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
---
Notes:
v2:
- Added Rob's Reviewed-by.
v3:
- Added Jon's Acked-by.
.../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 ..a8becf6efd2a
--- /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";
+};
--
2.16.1
