Hi Community,
I'm working on i.MX6 Quad sabre-SD platform and build Android 6 as my image.
I'm trying to control GPIO in u-boot.
According to my customize u-boot, I modify bootload/bootloader/u-boot/board/freescale/FX100/FX100.c like below.
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#define FX_GPIO_INIT (PAD_CTL_PUS_100K_DOWN)
static void enable_lvds(struct display_info_t const *dev)
{
/* LVDS_PWR_ON */
imx_iomux_v3_setup_pad(MX6_PAD_NANDF_CS2__GPIO6_IO15 | MUX_PAD_CTRL(FX_GPIO_INIT));
/* LVDS_BL_ON */
imx_iomux_v3_setup_pad(MX6_PAD_NANDF_CS3__GPIO6_IO16 | MUX_PAD_CTRL(FX_GPIO_INIT));
/* PAD_SD1_DAT3 for pwm ,GPIO mode */
imx_iomux_v3_setup_pad(MX6_PAD_SD1_DAT3__GPIO1_IO21 | MUX_PAD_CTRL(FX_GPIO_INIT));
gpio_direction_output(BL_PWM, 0);// winmate BL pwm to low level
gpio_direction_output(LVDS_PWR_ON, 0);//winmate Frank BL pwr off
gpio_direction_output(LVDS_BL_ON, 0);// winmate frank for panel pwr seq panel pwr off
gpio_set_value(BL_PWM, 0);
gpio_set_value(LVDS_PWR_ON, 0);
gpio_set_value(LVDS_BL_ON, 0);
setup_display();
gpio_set_value(BL_PWM, 1);
gpio_set_value(LVDS_PWR_ON, 1);
gpio_set_value(LVDS_BL_ON, 1);
}
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As you can see, I tried to define FX_GPIO_INIT to change gpio to 100K PULL DOWN..
But when I set LVDS_PWR_ON to 0 and set it back to 1, it won't work.
I can not control it.
Is there any possibility that I have to set other register mode for NANDF_CS2 ?
Or what else can I do to solve this situation?
Thanks in Advanced!
