[RFC PATCH 0/9] Add ACPI _DSD and unified device properties support

From: Mika Westerberg
Date: Sun Aug 17 2014 - 02:05:21 EST

[ Resending with fewer people in CC list. For some reason the series never
reached attented mailing lists. ]

The recent publication of the ACPI 5.1 specification [1] adds a reserved name
for Device Specific Data (_DSD, Section 6.2.5). This mechanism allows for
passing arbitrary hardware description data to the OS. The exact format of the
_DSD data is specific to the UUID paired with it [2].

An ACPI Device Properties UUID has been defined [3] to provide a format
compatible with existing device tree schemas. The purpose for this was to allow
for the reuse of the existing schemas and encourage the development of firmware
agnostic device drivers.

This series accomplishes the following (as well as some other dependencies):

* Add _DSD support to the ACPI core
This simply reads the UUID and the accompanying Package

* Add ACPI Device Properties _DSD format support
This understands the hierarchical key:value pair structure
defined by the Device Properties UUID

* Add a unified device properties API with ACPI and OF backends
This provides for the firmware agnostic device properties
Interface to be used by drivers

* Provides 2 example drivers that were previously Device Tree aware that
can now be used with either Device Tree or ACPI Device Properties. The
both drivers use an arbitrary _HID.

This has been tested on Minnowboard with relevant parts of the modified
DSDT at the end of this email.

This series does not provide for a means to append to a system DSDT. That
will ultimately be required to make the most effective use of the _DSD
mechanism. Work is underway on that as a separate effort.

[1] http://www.uefi.org/sites/default/files/resources/ACPI_5_1release.pdf
[2] http://www.uefi.org/sites/default/files/resources/_DSD-implementation-guide-toplevel.htm
[3] http://www.uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf

Aaron Lu (3):
of: Add property_ops callback for devices with of_node
gpiolib: add API to get gpio desc and flags
Input: gpio_keys_polled - Make use of device property API

Max Eliaser (1):
leds: leds-gpio: Make use of device property API

Mika Westerberg (4):
ACPI: Add support for device specific properties
ACPI: Document ACPI device specific properties
mfd: Add ACPI support
gpio: sch: Consolidate core and resume banks

Rafael J. Wysocki (1):
Driver core: Unified device properties interface for platform firmware

Documentation/acpi/enumeration.txt | 27 ++
Documentation/acpi/properties.txt | 359 ++++++++++++++++++++
drivers/acpi/Makefile | 1 +
drivers/acpi/glue.c | 4 +-
drivers/acpi/internal.h | 6 +
drivers/acpi/property.c | 542 ++++++++++++++++++++++++++++++
drivers/acpi/scan.c | 14 +-
drivers/base/Makefile | 2 +-
drivers/base/property.c | 48 +++
drivers/gpio/gpio-sch.c | 303 ++++++-----------
drivers/gpio/gpiolib-acpi.c | 81 +++--
drivers/gpio/gpiolib.c | 18 +
drivers/gpio/gpiolib.h | 8 +
drivers/input/keyboard/gpio_keys_polled.c | 139 +++++---
drivers/leds/leds-gpio.c | 130 ++++---
drivers/mfd/mfd-core.c | 41 +++
drivers/of/base.c | 194 ++++++++++-
drivers/of/platform.c | 4 +-
include/acpi/acpi_bus.h | 8 +
include/linux/acpi.h | 40 +++
include/linux/device.h | 3 +
include/linux/gpio/consumer.h | 11 +
include/linux/mfd/core.h | 3 +
include/linux/property.h | 54 +++
24 files changed, 1716 insertions(+), 324 deletions(-)
create mode 100644 Documentation/acpi/properties.txt
create mode 100644 drivers/acpi/property.c
create mode 100644 drivers/base/property.c
create mode 100644 include/linux/property.h

------ DSDT For Minnowboard ------

Scope (\_SB.PCI0.LPC)
{
Device (LEDS)
{
Name (_HID, "MNW0001")

Name (_CRS, ResourceTemplate ()
{
GpioIo (Exclusive, PullDown, 0, 0, IoRestrictionOutputOnly,
"\\_SB.PCI0.LPC", 0, ResourceConsumer) {10}
GpioIo (Exclusive, PullDown, 0, 0, IoRestrictionOutputOnly,
"\\_SB.PCI0.LPC", 0, ResourceConsumer) {11}
})

Device (LEDH)
{
Name (_HID, "PRP0000")
Name (_DSD, Package ()
{
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package ()
{
Package () {"label", "Heartbeat"},
Package () {"gpios", Package () {^^LEDS, 0, 0, 0}},
Package () {"linux,default-trigger", "heartbeat"},
Package () {"linux,default-state", "off"},
Package () {"linux,retain-state-suspended", 1},
}
})
}

Device (LEDM)
{
Name (_HID, "PRP0000")
Name (_DSD, Package ()
{
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package ()
{
Package () {"label", "MMC0 Activity"},
Package () {"gpios", Package () {^^LEDS, 1, 0, 0}},
Package () {"linux,default-trigger", "mmc0"},
Package () {"linux,default-state", "on"},
Package () {"linux,retain-state-suspended", 1},
}
})
}
}

Device (BTNS)
{
Name (_HID, "MNW0002")

Name (_CRS, ResourceTemplate ()
{
GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionInputOnly,
"\\_SB.PCI0.LPC", 0, ResourceConsumer) {0}
GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionInputOnly,
"\\_SB.PCI0.LPC", 0, ResourceConsumer) {1}
GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionInputOnly,
"\\_SB.PCI0.LPC", 0, ResourceConsumer) {2}
GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionInputOnly,
"\\_SB.PCI0.LPC", 0, ResourceConsumer) {3}
})

Name (_DSD, Package ()
{
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package ()
{
Package () {"poll-interval", 100},
Package () {"autorepeat", 1}
}
})

Device (BTN0)
{
Name (_HID, "PRP0000")
Name (_DSD, Package ()
{
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package ()
{
Package () {"linux,code", 105},
Package () {"linux,input-type", 1},
Package () {"gpios", Package () {^^BTNS, 0, 0, 1}},
}
})
}

Device (BTN1)
{
Name (_HID, "PRP0000")
Name (_DSD, Package ()
{
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package ()
{
Package () {"linux,code", 108},
Package () {"linux,input-type", 1},
Package () {"gpios", Package (4) {^^BTNS, 1, 0, 1}},
}
})
}

Device (BTN2)
{
Name (_HID, "PRP0000")
Name (_DSD, Package ()
{
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package ()
{
Package () {"linux,code", 103},
Package () {"linux,input-type", 1},
Package () {"gpios", Package () {^^BTNS, 2, 0, 1}},
}
})
}

Device (BTN3)
{
Name (_HID, "PRP0000")
Name (_DSD, Package ()
{
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package ()
{
Package () {"linux,code", 106},
Package () {"linux,input-type", 1},
Package () {"gpios", Package (4) {^^BTNS, 3, 0, 1}},
}
})
}

}

}

--
2.1.0.rc1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/