phy: sun4i-usb: Add id_detect and vbus_detect ops

ID and VBUS detection code require when musb changing
between Host and/or Peripheral modes.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Jun Nie <jun.nie@linaro.org>

drivers/phy/allwinner/phy-sun4i-usb.c

@@ -14,6 +14,7 @@
 #include <dm.h>
 #include <dm/device.h>
 #include <generic-phy.h>
+#include <phy-sun4i-usb.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>
@@ -295,6 +296,44 @@ static int sun4i_usb_phy_xlate(struct phy *phy,
 	return 0;
 }
 
+int sun4i_usb_phy_vbus_detect(struct phy *phy)
+{
+	struct sun4i_usb_phy_data *data = dev_get_priv(phy->dev);
+	struct sun4i_usb_phy_plat *usb_phy = &data->usb_phy[phy->id];
+	int err, retries = 3;
+
+	debug("%s: id_det = %d\n", __func__, usb_phy->gpio_id_det);
+
+	if (usb_phy->gpio_vbus_det < 0)
+		return usb_phy->gpio_vbus_det;
+
+	err = gpio_get_value(usb_phy->gpio_vbus_det);
+	/*
+	 * Vbus may have been provided by the board and just been turned of
+	 * some milliseconds ago on reset, what we're measuring then is a
+	 * residual charge on Vbus, sleep a bit and try again.
+	 */
+	while (err > 0 && retries--) {
+		mdelay(100);
+		err = gpio_get_value(usb_phy->gpio_vbus_det);
+	}
+
+	return err;
+}
+
+int sun4i_usb_phy_id_detect(struct phy *phy)
+{
+	struct sun4i_usb_phy_data *data = dev_get_priv(phy->dev);
+	struct sun4i_usb_phy_plat *usb_phy = &data->usb_phy[phy->id];
+
+	debug("%s: id_det = %d\n", __func__, usb_phy->gpio_id_det);
+
+	if (usb_phy->gpio_id_det < 0)
+		return usb_phy->gpio_id_det;
+
+	return gpio_get_value(usb_phy->gpio_id_det);
+}
+
 static struct phy_ops sun4i_usb_phy_ops = {
 	.of_xlate = sun4i_usb_phy_xlate,
 	.init = sun4i_usb_phy_init,

include/phy-sun4i-usb.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2017 Jagan Teki <jagan@amarulasolutions.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __GENERIC_PHY_SUN4I_USB_H
+#define __GENERIC_PHY_SUN4I_USB_H
+
+/**
+ * sun4i_usb_phy_id_detect - detect ID pin of USB PHY
+ *
+ * @phy:	USB PHY port to detect ID pin
+ * @return 0 if OK, or a negative error code
+ */
+int sun4i_usb_phy_id_detect(struct phy *phy);
+
+/**
+ * sun4i_usb_phy_vbus_detect - detect VBUS pin of USB PHY
+ *
+ * @phy:	USB PHY port to detect VBUS pin
+ * @return 0 if OK, or a negative error code
+ */
+int sun4i_usb_phy_vbus_detect(struct phy *phy);
+
+#endif /*__GENERIC_PHY_SUN4I_USB_H */