| # 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"; |
| }; |
