Fall back to label if function is missing

The "label" property is obsolete and "function" should be used,
but devices like the Raspberry Pi 4b still use it.

Detect LEDs on such machines:

	-gpioleds0 at mainbus0: no LEDs
	+gpioleds0 at mainbus0: "led0", "led1"

OK patrick

1 files changed, 10 insertions, 5 deletions

diff --git a/sys/dev/fdt/gpioleds.c b/sys/dev/fdt/gpioleds.c
index 626c0846195..6a58344ac8b 100644
--- a/sys/dev/fdt/gpioleds.c
+++ b/sys/dev/fdt/gpioleds.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: gpioleds.c,v 1.2 2021/11/07 16:40:30 kn Exp $	*/
+/*	$OpenBSD: gpioleds.c,v 1.3 2021/11/07 16:43:12 kn Exp $	*/
 /*
  * Copyright (c) 2021 Klemens Nanni <kn@openbsd.org>
  *
@@ -60,15 +60,20 @@ gpioleds_attach(struct device *parent, struct device *self, void *aux)
 	struct fdt_attach_args	*faa = aux;
 	uint32_t		*led_pin;
 	char			*function, *default_state;
+	char			*function_prop = "function";
 	int			 function_len, default_state_len, gpios_len;
 	int			 node, leds = 0;
 
 	pinctrl_byname(faa->fa_node, "default");
 
 	for (node = OF_child(faa->fa_node); node; node = OF_peer(node)) {
-		function_len = OF_getproplen(node, "function");
-		if (function_len <= 0)
-			continue;
+		function_len = OF_getproplen(node, function_prop);
+		if (function_len <= 0) {
+			function_prop = "label";
+			function_len = OF_getproplen(node, function_prop);
+			if (function_len <= 0)
+				continue;
+		}
 		default_state_len = OF_getproplen(node, "default-state");
 		if (default_state_len <= 0)
 			continue;
@@ -77,7 +82,7 @@ gpioleds_attach(struct device *parent, struct device *self, void *aux)
 			continue;
 
 		function = malloc(function_len, M_TEMP, M_WAITOK);
-		OF_getprop(node, "function", function, function_len);
+		OF_getprop(node, function_prop, function, function_len);
 		default_state = malloc(default_state_len, M_TEMP, M_WAITOK);
 		OF_getprop(node, "default-state", default_state, default_state_len);
 		led_pin = malloc(gpios_len, M_TEMP, M_WAITOK);