From 4d720e2a8c5f5829ca6d79e02f653ca8b1470b8b Mon Sep 17 00:00:00 2001 From: Thomas Preston Date: Mon, 25 Mar 2019 16:53:38 +0000 Subject: 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 Reviewed-by: Andy Shevchenko Acked-by: Mika Westerberg Signed-off-by: Rafael J. Wysocki --- Documentation/acpi/enumeration.txt | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'Documentation/acpi') 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 -- cgit v1.2.3-55-g7522