nvidia,tegra194-tcu.txt

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    1 NVIDIA Tegra Combined UART (TCU)
    2 
    3 The TCU is a system for sharing a hardware UART instance among multiple
    4 systems within the Tegra SoC. It is implemented through a mailbox-
    5 based protocol where each "virtual UART" has a pair of mailboxes, one
    6 for transmitting and one for receiving, that is used to communicate
    7 with the hardware implementing the TCU.
    8 
    9 Required properties:
   10 - name : Should be tcu
   11 - compatible
   12     Array of strings
   13     One of:
   14     - "nvidia,tegra194-tcu"
   15 - mbox-names:
   16     "rx" - Mailbox for receiving data from hardware UART
   17     "tx" - Mailbox for transmitting data to hardware UART
   18 - mboxes: Mailboxes corresponding to the mbox-names.
   19 
   20 This node is a mailbox consumer. See the following files for details of
   21 the mailbox subsystem, and the specifiers implemented by the relevant
   22 provider(s):
   23 
   24 - .../mailbox/mailbox.txt
   25 - .../mailbox/nvidia,tegra186-hsp.txt
   26 
   27 Example bindings:
   28 -----------------
   29 
   30 tcu: tcu {
   31         compatible = "nvidia,tegra194-tcu";
   32         mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_SM 0>,
   33                  <&hsp_aon TEGRA_HSP_MBOX_TYPE_SM 1>;
   34         mbox-names = "rx", "tx";
   35 };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/serial/nvidia,tegra194-tcu.txt

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sys/contrib/device-tree/Bindings/serial/nvidia,tegra194-tcu.txt