diff options
| author | Furquan Shaikh <furquan@chromium.org> | 2016-12-13 09:43:46 -0800 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-12-16 18:25:59 +0100 |
| commit | c804826be9b528b53fa9d6842f5c4489d7eff924 (patch) | |
| tree | e4bc9aa197d4546e070e35d5d90cd6221623cfe4 /src | |
| parent | ca80196ae21fcd5e305e9f0e4d12fdb3a78ab7be (diff) | |
acpi_device: Add special HID for DT namespace
BUG=chrome-os-partner:60194
BRANCH=None
TEST=Compiles successfully
Change-Id: I0fe146cf2235c7c4ad3ea5589ed556884de3a368
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17842
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/x86/include/arch/acpi_device.h | 12 |
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); |