From: Wan Zongshun <vincent....@amd.com>

Add ivrs_acpihid kernel parameter description,
like ivrs_acpihid[00:14.5]=AMD0020:0.

Signed-off-by: Wan Zongshun <vincent....@amd.com>
---
 Documentation/kernel-parameters.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/kernel-parameters.txt 
b/Documentation/kernel-parameters.txt
index 742f69d..5c364c6 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1680,6 +1680,13 @@ bytes respectively. Such letter suffixes can also be 
entirely omitted.
                        PCI device 00:14.0 write the parameter as:
                                ivrs_hpet[0]=00:14.0
 
+       ivrs_acpihid    [HW,X86_64]
+                       Provide an override to the ACPI-HID:UID<->DEVICE-ID
+                       mapping provided in the IVRS ACPI table. For
+                       example, to map UART-HID:UID AMD0020:0 to
+                       PCI device 00:14.5 write the parameter as:
+                               ivrs_acpihid[00:14.5]=AMD0020:0
+
        js=             [HW,JOY] Analog joystick
                        See Documentation/input/joystick.txt.
 
-- 
1.9.1

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