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Diffstat (limited to 'Documentation/driver-api/cxl/platform/acpi/dsdt.rst')
| -rw-r--r-- | Documentation/driver-api/cxl/platform/acpi/dsdt.rst | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/driver-api/cxl/platform/acpi/dsdt.rst b/Documentation/driver-api/cxl/platform/acpi/dsdt.rst new file mode 100644 index 000000000000..b4583b01d67d --- /dev/null +++ b/Documentation/driver-api/cxl/platform/acpi/dsdt.rst @@ -0,0 +1,28 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================================== +DSDT - Differentiated system Description Table +============================================== + +This table describes what peripherals a machine has. + +This table's UIDs for CXL devices - specifically host bridges, must be +consistent with the contents of the CEDT, otherwise the CXL driver will +fail to probe correctly. + +Example Compute Express Link Host Bridge :: + + Scope (_SB) + { + Device (S0D0) + { + Name (_HID, "ACPI0016" /* Compute Express Link Host Bridge */) // _HID: Hardware ID + Name (_CID, Package (0x02) // _CID: Compatible ID + { + EisaId ("PNP0A08") /* PCI Express Bus */, + EisaId ("PNP0A03") /* PCI Bus */ + }) + ... + Name (_UID, 0x05) // _UID: Unique ID + ... + } |