Signed-off-by: Cyril Bur <cyrilbur@xxxxxxxxx>
---
.../devicetree/bindings/misc/aspeed-lpc-ctrl.txt | 78 ++++++++++++++++++++++
1 file changed, 78 insertions(+)
create mode 100644 Documentation/devicetree/bindings/misc/aspeed-lpc-ctrl.txt
diff --git a/Documentation/devicetree/bindings/misc/aspeed-lpc-ctrl.txt b/Documentation/devicetree/bindings/misc/aspeed-lpc-ctrl.txt
new file mode 100644
index 000000000000..f84ac83211ec
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/aspeed-lpc-ctrl.txt
@@ -0,0 +1,78 @@
+ASpeed LPC Control
+==================
+This binding defines the LPC control for ASpeed SoCs. Partitions of
+the LPC bus can be access by other processors on the system, address
+ranges on the bus can map accesses from another processor to regions
+of the ASpeed SoC memory space.
+
+Reserved Memory:
+================
+The driver provides functionality to map the LPC bus to a region of
+ASpeed ram. A phandle to a reserved memory node must be provided so
+that the driver can safely use this region.
+
+Flash:
+======
+The driver provides functionality to unmap the LPC bus from ASpeed
+RAM, historically the default mapping has been to the SPI flash
+controller on the ASpeed SoC, a phandle to this node should be
+supplied.
+
+Device Node:
+============
+
+As LPC bus configuration registers are at the start of the LPC bus
+memory space, it makes most sense for the device to be within the LPC
+host node. See Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
+for more information. This does not have to be the case, provided the
+reg property can give the full address of the LPC bus.
+
+Required properties:
+--------------------
+
+- compatible: "aspeed,ast2400-lpc-ctrl" for ASpeed ast2400 SoCs
+ "aspeed,ast2500-lpc-ctrl" for ASpeed ast2500 SoCs
+
+- reg: Location and size of the configuration registers
+ for the LPC bus. Note that if the device node is
+ within the LPC host node then base is relative to
+ that.
+
+- memory-region: phandle of the reserved memory region
+- flash: phandle of the SPI flash controller
+
+Example:
+--------
+
+reserved-memory {
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ ...
+
+ flash_memory: region@54000000 {
+ compatible = "aspeed,ast2400-lpc-ctrl";
+ no-map;
+ reg = <0x54000000 0x04000000>; /* 64M */
+ };
+};
+
+host_pnor: spi@1e630000 {
+ reg = < 0x1e630000 0x18
+ 0x30000000 0x02000000 >;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "aspeed,ast2400-smc";
+
+ ...
+
+};
+
+lpc-ctrl@0 {
+ compatible = "aspeed,ast2400-lpc-ctrl";
+ memory-region = <&flash_memory>;
+ flash = <&host_pnor>;
+ reg = <0x0 0x80>;
+};
+
--
2.11.0
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