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serial: port: Assign ->iotype correctly when ->iobase is set

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Currently the ->iotype is always assigned to the UPIO_MEM when
the respective property is not found. However, this will not
support the cases when user wants to have UPIO_PORT to be set
or preserved.  Support this scenario by checking ->iobase value
and default the ->iotype respectively.

Fixes: 1117a6fdc7 ("serial: 8250_of: Switch to use uart_read_port_properties()")
Fixes: e894b6005d ("serial: port: Introduce a common helper to read properties")
Cc: stable <stable@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250124161530.398361-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2025-01-24 18:10:46 +02:00 • committed by Greg Kroah-Hartman
parent e8ed246ded
commit 166ac2bba1
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/serial/serial_port.c
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@ -173,6 +173,7 @@ EXPORT_SYMBOL(uart_remove_one_port);
* The caller is responsible to initialize the following fields of the @port
* ->dev (must be valid)
* ->flags
* ->iobase
* ->mapbase
* ->mapsize
* ->regshift (if @use_defaults is false)
@ -214,7 +215,7 @@ static int __uart_read_properties(struct uart_port *port, bool use_defaults)
/* Read the registers I/O access type (default: MMIO 8-bit) */
ret = device_property_read_u32(dev, "reg-io-width", &value);
if (ret) {
port->iotype = UPIO_MEM;
port->iotype = port->iobase ? UPIO_PORT : UPIO_MEM;
} else {
switch (value) {
case 1: