usb: typec: tcpci: add regulator support

JIRA: https://issues.redhat.com/browse/RHEL-116016
Conflicts:
* This avoids commit bdd0400 ("usb: typec: tcpm/tcpci: Convert to
  i2c's .probe_new()") that converts *probe in tcpci_i2c_driver

commit a592e06
Author: Michael Grzeschik <m.grzeschik@pengutronix.de>
Date: Fri, 4 Apr 2025 01:17:20 +0200

  The tcpci chip vbus pin is possibly driven by an regulator. This patch
  is adding support to enable an optional vdd regulator before probing.

  Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
  Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
  Link: https://lore.kernel.org/r/20250404-ml-topic-tcpci-v1-1-4442c7d0ee1e@pengutronix.de
  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Desnes Nunes <desnesn@redhat.com>

Author: Desnes Nunes

drivers/usb/typec/tcpm/tcpci.c

@@ -17,6 +17,7 @@
 #include <linux/usb/tcpci.h>
 #include <linux/usb/tcpm.h>
 #include <linux/usb/typec.h>
+#include <linux/regulator/consumer.h>
 
 #define	PD_RETRY_COUNT_DEFAULT			3
 #define	PD_RETRY_COUNT_3_0_OR_HIGHER		2
@@ -906,6 +907,10 @@ static int tcpci_probe(struct i2c_client *client,
 	int err;
 	u16 val = 0;
 
+	err = devm_regulator_get_enable_optional(&client->dev, "vdd");
+	if (err && err != -ENODEV)
+		return dev_err_probe(&client->dev, err, "Failed to get regulator\n");
+
 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;