Re: Device node at /dev/tty* not getting created for uart serial driver

[Manavendra Nath Manav <mnm.kernel@xxxxxxxxx>]

On Sat, Nov 24, 2012 at 2:20 PM, Manavendra Nath Manav <mnm.kernel@xxxxxxxxx> wrote:

Hi RK

On Sat, Nov 24, 2012 at 2:03 PM, Manavendra Nath Manav <mnm.kernel@xxxxxxxxx> wrote:

I have written a simple UART serial driver in embedded Linux running busybox with mdev rules. I have provided .dev_name as "ttyC2C" in my driver code.

static struct uart_driver serial_omap_reg = {
   .owner      = THIS_MODULE,
   .driver_name   = "Omap-C2C-Serial",
   .dev_name   = "ttyC2C",
   .nr      = OMAP_MAX_HSUART_PORTS,
   .cons    = NULL,
};

However the node is getting created in

./sys/devices/platform/omap_c2c_uart.0/tty/ttyC2C0
./sys/class/tty/ttyC2C0

/ # ls -l ./sys/class/tty/ttyC2C0
lrwxrwxrwx    1 root     0                0 Jan  1 00:14 ./sys/class/tty/ttyC2C0 -> ../../devices/platform/omap_c2c_uart.0/tty/ttyC2C0

/ # ls -l ./sys/devices/platform/omap_c2c_uart.0/tty/ttyC2C0
-r--r--r--    1 root     0             4096 Jan  1 00:14 dev
lrwxrwxrwx    1 root     0                0 Jan  1 00:14 device -> ../../../omap_c2c_uart.0
drwxr-xr-x    2 root     0                0 Jan  1 00:14 power
lrwxrwxrwx    1 root     0                0 Jan  1 00:14 subsystem -> ../../../../../class/tty
-rw-r--r--    1 root     0             4096 Jan  1 00:14 uevent
/ #

The mdev rules for tty are:

tty 0:5 0666
tty.* 0:0 0620

How to get device node as /dev/ttyC2C ?

--
Manavendra Nath Manav

can you help me on following issue?

--
Manavendra Nath Manav

In "Essential Linux Device Drivers" book, it says that that the driver name in "struct platform_driver" and "struct uart_driver" should be same. I modified the code according but still /dev/ttyC2C node is not being populated.

--
Manavendra Nath Manav

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