From 05da213f1c7781407acff10438daf4332407bb52 Mon Sep 17 00:00:00 2001 From: Mikko Perttunen Date: Wed, 23 Jan 2019 11:28:18 +0100 Subject: [PATCH] dt-bindings: serial: Add bindings for nvidia,tegra194-tcu Add bindings for the Tegra Combined UART device used to talk to the UART console on Tegra194 systems. Signed-off-by: Mikko Perttunen Reviewed-by: Rob Herring Acked-by: Jon Hunter Acked-by: Thierry Reding Signed-off-by: Thierry Reding Signed-off-by: Greg Kroah-Hartman --- .../bindings/serial/nvidia,tegra194-tcu.txt | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/serial/nvidia,tegra194-tcu.txt diff --git a/Documentation/devicetree/bindings/serial/nvidia,tegra194-tcu.txt b/Documentation/devicetree/bindings/serial/nvidia,tegra194-tcu.txt new file mode 100644 index 0000000..085a859 --- /dev/null +++ b/Documentation/devicetree/bindings/serial/nvidia,tegra194-tcu.txt @@ -0,0 +1,35 @@ +NVIDIA Tegra Combined UART (TCU) + +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. + +Required properties: +- name : Should be tcu +- compatible + Array of strings + One of: + - "nvidia,tegra194-tcu" +- mbox-names: + "rx" - Mailbox for receiving data from hardware UART + "tx" - Mailbox for transmitting data to hardware UART +- mboxes: Mailboxes corresponding to the mbox-names. + +This node is a mailbox consumer. See the following files for details of +the mailbox subsystem, and the specifiers implemented by the relevant +provider(s): + +- .../mailbox/mailbox.txt +- .../mailbox/nvidia,tegra186-hsp.txt + +Example bindings: +----------------- + +tcu: tcu { + 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"; +}; -- 2.7.4