platform/chrome: cros_ec_typec: Stash port driver info

Stash port number and a pointer to the driver-specific struct in the
local typec port struct.

These can be useful to the port driver to figure out how to communicate
with the Chrome EC when an altmode-driver related callback is invoked
from the Type-C class code.
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20221228004648.793339-4-pmalani@chromium.org

drivers/platform/chrome/cros_ec_typec.c

@@ -45,6 +45,7 @@ struct cros_typec_altmode_node {
 /* Per port data. */
 struct cros_typec_port {
 	struct typec_port *port;
+	int port_num;
 	/* Initial capabilities for the port. */
 	struct typec_capability caps;
 	struct typec_partner *partner;
@@ -78,6 +79,8 @@ struct cros_typec_port {
 	struct usb_power_delivery *partner_pd;
 	struct usb_power_delivery_capabilities *partner_src_caps;
 	struct usb_power_delivery_capabilities *partner_sink_caps;
+
+	struct cros_typec_data *typec_data;
 };
 
 /* Platform-specific data for the Chrome OS EC Type C controller. */
@@ -408,6 +411,8 @@ static int cros_typec_init_ports(struct cros_typec_data *typec)
 			goto unregister_ports;
 		}
 
+		cros_port->port_num = port_num;
+		cros_port->typec_data = typec;
 		typec->ports[port_num] = cros_port;
 		cap = &cros_port->caps;