ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 20:51:03 +02:00
Code Issues Packages Projects Releases Wiki Activity

Documentation: acpi: Add an example for PRP0001

Browse Source 
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>
This commit is contained in:
Thomas Preston
2019-03-25 16:53:38 +00:00
committed by Rafael J. Wysocki
parent 8c2ffd9174
commit 4d720e2a8c
1 changed files with 26 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
Documentation/acpi/enumeration.txt
View File

@@ -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 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. 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 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 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 ancestors provides a _DSD with a valid "compatible" property. Such device