The `cros_ec_typec` driver currently doesn't directly consume a default
USB mode value. This commit adds the `default_usb_mode_set` function,
enabling the `usb_capability` sysfs attribute to be writable.
This functionality allows users to dynamically activate or deactivate
USB4 mode on a given port.

Signed-off-by: Andrei Kuchynski <akuchynski@chromium.org>
---
 drivers/platform/chrome/cros_ec_typec.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index c5a7f42ffb5a..3de6b819906e 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -44,6 +44,11 @@ static void cros_typec_role_switch_quirk(struct fwnode_handle *fwnode)
 #endif
 }
 
+static int cros_typec_default_usb_mode_set(struct typec_port *port, enum usb_mode mode)
+{
+	return 0;
+}
+
 static int cros_typec_enter_usb_mode(struct typec_port *tc_port, enum usb_mode mode)
 {
 	struct cros_typec_port *port = typec_get_drvdata(tc_port);
@@ -59,6 +64,7 @@ static int cros_typec_enter_usb_mode(struct typec_port *tc_port, enum usb_mode m
 }
 
 static const struct typec_operations cros_typec_usb_mode_ops = {
+	.default_usb_mode_set = cros_typec_default_usb_mode_set,
 	.enter_usb_mode = cros_typec_enter_usb_mode
 };
 
-- 
2.50.0.727.gbf7dc18ff4-goog