
2014-10-01 2:08 ` [PATCH v3 01/15] ACPI: Add support for device specific properties Rafael J. Wysocki
2014-10-01 7:38 ` Arnd Bergmann
2014-10-01 2:10 ` [PATCH v3 02/15] Driver core: Unified device properties interface for platform firmware Rafael J. Wysocki
2014-10-01 7:47 ` Arnd Bergmann
2014-10-01 22:09 ` Rafael J. Wysocki
2014-10-01 23:01 ` Rafael J. Wysocki
2014-10-02 7:46 ` Arnd Bergmann
2014-10-02 16:50 ` Rafael J. Wysocki
2014-10-02 0:03 ` Greg Kroah-Hartman
2014-10-01 2:10 ` [PATCH v3 03/15] ACPI: Allow drivers to match using Device Tree compatible property Rafael J. Wysocki
2014-10-01 7:48 ` Arnd Bergmann
2014-10-03 13:43 ` Mark Rutland
2014-10-03 17:59 ` Dmitry Torokhov
2014-10-04 0:02 ` Rafael J. Wysocki
2014-10-01 2:11 ` [PATCH v3 04/15] ACPI: Document ACPI device specific properties Rafael J. Wysocki
2014-10-01 7:59 ` Arnd Bergmann
2014-10-02 10:41 ` Mika Westerberg
2014-10-02 11:51 ` Arnd Bergmann
2014-10-02 12:15 ` Mika Westerberg
2014-10-02 12:46 ` Arnd Bergmann
2014-10-02 13:36 ` Mika Westerberg
2014-10-02 14:29 ` Arnd Bergmann
2014-10-02 14:38 ` Mika Westerberg
2014-10-02 14:55 ` Arnd Bergmann
2014-10-03 13:56 ` Mark Rutland
2014-10-03 15:02 ` Arnd Bergmann
2014-10-03 23:58 ` Rafael J. Wysocki
2014-10-04 10:56 ` Arnd Bergmann
2014-10-05 21:40 ` Rafael J. Wysocki
2014-10-03 2:03 ` Rafael J. Wysocki
2014-10-03 8:12 ` Mika Westerberg
2014-10-03 13:58 ` Mark Rutland
2014-10-03 14:38 ` Rafael J. Wysocki
2014-10-03 14:35 ` Mark Rutland
2014-10-04 0:13 ` Rafael J. Wysocki
2014-10-04 10:59 ` Arnd Bergmann
2014-10-05 22:26 ` Rafael J. Wysocki
2014-10-03 13:48 ` Mark Rutland
2014-10-04 0:16 ` Rafael J. Wysocki
2014-10-01 2:12 ` [PATCH v3 05/15] gpio / ACPI: Add support for _DSD device properties Rafael J. Wysocki
2014-10-01 8:03 ` Arnd Bergmann
2014-10-05 10:36 ` Alexandre Courbot
2014-10-05 21:20 ` Rafael J. Wysocki
2014-10-01 2:14 ` [PATCH v3 06/15] gpio: Support for unified device properties interface Rafael J. Wysocki
2014-10-01 2:15 ` [PATCH v3 07/15] gpio: sch: Consolidate core and resume banks Rafael J. Wysocki
2014-10-01 2:15 ` [PATCH v3 08/15] leds: leds-gpio: Add support for GPIO descriptors Rafael J. Wysocki
2014-10-01 8:05 ` Arnd Bergmann
2014-10-01 2:16 ` [PATCH v3 09/15] leds: leds-gpio: Make use of device property API Rafael J. Wysocki
2014-10-03 14:07 ` Mark Rutland
2014-10-04 0:18 ` Rafael J. Wysocki
2014-10-01 2:17 ` [PATCH v3 10/15] leds: leds-gpio: Add ACPI probing support Rafael J. Wysocki
2014-10-01 8:13 ` Arnd Bergmann
2014-10-01 9:13 ` Mika Westerberg
2014-10-01 10:01 ` Arnd Bergmann
2014-10-01 11:59 ` Mika Westerberg
2014-10-01 13:52 ` Arnd Bergmann
2014-10-01 14:04 ` Mika Westerberg
2014-10-01 14:14 ` Arnd Bergmann
2014-10-02 9:55 ` Mika Westerberg
2014-10-02 10:44 ` Arnd Bergmann
2014-10-01 16:30 ` Dmitry Torokhov
2014-10-01 18:11 ` Darren Hart
2014-10-01 18:21 ` Dmitry Torokhov
2014-10-01 18:22 ` Arnd Bergmann
2014-10-01 2:17 ` [PATCH v3 11/15] input: gpio_keys_polled - Add support for GPIO descriptors Rafael J. Wysocki
2014-10-01 8:13 ` Arnd Bergmann
2014-10-01 2:20 ` [PATCH v3 12/15] input: gpio_keys_polled - Make use of device property API Rafael J. Wysocki
2014-10-01 2:20 ` [PATCH v3 13/15] input: gpio_keys_polled - Add ACPI probing support Rafael J. Wysocki
2014-10-01 7:48 ` Dmitry Torokhov
2014-10-01 9:15 ` Mika Westerberg
2014-10-01 16:28 ` Dmitry Torokhov
2014-10-02 9:53 ` Mika Westerberg
2014-10-01 2:21 ` [PATCH v3 14/15] misc: at25: Make use of device property API Rafael J. Wysocki
2014-10-01 8:14 ` Arnd Bergmann
2014-10-01 2:22 ` [PATCH v3 15/15] misc: at25: Add ACPI probing support Rafael J. Wysocki
2014-10-01 8:15 ` Arnd Bergmann
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