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| author | Thomas Preston <thomas.preston@codethink.co.uk> | 2019-03-25 16:53:38 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-03-28 10:30:00 +0100 |
| commit | 4d720e2a8c5f5829ca6d79e02f653ca8b1470b8b (patch) | |
| tree | c706150fdb027327aa5980e1cce1ece71941c581 /Documentation/acpi | |
| parent | 8c2ffd9174779014c3fe1f96d9dc3641d9175f00 (diff) | |
| download | lwn-4d720e2a8c5f5829ca6d79e02f653ca8b1470b8b.tar.gz lwn-4d720e2a8c5f5829ca6d79e02f653ca8b1470b8b.zip | |
Documentation: acpi: Add an example for PRP0001
Add an example for the magic PRP0001 device ID which allows matching
ACPI devices against drivers using OF Device Tree compatible property.
Signed-off-by: Thomas Preston <thomas.preston@codethink.co.uk>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/acpi')
| -rw-r--r-- | Documentation/acpi/enumeration.txt | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/acpi/enumeration.txt b/Documentation/acpi/enumeration.txt index 7bcf9c3d9fbe..1395b844649c 100644 --- a/Documentation/acpi/enumeration.txt +++ b/Documentation/acpi/enumeration.txt @@ -410,6 +410,32 @@ Specifically, the device IDs returned by _HID and preceding PRP0001 in the _CID return package will be checked first. Also in that case the bus type the device will be enumerated to depends on the device ID returned by _HID. +For example, the following ACPI sample might be used to enumerate an lm75-type +I2C temperature sensor and match it to the driver using the Device Tree +namespace link: + + Device (TMP0) + { + Name (_HID, "PRP0001") + Name (_DSD, Package() { + ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + Package () { + Package (2) { "compatible", "ti,tmp75" }, + } + }) + Method (_CRS, 0, Serialized) + { + Name (SBUF, ResourceTemplate () + { + I2cSerialBusV2 (0x48, ControllerInitiated, + 400000, AddressingMode7Bit, + "\\_SB.PCI0.I2C1", 0x00, + ResourceConsumer, , Exclusive,) + }) + Return (SBUF) + } + } + It is valid to define device objects with a _HID returning PRP0001 and without the "compatible" property in the _DSD or a _CID as long as one of their ancestors provides a _DSD with a valid "compatible" property. Such device |