GP1_IO11 controlling issue with DM8168

Bharadwaj Rajan

Other Parts Discussed in Thread: WL1271

Hi,

We have integrated the TI DM8168 with our video processor & we have connected certain GP0 & GP1 pins to our wireless module. We are seeing that we're unable to control specifically GP1_IO11 gpio for some reason & we don't even see it exported in our /sys/class/gpio/.

Here's our board-ti8168evm.c portion of the file for the GPIO initialization:

static struct omap_board_mux board_mux[] __initdata = {

......

TI816X_MUX(SC0_DATA, OMAP_MUX_MODE2), /* gp1_io12 */
TI816X_MUX(SC0_CLK, OMAP_MUX_MODE2), /* gp1_io11 */

};

.......

#define GP1_IO11 (43)
#define GP1_IO12 (44)

static void bii_wl1271_io_init( void )
{
int ret;

    omap_mux_init_signal( "sc0_clk", TI81XX_MUX_PULLDIS );
   //omap_mux_init_gpio ("gp1_io11", 0);
   //ret = gpio_request( GP1_IO11, "bt_host_wake" );
   ret = gpio_request( GP1_IO11, "sc0_clk" );
   if( ret == 0 ) {
           ret = gpio_direction_output( GP1_IO11, 0 );
   }

   if ( ret == 0 ) {
           /* Export to SYSFS */
           ret = gpio_export(GP1_IO11, true);
           gpio_export (43, true);
    }

    //GP1_IO12 - WLAN_CLK_REQ
    omap_mux_init_signal( "gp1_io12", TI81XX_MUX_PULLDIS );
   ret = gpio_request( GP1_IO12, "wlclkreq" );
   if( ret == 0 ) {
       ret = gpio_direction_output( GP1_IO12, 0 );
   }
    if ( ret == 0 ) {
            /* Export to SYSFS */
            ret = gpio_export(GP1_IO12, true);
    }

}

......

On bootup on our board:

root@arago:~# ls /sys/class/gpio/ -l
--w-------    1 root     root         4096 Jan 1 2000 export
lrwxrwxrwx    1 root     root            0 Jan 1 2000 gpio11 -> ../../devices/virtual/gpio/gpio11
lrwxrwxrwx    1 root     root            0 Jan 1 2000 gpio12 -> ../../devices/virtual/gpio/gpio12
lrwxrwxrwx    1 root     root            0 Jan 1 2000 gpio13 -> ../../devices/virtual/gpio/gpio13
lrwxrwxrwx    1 root     root            0 Jan 1 2000 gpio14 -> ../../devices/virtual/gpio/gpio14
lrwxrwxrwx    1 root     root            0 Jan 1 2000 gpio21 -> ../../devices/virtual/gpio/gpio21
lrwxrwxrwx    1 root     root            0 Jan 1 2000 gpio44 -> ../../devices/virtual/gpio/gpio44
lrwxrwxrwx    1 root     root            0 Jan 1 2000 gpio6 -> ../../devices/virtual/gpio/gpio6
lrwxrwxrwx    1 root     root            0 Jan 1 2000 gpiochip0 -> ../../devices/virtual/gpio/gpiochip0
lrwxrwxrwx    1 root     root            0 Jan 1 2000 gpiochip32 -> ../../devices/virtual/gpio/gpiochip32
--w-------    1 root     root         4096 Jan 1 2000 unexport
root@arago:~#

We're not able to figure out why this is happening because we want to control GP1_IO11 pin to toggle the way we like. We tried doing it the way described here for GP1_IO11 & didn't work: http://processors.wiki.ti.com/index.php/GPIO_Driver_Guide#Sysfs_entries_configuration. Any help would be very much appreciated. Thanks for all the wonderful tips in this forum.

Bharadwaj

over 14 years ago

0 Bharadwaj Rajan over 14 years ago

Prodigy 200 points

After I performed a few experiments with the GPIOs, here's what I found:

Case1: If GP1_IO12 is set as an input (basically in our module, we're getting this input from WL1273 as a CLK_REQ signal), then we're not able to control GP1_IO11 at all.

Case2: If GP1_IO12 were set as an output (which we don't want), then we have a handle on GP1_IO11 either through kernel or sysfs.

We are trying to find out why this is happening & what's the expected behavior & why we are unable to control GP1_IO11 for case 1. Thanks,

Bharadwaj

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GP1_IO11 controlling issue with DM8168