| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/serial/nvidia,tegra194-tcu.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: NVIDIA Tegra Combined UART (TCU) |
| 8 | |
| 9 | maintainers: |
| 10 | - Thierry Reding <thierry.reding@gmail.com> |
| 11 | - Jonathan Hunter <jonathanh@nvidia.com> |
| 12 | |
| 13 | description: |
| 14 | The TCU is a system for sharing a hardware UART instance among multiple |
| 15 | systems within the Tegra SoC. It is implemented through a mailbox- |
| 16 | based protocol where each "virtual UART" has a pair of mailboxes, one |
| 17 | for transmitting and one for receiving, that is used to communicate |
| 18 | with the hardware implementing the TCU. |
| 19 | |
| 20 | properties: |
| 21 | $nodename: |
| 22 | pattern: "^serial(@.*)?$" |
| 23 | |
| 24 | compatible: |
| 25 | oneOf: |
| 26 | - const: nvidia,tegra194-tcu |
| 27 | - items: |
| 28 | - enum: |
| 29 | - nvidia,tegra234-tcu |
| 30 | - const: nvidia,tegra194-tcu |
| 31 | |
| 32 | mbox-names: |
| 33 | items: |
| 34 | - const: rx |
| 35 | - const: tx |
| 36 | |
| 37 | mboxes: |
| 38 | description: | |
| 39 | List of phandles to mailbox channels used for receiving and |
| 40 | transmitting data from and to the hardware UART. |
| 41 | items: |
| 42 | - description: mailbox for receiving data from hardware UART |
| 43 | - description: mailbox for transmitting data to hardware UART |
| 44 | |
| 45 | required: |
| 46 | - compatible |
| 47 | - mbox-names |
| 48 | - mboxes |
| 49 | |
| 50 | additionalProperties: false |
| 51 | |
| 52 | examples: |
| 53 | - | |
| 54 | #include <dt-bindings/mailbox/tegra186-hsp.h> |
| 55 | |
| 56 | tcu: serial { |
| 57 | compatible = "nvidia,tegra194-tcu"; |
| 58 | mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_SM 0>, |
| 59 | <&hsp_aon TEGRA_HSP_MBOX_TYPE_SM 1>; |
| 60 | mbox-names = "rx", "tx"; |
| 61 | }; |