[PATCH v4 02/39] usb: dwc3-generic: support external vbus regulator

[Caleb Connolly]

Add support for a vbus-supply regulator specified in devicetree. This
provides generic support to avoid hardcoded GPIO configuration in board
init code.

Reviewed-by: Neil Armstrong <neil.armstrong at linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
---
This patch has no dependencies

Cc: Marek Vasut <marex at denx.de>
---
 drivers/usb/dwc3/dwc3-generic.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index 6fb2de8a5ace..48da621ba966 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -21,6 +21,7 @@
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <malloc.h>
+#include <power/regulator.h>
 #include <usb.h>
 #include "core.h"
 #include "gadget.h"
@@ -47,6 +48,7 @@ struct dwc3_generic_priv {
 struct dwc3_generic_host_priv {
 	struct xhci_ctrl xhci_ctrl;
 	struct dwc3_generic_priv gen_priv;
+	struct udevice *vbus_dev;
 };
 
 static int dwc3_generic_probe(struct udevice *dev,
@@ -240,6 +242,13 @@ static int dwc3_generic_host_probe(struct udevice *dev)
 	if (rc)
 		return rc;
 
+	rc = device_get_supply_regulator(dev, "vbus-supply", &priv->vbus_dev);
+	if (rc)
+		debug("%s: No vbus regulator found: %d\n", dev->name, rc);
+
+	if (priv->vbus_dev)
+		regulator_set_enable(priv->vbus_dev, true);
+
 	hccr = (struct xhci_hccr *)priv->gen_priv.base;
 	hcor = (struct xhci_hcor *)(priv->gen_priv.base +
 			HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
@@ -256,6 +265,9 @@ static int dwc3_generic_host_remove(struct udevice *dev)
 	if (rc)
 		return rc;
 
+	if (priv->vbus_dev)
+		regulator_set_enable(priv->vbus_dev, false);
+
 	return dwc3_generic_remove(dev, &priv->gen_priv);
 }
 

-- 
2.43.1