On Wed, Jul 19, 2023 at 08:12:33AM +0300, Tony Lindgren wrote:
> The serial core port id should be serial core controller specific port
> instance, which is not always the port->line index.
>
> For example, 8250 driver maps a number of legacy ports, and when a
> hardware specific device driver takes over, we typically have one
> driver instance for each port. Let's instead add port->port_id to
> keep track serial ports mapped to each serial core controller instance.
>
> Currently this is only a cosmetic issue for the serial core port device
> names. The issue can be noticed looking at /sys/bus/serial-base/devices
> for example though. Let's fix the issue to avoid port addressing issues
> later on.
Good catch!
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Fixes: 84a9582fd203 ("serial: core: Start managing serial controllers to enable runtime PM")
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> drivers/tty/serial/8250/8250_core.c | 2 ++
> drivers/tty/serial/serial_base_bus.c | 2 +-
> include/linux/serial_core.h | 1 +
> 3 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
> --- a/drivers/tty/serial/8250/8250_core.c
> +++ b/drivers/tty/serial/8250/8250_core.c
> @@ -497,6 +497,7 @@ static struct uart_8250_port *serial8250_setup_port(int index)
>
> up = &serial8250_ports[index];
> up->port.line = index;
> + up->port.port_id = index;
>
> serial8250_init_port(up);
> if (!base_ops)
> @@ -1040,6 +1041,7 @@ int serial8250_register_8250_port(const struct uart_8250_port *up)
> uart_remove_one_port(&serial8250_reg, &uart->port);
>
> uart->port.ctrl_id = up->port.ctrl_id;
> + uart->port.port_id = up->port.port_id;
> uart->port.iobase = up->port.iobase;
> uart->port.membase = up->port.membase;
> uart->port.irq = up->port.irq;
> diff --git a/drivers/tty/serial/serial_base_bus.c b/drivers/tty/serial/serial_base_bus.c
> --- a/drivers/tty/serial/serial_base_bus.c
> +++ b/drivers/tty/serial/serial_base_bus.c
> @@ -136,7 +136,7 @@ struct serial_port_device *serial_base_port_add(struct uart_port *port,
> err = serial_base_device_init(port, &port_dev->dev,
> &ctrl_dev->dev, &serial_port_type,
> serial_base_port_release,
> - port->line);
> + port->port_id);
> if (err)
> goto err_put_device;
>
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -460,6 +460,7 @@ struct uart_port {
> int (*iso7816_config)(struct uart_port *,
> struct serial_iso7816 *iso7816);
> int ctrl_id; /* optional serial core controller id */
> + int port_id; /* optional serial core port id */
> unsigned int irq; /* irq number */
> unsigned long irqflags; /* irq flags */
> unsigned int uartclk; /* base uart clock */
> --
> 2.41.0
--
With Best Regards,
Andy Shevchenko
