openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

tty/serial: at91: restore dynamic driver binding 

In commit c39dfebc77, the modular support
code for atmel_serial was removed, as the driver cannot be built as a
module. Because no use case was proposed, the dynamic driver binding
support was removed as well.

The atmel_serial driver can manage up to 7 serial controllers, which are
multiplexed with other functions. For example, in the Atmel SAMA5D2, the
Flexcom controllers can work as USART, SPI or I2C controllers, and on
all Atmel devices serial lines can be reconfigured as GPIOs.

My use case uses GPIOs to transfer a firmware update using a custom
protocol on the lines used as a serial port during the normal life of
the device. If it is not possible to unbind the atmel_serial driver, the
GPIO lines remain reserved and prevent this case from working.

This patch reinstates the atmel_serial_remove function, and fixes it as
it failed to clear the "clk" field on removal, triggering an oops when
a device was bound again after being unbound.

Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Romain Izard 2016-02-26 11:15:04 +01:00 committed by Greg Kroah-Hartman
parent 8d2acdb9fc
commit f4a8ab04dd
1 changed files with 34 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/tty/serial/atmel_serial.c
View File

@ -2761,14 +2761,47 @@ static int atmel_serial_probe(struct platform_device *pdev)
return ret;
}
/*
* Even if the driver is not modular, it makes sense to be able to
* unbind a device: there can be many bound devices, and there are
* situations where dynamic binding and unbinding can be useful.
*
* For example, a connected device can require a specific firmware update
* protocol that needs bitbanging on IO lines, but use the regular serial
* port in the normal case.
*/
static int atmel_serial_remove(struct platform_device *pdev)
{
struct uart_port *port = platform_get_drvdata(pdev);
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
int ret = 0;
tasklet_kill(&atmel_port->tasklet);
device_init_wakeup(&pdev->dev, 0);
ret = uart_remove_one_port(&atmel_uart, port);
kfree(atmel_port->rx_ring.buf);
/* "port" is allocated statically, so we shouldn't free it */
clear_bit(port->line, atmel_ports_in_use);
clk_put(atmel_port->clk);
atmel_port->clk = NULL;
return ret;
}
static struct platform_driver atmel_serial_driver = {
.probe = atmel_serial_probe,
.remove = atmel_serial_remove,
.suspend = atmel_serial_suspend,
.resume = atmel_serial_resume,
.driver = {
.name = "atmel_usart",
.of_match_table = of_match_ptr(atmel_serial_dt_ids),
.suppress_bind_attrs = true,
},
};