dt-bindings: aspeed: Add UART routing controller

      - interrupts

      - snoop-ports

  "^uart-routing@[0-9a-f]+$":

    $ref: /schemas/soc/aspeed/uart-routing.yaml#

    description: The UART routing control under LPC register space

required:

  - compatible

  - reg

# 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>;

        };

    };