[U-Boot] am335x: using GPIO1 pins as input

[Yegor Yefremov]

U-Boot 2014.07

I'm trying to use ping 44..47 as input. I've configured PINMUX and
invoked request, direction etc. I always get 0 from gpio_get_value()

        int val;

        gpio_request(44, "dip_s1"):
        gpio_request(45, "dip_s2");
        gpio_request(46, "dip_s3");
        gpio_request(47, "dip_s4");

        gpio_direction_input(44);
        gpio_direction_input(45);
        gpio_direction_input(46);
        gpio_direction_input(47);

        val = gpio_get_value(44);
        printf("DIP value: %d\n", val);
        val = gpio_get_value(45);
        printf("DIP value: %d\n", val);
        val = gpio_get_value(46);
        printf("DIP value: %d\n", val);
        val = gpio_get_value(47);
        printf("DIP value: %d\n", val);

After reading http://e2e.ti.com/support/arm/sitara_arm/f/791/t/248181.aspx
I've checked clock registers CM_PER_L4LS_CLKSTCTRL (bit 8 L4LS_GCLK
is set) and also CM_PER_GPIO1_CLKCTRL has value 2 - enabled. I can
also see, that arch/arm/cpu/armv7/am33xx/clock_am33xx.c->enable_basic_clocks()
enables clocks for GPIO1.

Then I checked GPIO1 specific registers and found out, that
GPIO_SYSSTATUS (0x4804C114) shows 0x00000000 i.e. GPIO is still in
reset. Any idea, what should be activated/setup in order to get the
second GPIO bank working?

Thanks.

Yegor