board: roc-pc-rk3399: Add support for onboard LED's and push button to indicate power mode

Added support for onboard LED's and push button. When powered board will be
in low power mode(yellow LED), on button press, board enters full power mode
(red LED) and boots u-boot.

Signed-off-by: Suniel Mahesh <sunil@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/tpl.c

@@ -40,11 +40,18 @@ __weak void rockchip_stimer_init(void)
 	       TIMER_CONTROL_REG);
 }
 
+__weak int board_early_init_f(void)
+{
+	return 0;
+}
+
 void board_init_f(ulong dummy)
 {
 	struct udevice *dev;
 	int ret;
 
+	board_early_init_f();
+
 #if defined(CONFIG_DEBUG_UART) && defined(CONFIG_TPL_SERIAL_SUPPORT)
 	/*
 	 * Debug UART can be used from here if required:

board/firefly/roc-pc-rk3399/roc-pc-rk3399.c

@@ -7,6 +7,10 @@
 #include <dm.h>
 #include <asm/arch-rockchip/periph.h>
 #include <power/regulator.h>
+#include <spl_gpio.h>
+#include <asm/io.h>
+#include <asm/arch-rockchip/gpio.h>
+#include <asm/arch-rockchip/grf_rk3399.h>
 
 #ifndef CONFIG_SPL_BUILD
 int board_early_init_f(void)
@@ -27,3 +31,31 @@ out:
 	return 0;
 }
 #endif
+
+#if defined(CONFIG_TPL_BUILD)
+
+#define PMUGRF_BASE     0xff320000
+#define GPIO0_BASE      0xff720000
+
+int board_early_init_f(void)
+{
+	struct rockchip_gpio_regs * const gpio0 = (void *)GPIO0_BASE;
+	struct rk3399_pmugrf_regs * const pmugrf = (void *)PMUGRF_BASE;
+
+	/**
+	 * 1. Glow yellow LED, termed as low power
+	 * 2. Poll for on board power key press
+	 * 3. Once 2 done, off yellow and glow red LED, termed as full power
+	 * 4. Continue booting...
+	 */
+	spl_gpio_output(gpio0, GPIO(BANK_A, 2), 1);
+
+	spl_gpio_set_pull(&pmugrf->gpio0_p, GPIO(BANK_A, 5), GPIO_PULL_NORMAL);
+	while (readl(&gpio0->ext_port) & 0x20);
+
+	spl_gpio_output(gpio0, GPIO(BANK_A, 2), 0);
+	spl_gpio_output(gpio0, GPIO(BANK_B, 5), 1);
+
+	return 0;
+}
+#endif

configs/roc-pc-rk3399_defconfig

@@ -57,3 +57,4 @@ CONFIG_USB_ETHER_RTL8152=y
 CONFIG_USB_ETHER_SMSC95XX=y
 CONFIG_SPL_TINY_MEMSET=y
 CONFIG_ERRNO_STR=y
+CONFIG_TPL_GPIO_SUPPORT=y