dt-bindings: aspeed-lpc: Add reset controller

This describes the reset controller present in the LPC address space.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
[p.zabel@pengutronix.de: removed a space before tab in indent]
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

1 files changed, 21 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
index 514d82ced95b..7136432f9905 100644
--- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
+++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
@@ -135,3 +135,24 @@ lhc: lhc@20 {
         compatible = "aspeed,ast2500-lhc";
         reg = <0x20 0x24 0x48 0x8>;
 };
+
+LPC reset control
+-----------------
+
+The UARTs present in the ASPEED SoC can have their resets tied to the reset
+state of the LPC bus. Some systems may chose to modify this configuration.
+
+Required properties:
+
+ - compatible:          "aspeed,ast2500-lpc-reset" or
+                        "aspeed,ast2400-lpc-reset"
+ - reg:                 offset and length of the IP in the LHC memory region
+ - #reset-controller    indicates the number of reset cells expected
+
+Example:
+
+lpc_reset: reset-controller@18 {
+        compatible = "aspeed,ast2500-lpc-reset";
+        reg = <0x18 0x4>;
+        #reset-cells = <1>;
+};