GPIO control from spl binary

Hi Gokul,

You have to add one more declaration to define the direction of this GPIO. This you can make with: gpio_direction_output();
And so to can you control some gpio you have to initialize like that:

ret = gpio_request(GPIO_xxx, "xxx");
ret = gpio_direction_output(GPIO_xxx, value); or gpio_direction_input(GPIO_xxx);

val = gpio_get_value(GPIO_xxx);
or
gpio_set_value(GPIO_xxx, value);

BR
Ivan

Hi,
I had done that also .

My actual intention is to avoid SPL version print if I press a push button at start-up.
This is my code snippet from spl.c

#include <asm/gpio.h>
#include <asm/io.h>


void preloader_console_init(void)
{
int value = 0;

gd->bd = &bdata;
gd->baudrate = CONFIG_BAUDRATE;

serial_init(); /* serial communications setup */

gd->have_console = 1;

puts("\START:\n");

gpio_request(30, " ");
gpio_direction_input(30);
value = gpio_get_value(30);
if(value)
{
puts("\nU-Boot SPL: " PLAIN_VERSION " (" U_BOOT_DATE " - " \
U_BOOT_TIME ")\n");
}

#ifdef CONFIG_SPL_DISPLAY_PRINT
spl_display_print();
#endif
}


I am only getting START print to console . But SPL hangs @ GPIO section added . And u-boot is also not loading .If I comment gpio related function everything working fine .

Thanks and regards
Gokul CG

Hi Gokul,

Could you see if this pin is initialized in this place as GPIO or some other functionality.

BR
Ivan

Hi Gokul,

I put reading of GPIO code of end of SPL code and MLO not hanging. You have to choose the well place.

BR
Ivan

Hi Ivan,

I don't know where it should place . Whats the last function executed by SPL/MLO ? is it last function inside s_init() ,that is sdram_init();

BR
Gokul

Hi Ivan,
Thank you Ivan .

Its working on later parts of the code . So probably as you said "some clock or power were not initialized in this moment". Can anyone point out where is regs/clocks required for gpio module is getting initialized ?

Thanks and regards
Gokul CG