[PATCH v3 4/6] mfd: dt: Add bindings for the Aspeed LPC Host Controller (LHC)

The LPC bus pinmux configuration on fifth generation Aspeed SoCs depends
on bits in both the System Control Unit and the LPC Host Controller.

The Aspeed LPC Host Controller is described as a child node of the
LPC host-range syscon device for arbitration of access by the host
controller and pinmux drivers.

Signed-off-by: Andrew Jeffery <redacted>
---
 .../devicetree/bindings/mfd/aspeed-lpc.txt         | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
index a97131aba446..9de318ef72da 100644
--- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
+++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt

@@ -109,3 +109,25 @@ lpc: lpc at 1e789000 {
 	};
 };
 
+Host Node Children
+==================
+
+LPC Host Controller
+-------------------
+
+The Aspeed LPC Host Controller configures the Low Pin Count (LPC) bus behaviour
+between the host and the baseboard management controller. The registers exist
+in the "host" portion of the Aspeed LPC controller, which must be the parent of
+the LPC host controller node.
+
+Required properties:
+- compatible:		"aspeed,ast2500-lhc";
+- reg:			contains offset/length value of the LHC memory
+			region.