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tegra: Implement gpio_early_init() on Tamonten

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The PI4 GPIO is used on Tamonten to reset carrier board peripherals.
Power sequencing hardware on the carrier pulls the reset low before
powering up the Tegra, and the CPU is supposed to signal readiness,
and therefore bring peripherals out of reset by pulling PI4 high.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Thierry Reding 2012-06-04 20:02:28 +00:00 committed by Albert ARIBAUD (U-Boot)
parent cb7a1cf36a
commit 22d58506f5
1 changed files with 8 additions and 0 deletions
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8
board/avionic-design/common/tamonten.c
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@ -49,6 +49,14 @@ void gpio_config_uart(void)
{ {
} }
#ifdef CONFIG_BOARD_EARLY_INIT_F
void gpio_early_init(void)
{
gpio_request(GPIO_PI4, NULL);
gpio_direction_output(GPIO_PI4, 1);
}
#endif
#ifdef CONFIG_TEGRA2_MMC #ifdef CONFIG_TEGRA2_MMC
/* /*
* Routine: pin_mux_mmc * Routine: pin_mux_mmc