tegra: Implement gpio_early_init() on Tamonten

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>

diff --git a/board/avionic-design/common/tamonten.c b/board/avionic-design/common/tamonten.c
index d9ecd238d5605261a25b4beb330aae4d157d82c8..915247c760c69f14c523ac782221f3430c55f02f 100644 (file)
--- a/board/avionic-design/common/tamonten.c
+++ b/board/avionic-design/common/tamonten.c
@@ -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
 /*
  * Routine: pin_mux_mmc