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[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / ata / ahci-platform.txt

diff --git a/kernel/Documentation/devicetree/bindings/ata/ahci-platform.txt b/kernel/Documentation/devicetree/bindings/ata/ahci-platform.txt
index c2340ee..c000832 100644 (file)
--- a/kernel/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/kernel/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -30,6 +30,10 @@ Optional properties:
 - target-supply     : regulator for SATA target power
 - phys              : reference to the SATA PHY node
 - phy-names         : must be "sata-phy"
+- ports-implemented : Mask that indicates which ports that the HBA supports
+                     are available for software to use. Useful if PORTS_IMPL
+                     is not programmed by the BIOS, which is true with
+                     some embedded SOC's.
 
 Required properties when using sub-nodes:
 - #address-cells    : number of cells to encode an address