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serial: Add Tegra Combined UART driver

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The Tegra Combined UART (TCU) is a mailbox-based mechanism that allows
multiplexing multiple "virtual UARTs" into a single hardware serial
port. The TCU is the primary serial port on Tegra194 devices.

Add a TCU driver utilizing the mailbox framework, as the used mailboxes
are part of Tegra HSP blocks that are already controlled by the Tegra
HSP mailbox driver.

Based on work by  Mikko Perttunen <mperttunen@nvidia.com>.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thierry Reding 2019-01-23 11:28:19 +01:00 • committed by Greg Kroah-Hartman
parent 05da213f1c
commit 2d908b38d4
4 changed files with 324 additions and 0 deletions
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3
include/uapi/linux/serial_core.h
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@ -79,6 +79,9 @@
/* Nuvoton UART */
#define PORT_NPCM 40
/* NVIDIA Tegra Combined UART */
#define PORT_TEGRA_TCU 41
/* Intel EG20 */
#define PORT_PCH_8LINE 44
#define PORT_PCH_2LINE 45