fexc: add port:power support

script_bin.c

@@ -253,8 +253,10 @@ static int decompile_section(void *bin, size_t UNUSED(bin_size),
 			if (words != 6) {
 				pr_err("%s: %s.%s: invalid length %d (assuming %d)\n",
 				       filename, section->name, entry->name, words, 6);
+			} else if (gpio->port == 0xffff) {
+				; /* port:power */
 			} else if (gpio->port < 1 || gpio->port > 10) {
-				pr_err("%s: %s.%s: unknown GPIO port type %d\n",
+				pr_err("%s: %s.%s: unknown GPIO port type %u\n",
 				       filename, section->name, entry->name, gpio->port);
 				goto failure;
 			}

script_fex.c

@@ -125,8 +125,14 @@ int script_generate_fex(FILE *out, const char *UNUSED(filename),
 				struct script_gpio_entry *gpio;
 				gpio = container_of(entry, struct script_gpio_entry, entry);
 
+				if (gpio->port == 0xffff) {
+					fprintf(out, "%s = port:power%u", entry->name,
+						gpio->port_num);
+				} else {
 					port += gpio->port;
-				fprintf(out, "%s = port:P%c%02d", entry->name, port, gpio->port_num);
+					fprintf(out, "%s = port:P%c%02u", entry->name,
+						port, gpio->port_num);
+				}
 				for (const int *p = gpio->data, *pe = p+4; p != pe; p++) {
 					if (*p == -1)
 						fputs("<default>", out);