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+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/nvidia,tegra194-tcu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra Combined UART (TCU)
+
+maintainers:
+ - Thierry Reding <thierry.reding@gmail.com>
+ - Jonathan Hunter <jonathanh@nvidia.com>
+
+description:
+ The TCU is a system for sharing a hardware UART instance among multiple
+ systems within the Tegra SoC. It is implemented through a mailbox-
+ based protocol where each "virtual UART" has a pair of mailboxes, one
+ for transmitting and one for receiving, that is used to communicate
+ with the hardware implementing the TCU.
+
+properties:
+ $nodename:
+ pattern: "^serial(@.*)?$"
+
+ compatible:
+ oneOf:
+ - const: nvidia,tegra194-tcu
+ - items:
+ - enum:
+ - nvidia,tegra234-tcu
+ - const: nvidia,tegra194-tcu
+
+ mbox-names:
+ items:
+ - const: rx
+ - const: tx
+
+ mboxes:
+ description: |
+ List of phandles to mailbox channels used for receiving and
+ transmitting data from and to the hardware UART.
+ items:
+ - description: mailbox for receiving data from hardware UART
+ - description: mailbox for transmitting data to hardware UART
+
+required:
+ - compatible
+ - mbox-names
+ - mboxes
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/mailbox/tegra186-hsp.h>
+
+ tcu: serial {
+ compatible = "nvidia,tegra194-tcu";
+ mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_SM 0>,
+ <&hsp_aon TEGRA_HSP_MBOX_TYPE_SM 1>;
+ mbox-names = "rx", "tx";
+ };