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usb: dwc3-generic: support external vbus regulator

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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@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Caleb Connolly 2024-02-26 17:26:06 +00:00
parent ca84ba6385
commit de451d5d5b
No known key found for this signature in database
GPG Key ID: 7930459FB9303217
1 changed files with 21 additions and 3 deletions
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24
drivers/usb/dwc3/dwc3-generic.c
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@ -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_supply;
};
static int dwc3_generic_probe(struct udevice *dev,
@ -240,11 +242,24 @@ static int dwc3_generic_host_probe(struct udevice *dev)
if (rc)
return rc;
rc = device_get_supply_regulator(dev, "vbus-supply", &priv->vbus_supply);
if (rc)
debug("%s: No vbus regulator found: %d\n", dev->name, rc);
/* Only returns an error if regulator is valid and failed to enable due to a driver issue */
rc = regulator_set_enable_if_allowed(priv->vbus_supply, true);
if (rc)
return rc;
hccr = (struct xhci_hccr *)priv->gen_priv.base;
hcor = (struct xhci_hcor *)(priv->gen_priv.base +
HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
return xhci_register(dev, hccr, hcor);
rc = xhci_register(dev, hccr, hcor);
if (rc)
regulator_set_enable_if_allowed(priv->vbus_supply, false);
return rc;
}
static int dwc3_generic_host_remove(struct udevice *dev)
@ -252,9 +267,12 @@ static int dwc3_generic_host_remove(struct udevice *dev)
struct dwc3_generic_host_priv *priv = dev_get_priv(dev);
int rc;
rc = xhci_deregister(dev);
/* This function always returns 0 */
xhci_deregister(dev);
rc = regulator_set_enable_if_allowed(priv->vbus_supply, false);
if (rc)
return rc;
debug("%s: Failed to disable vbus regulator: %d\n", dev->name, rc);
return dwc3_generic_remove(dev, &priv->gen_priv);
}