It makes sense that if the USB connector is a child of an USB port
providing VBUS supply, there is no need to do it again.
But this does not handle the case where VBUS is controlled by PWR from
USB host controller, without any regulator at all.
Support this by making VBUS pure optional.
Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
---
This is essentially for getting rid of the warnings:
usb-conn-gpio 38100000.usb:connector: supply vbus not found, using dummy regulator
on our imx8mp based board. Only an ID pin GPIO is provided, VBUS is controlled
by USB PWR signal within USB core hardware.
drivers/usb/common/usb-conn-gpio.c | 20 +++-----------------
1 file changed, 3 insertions(+), 17 deletions(-)
diff --git a/drivers/usb/common/usb-conn-gpio.c b/drivers/usb/common/usb-conn-gpio.c
index 0158148cb054..395f9bbe3056 100644
--- a/drivers/usb/common/usb-conn-gpio.c
+++ b/drivers/usb/common/usb-conn-gpio.c
@@ -175,7 +175,6 @@ static int usb_conn_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct usb_conn_info *info;
- bool need_vbus = true;
int ret = 0;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
@@ -205,22 +204,9 @@ static int usb_conn_probe(struct platform_device *pdev)
INIT_DELAYED_WORK(&info->dw_det, usb_conn_detect_cable);
- /*
- * If the USB connector is a child of a USB port and that port already provides the VBUS
- * supply, there's no need for the USB connector to provide it again.
- */
- if (dev->parent && dev->parent->of_node) {
- if (of_find_property(dev->parent->of_node, "vbus-supply", NULL))
- need_vbus = false;
- }
-
- if (!need_vbus) {
- info->vbus = devm_regulator_get_optional(dev, "vbus");
- if (PTR_ERR(info->vbus) == -ENODEV)
- info->vbus = NULL;
- } else {
- info->vbus = devm_regulator_get(dev, "vbus");
- }
+ info->vbus = devm_regulator_get_optional(dev, "vbus");
+ if (PTR_ERR(info->vbus) == -ENODEV)
+ info->vbus = NULL;
if (IS_ERR(info->vbus)) {
ret = PTR_ERR(info->vbus);
--
2.25.1
