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-rw-r--r--Documentation/devicetree/bindings/soc/aspeed/uart-routing.yaml56
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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# # Copyright (c) 2018 Google LLC
+# # Copyright (c) 2021 Aspeed Technology Inc.
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/soc/aspeed/uart-routing.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Aspeed UART Routing Controller
+
+maintainers:
+ - Oskar Senft <osk@google.com>
+ - Chia-Wei Wang <chiawei_wang@aspeedtech.com>
+
+description:
+ The Aspeed UART routing control allow to dynamically route the inputs for
+ the built-in UARTS and physical serial I/O ports.
+
+ This allows, for example, to connect the output of UART to another UART.
+ This can be used to enable Host <-> BMC communication via UARTs, e.g. to
+ allow access to the Host's serial console.
+
+ This driver is for the BMC side. The sysfs files allow the BMC userspace
+ which owns the system configuration policy, to configure how UARTs and
+ physical serial I/O ports are routed.
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - aspeed,ast2400-uart-routing
+ - aspeed,ast2500-uart-routing
+ - aspeed,ast2600-uart-routing
+ reg:
+ maxItems: 1
+
+required:
+ - compatible
+
+additionalProperties: false
+
+examples:
+ - |
+ lpc: lpc@1e789000 {
+ compatible = "aspeed,ast2600-lpc-v2", "simple-mfd", "syscon";
+ reg = <0x1e789000 0x1000>;
+
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x1e789000 0x1000>;
+
+ uart_routing: uart-routing@98 {
+ compatible = "aspeed,ast2600-uart-routing";
+ reg = <0x98 0x8>;
+ };
+ };