linux.git/drivers/tty/serial/8250, branch v6.15

treewide: Switch/rename to timer_delete[_sync]()

2025-04-05T08:30:12+00:00

timer_delete[_sync]() replaces del_timer[_sync](). Convert the whole tree
over and remove the historical wrapper inlines.

Conversion was done with coccinelle plus manual fixups where necessary.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

serial: 8250: add driver for NI UARTs

2025-03-20T15:13:00+00:00

The National Instruments (NI) 16550 is a 16550-like UART with larger
FIFOs and embedded RS-232/RS-485 transceiver control circuitry. This
patch adds a driver that can operate this UART, which is used for
onboard serial ports in several NI embedded controller designs.

Portions of this driver were originally written by Jaeden Amero and
Karthik Manamcheri, with extensive cleanups and refactors since by
Brenda Streiff.

Cc: Gratian Crisan 
Co-developed-by: Jason Smith 
Signed-off-by: Jason Smith 
Signed-off-by: Chaitanya Vadrevu 
Link: https://lore.kernel.org/r/a3b0df6d-1dd5-4cc4-a7e1-4ed51fb9e4cc@emerson.com
Signed-off-by: Greg Kroah-Hartman

serial: 8250_dma: terminate correct DMA in tx_dma_flush()

2025-03-20T15:07:42+00:00

When flushing transmit side DMA, it is the transmit channel that should
be terminated, not the receive channel.

Fixes: 9e512eaaf8f40 ("serial: 8250: Fix fifo underflow on flush")
Cc: stable 
Reported-by: Wentao Guan 
Signed-off-by: John Keeping 
Reviewed-by: Ilpo Järvinen 
Link: https://lore.kernel.org/r/20250224121831.1429323-1-jkeeping@inmusicbrands.com
Signed-off-by: Greg Kroah-Hartman

tty: serial: 8250: Add Brainboxes XC devices

2025-03-20T15:06:34+00:00

These ExpressCard devices use the OxPCIE chip and can be used with
this driver.

Signed-off-by: Cameron Williams 
Cc: stable 
Link: https://lore.kernel.org/r/DB7PR02MB3802907A9360F27F6CD67AAFC4D62@DB7PR02MB3802.eurprd02.prod.outlook.com
Signed-off-by: Greg Kroah-Hartman

tty: serial: 8250: Add some more device IDs

2025-03-20T15:05:41+00:00

These card IDs got missed the first time around.

Cc: stable 
Signed-off-by: Cameron Williams 
Link: https://lore.kernel.org/r/DB7PR02MB380295BCC879CCF91315AC38C4C12@DB7PR02MB3802.eurprd02.prod.outlook.com
Signed-off-by: Greg Kroah-Hartman

serial: 8250_dw: Comment possible corner cases in serial_out() implementation

2025-03-20T15:05:27+00:00

8250 DesignWare driver uses a few custom implementations of the serial_out().
These implementations are carefully made to avoid infinite loops. But this is
not obvious from looking at the code. Comment the possible corner cases in
the respective functions.

Signed-off-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20250317094021.1201512-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman

serial: 8250_port: simplify serial8250_request_std_resource()

2025-03-20T15:00:52+00:00

Return immediately from the error locations or switch-case ends. It is
therefore easier to see the flow.

Signed-off-by: Jiri Slaby (SUSE) 
Link: https://lore.kernel.org/r/20250317070046.24386-31-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman

serial: 8250_port: do not use goto for UPQ_NO_TXEN_TEST code flow

2025-03-20T15:00:52+00:00

This is unnecessary here and makes the code harder to follow. Invert the
condition and drop the goto+label.

Signed-off-by: Jiri Slaby (SUSE) 
Link: https://lore.kernel.org/r/20250317070046.24386-30-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman

serial: 8250_rsa: simplify rsa8250_{request/release}_resource()

2025-03-20T15:00:52+00:00

* Use already defined 'port' for fetching start/offset, and size.
* Return from the switch immediately -- so it is clear what is returned
  and when.

Signed-off-by: Jiri Slaby (SUSE) 
Link: https://lore.kernel.org/r/20250317070046.24386-29-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman

serial: 8250: use serial_port_in/out() helpers

2025-03-20T15:00:52+00:00

There are serial_port_in/out() helpers to be used instead of direct
p->serial_in/out(). Use them in various 8250 drivers.

Signed-off-by: Jiri Slaby (SUSE) 
Cc: "Ilpo Järvinen" 
Cc: Andy Shevchenko 

--
[v2]
* Use serial_port_in/out() and not serial_in/out() [Andy]

Reviewed-by: Andy Shevchenko  # 8250_dw
Link: https://lore.kernel.org/r/20250317070046.24386-28-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman