tegra: Allow boards to perform early GPIO setup

The new gpio_early_init() function, which does nothing by default, can
be overridden by boards to configure GPIOs at an early stage.
Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>
Acked-by: NStephen Warren <swarren@wwwdotorg.org>
Signed-off-by: NTom Warren <twarren@nvidia.com>

board/nvidia/common/board.c

@@ -132,11 +132,18 @@ int board_init(void)
 }
 
 #ifdef CONFIG_BOARD_EARLY_INIT_F
+static void __gpio_early_init(void)
+{
+}
+
+void gpio_early_init(void) __attribute__((weak, alias("__gpio_early_init")));
+
 int board_early_init_f(void)
 {
 	board_init_uart_f();
 
 	/* Initialize periph GPIOs */
+	gpio_early_init();
 #ifdef CONFIG_SPI_UART_SWITCH
 	gpio_early_init_uart();
 #else

board/nvidia/common/board.h

@@ -25,6 +25,7 @@
 #define _BOARD_H_
 
 void gpio_config_uart(void);
+void gpio_early_init(void);
 void gpio_early_init_uart(void);
 
 /*