sunxi: Add INITIAL_USB_SCAN_DELAY Kconfig option

Some boards have on board usb devices which need longer than the USB
spec's 1 second to connect from board powerup. Add a config option which
when non 0 adds an extra delay before the first usb bus scan.
Signed-off-by: NHans de Goede <hdegoede@redhat.com>
Acked-by: NIan Campbell <ijc@hellion.org.uk>

arch/arm/mach-sunxi/usb_phy.c

@@ -85,6 +85,8 @@ static struct sunxi_usb_phy {
 #endif
 };
 
+static int initial_usb_scan_delay = CONFIG_INITIAL_USB_SCAN_DELAY;
+
 static int get_vbus_gpio(int index)
 {
 	switch (index) {
@@ -269,6 +271,11 @@ void sunxi_usb_phy_power_on(int index)
 {
 	struct sunxi_usb_phy *phy = &sunxi_usb_phy[index];
 
+	if (initial_usb_scan_delay) {
+		mdelay(initial_usb_scan_delay);
+		initial_usb_scan_delay = 0;
+	}
+
 	phy->power_on_count++;
 	if (phy->power_on_count != 1)
 		return;

board/sunxi/Kconfig

@@ -312,6 +312,15 @@ config MMC_SUNXI_SLOT_EXTRA
 	slot or emmc on mmc1 - mmc3. Setting this to 1, 2 or 3 will enable
 	support for this.
 
+config INITIAL_USB_SCAN_DELAY
+	int "delay initial usb scan by x ms to allow builtin devices to init"
+	default 0
+	---help---
+	Some boards have on board usb devices which need longer than the
+	USB spec's 1 second to connect from board powerup. Set this config
+	option to a non 0 value to add an extra delay before the first usb
+	bus scan.
+
 config USB0_VBUS_PIN
 	string "Vbus enable pin for usb0 (otg)"
 	default ""