0001 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
0002 # # Copyright (c) 2018 Google LLC
0003 # # Copyright (c) 2021 Aspeed Technology Inc.
0004 %YAML 1.2
0005 ---
0006 $id: "http://devicetree.org/schemas/soc/aspeed/uart-routing.yaml#"
0007 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
0008
0009 title: Aspeed UART Routing Controller
0010
0011 maintainers:
0012 - Oskar Senft <osk@google.com>
0013 - Chia-Wei Wang <chiawei_wang@aspeedtech.com>
0014
0015 description:
0016 The Aspeed UART routing control allow to dynamically route the inputs for
0017 the built-in UARTS and physical serial I/O ports.
0018
0019 This allows, for example, to connect the output of UART to another UART.
0020 This can be used to enable Host <-> BMC communication via UARTs, e.g. to
0021 allow access to the Host's serial console.
0022
0023 This driver is for the BMC side. The sysfs files allow the BMC userspace
0024 which owns the system configuration policy, to configure how UARTs and
0025 physical serial I/O ports are routed.
0026
0027 properties:
0028 compatible:
0029 items:
0030 - enum:
0031 - aspeed,ast2400-uart-routing
0032 - aspeed,ast2500-uart-routing
0033 - aspeed,ast2600-uart-routing
0034 reg:
0035 maxItems: 1
0036
0037 required:
0038 - compatible
0039
0040 additionalProperties: false
0041
0042 examples:
0043 - |
0044 lpc: lpc@1e789000 {
0045 compatible = "aspeed,ast2600-lpc-v2", "simple-mfd", "syscon";
0046 reg = <0x1e789000 0x1000>;
0047
0048 #address-cells = <1>;
0049 #size-cells = <1>;
0050 ranges = <0x0 0x1e789000 0x1000>;
0051
0052 uart_routing: uart-routing@98 {
0053 compatible = "aspeed,ast2600-uart-routing";
0054 reg = <0x98 0x8>;
0055 };
0056 };
