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-rw-r--r--src/arch/x86/include/arch/acpi_device.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/src/arch/x86/include/arch/acpi_device.h b/src/arch/x86/include/arch/acpi_device.h
index b0285d2c23..6e8f812fa0 100644
--- a/src/arch/x86/include/arch/acpi_device.h
+++ b/src/arch/x86/include/arch/acpi_device.h
@@ -24,6 +24,18 @@
#define ACPI_DESCRIPTOR_GPIO (ACPI_DESCRIPTOR_LARGE | 12)
#define ACPI_DESCRIPTOR_SERIAL_BUS (ACPI_DESCRIPTOR_LARGE | 14)
+/*
+ * PRP0001 is a special DT namespace link device ID. It provides a means to use
+ * existing DT-compatible device identification in ACPI. When this _HID is used
+ * by an ACPI device, the ACPI subsystem in OS looks up "compatible" property in
+ * device object's _DSD and will use the value of that property to identify the
+ * corresponding device in analogy with the original DT device identification
+ * algorithm.
+ * More details can be found in Linux kernel documentation:
+ * Documentation/acpi/enumeration.txt
+ */
+#define ACPI_DT_NAMESPACE_HID "PRP0001"
+
struct device;
const char *acpi_device_name(struct device *dev);
const char *acpi_device_path(struct device *dev);