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usb: common: usb-conn-gpio: Make VBUS supply optional

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If the connector is the child of a USB port and that USB port already
has a VBUS supply attached to it, it would be redundant to require the
connector to have a VBUS supply. In this case, allow the VBUS supply to
be optional.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200806160248.3936771-1-thierry.reding@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thierry Reding 2020-08-06 18:02:47 +02:00 • committed by Greg Kroah-Hartman
parent 4d671957d4
commit 4ddf1ac79e
1 changed files with 24 additions and 6 deletions
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30
drivers/usb/common/usb-conn-gpio.c
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@ -91,14 +91,14 @@ static void usb_conn_detect_cable(struct work_struct *work)
return;
}
if (info->last_role == USB_ROLE_HOST)
if (info->last_role == USB_ROLE_HOST && info->vbus)
regulator_disable(info->vbus);
ret = usb_role_switch_set_role(info->role_sw, role);
if (ret)
dev_err(info->dev, "failed to set role: %d\n", ret);
if (role == USB_ROLE_HOST) {
if (role == USB_ROLE_HOST && info->vbus) {
ret = regulator_enable(info->vbus);
if (ret)
dev_err(info->dev, "enable vbus regulator failed\n");
@ -106,8 +106,9 @@ static void usb_conn_detect_cable(struct work_struct *work)
info->last_role = role;
dev_dbg(info->dev, "vbus regulator is %s\n",
regulator_is_enabled(info->vbus) ? "enabled" : "disabled");
if (info->vbus)
dev_dbg(info->dev, "vbus regulator is %s\n",
regulator_is_enabled(info->vbus) ? "enabled" : "disabled");
power_supply_changed(info->charger);
}
@ -156,6 +157,7 @@ static int usb_conn_probe(struct platform_device *pdev)
struct power_supply_config cfg = {
.of_node = dev->of_node,
};
bool need_vbus = true;
int ret = 0;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
@ -185,7 +187,23 @@ static int usb_conn_probe(struct platform_device *pdev)
INIT_DELAYED_WORK(&info->dw_det, usb_conn_detect_cable);
info->vbus = devm_regulator_get(dev, "vbus");
/*
* 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");
}
if (IS_ERR(info->vbus)) {
if (PTR_ERR(info->vbus) != -EPROBE_DEFER)
dev_err(dev, "failed to get vbus\n");
@ -266,7 +284,7 @@ static int usb_conn_remove(struct platform_device *pdev)
cancel_delayed_work_sync(&info->dw_det);
if (info->last_role == USB_ROLE_HOST)
if (info->last_role == USB_ROLE_HOST && info->vbus)
regulator_disable(info->vbus);
usb_role_switch_put(info->role_sw);