[PATCH 5/7] dt-bindings: ata: Update ahci bindings with possible per-port interrupts

[sven.auhagen at voleatech.de]

From: Miquel Raynal <miquel.raynal at bootlin.com>

Update bindings to reflect the fact that a SATA IP can either have:
- only one interrupt: in this case an 'interrupts' property is
  declared at the root of the node;
or
- each SATA port can have their own interrupt: in this case there is
  one 'interrupts' property per port/sub-node and none at the root.

Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
Reviewed-by: Rob Herring <robh at kernel.org>
---
 Documentation/devicetree/bindings/ata/ahci-platform.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
index 77091a277642..83d715cbcecd 100644
--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
@@ -49,6 +49,12 @@ And at least one of the following properties:
 - phys		    : reference to the SATA PHY node
 - target-supply     : regulator for SATA target power
 
+Sub-nodes optional properties:
+- interrupts        : <interrupt mapping for SATA ports IRQ>, please
+                      note that either the root SATA node has the
+                      interrupts property, or there is one per SATA
+                      port, but not both at the same time.
+
 Examples:
         sata at ffe08000 {
 		compatible = "snps,spear-ahci";
-- 
2.20.1