Re: Linux-3.14-rc2: Order of serial node compatibles in DTS files.

[Kevin Hao <haokexin@gmail.com>]

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On Wed, Feb 12, 2014 at 10:21:58AM +1000, Stephen N Chivers wrote:
> But, the Interrupt Controller (MPIC)
> goes AWOL and it is down hill from there.
> 
> The MPIC is specified in the DTS as:
> 
>         mpic: pic@40000 {
>                         interrupt-controller;
>                         #address-cells = <0>;
>                         #interrupt-cells = <2>;
>                         reg = <0x40000 0x40000>;
>                         compatible = "chrp,open-pic";
>                         device_type = "open-pic";
>                         big-endian;
>                 };
> 
> The board support file has the standard mechanism for allocating
> the PIC:
> 
>         struct mpic *mpic;
> 
>         mpic = mpic_alloc(NULL, 0, 0, 0, 256, " OpenPIC  ");
>         BUG_ON(mpic == NULL);
> 
>         mpic_init(mpic);
> 
> I checked for damage in applying the patch and it has applied
> correctly.

How about the following fix?

diff --git a/drivers/of/base.c b/drivers/of/base.c
index ff85450d5683..ca91984d3c4b 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -730,32 +730,40 @@ out:
 }
 EXPORT_SYMBOL(of_find_node_with_property);
 
+static int of_match_type_name(const struct device_node *node,
+				const struct of_device_id *m)
+{
+	int match = 1;
+
+	if (m->name[0])
+		match &= node->name && !strcmp(m->name, node->name);
+
+	if (m->type[0])
+		match &= node->type && !strcmp(m->type, node->type);
+
+	return match;
+}
+
 static
 const struct of_device_id *__of_match_node(const struct of_device_id *matches,
 					   const struct device_node *node)
 {
 	const char *cp;
 	int cplen, l;
+	const struct of_device_id *m;
+	int match;
 
 	if (!matches)
 		return NULL;
 
 	cp = __of_get_property(node, "compatible", &cplen);
 	do {
-		const struct of_device_id *m = matches;
+		m = matches;
 
 		/* Check against matches with current compatible string */
-		while (m->name[0] || m->type[0] || m->compatible[0]) {
-			int match = 1;
-			if (m->name[0])
-				match &= node->name
-					&& !strcmp(m->name, node->name);
-			if (m->type[0])
-				match &= node->type
-					&& !strcmp(m->type, node->type);
-			if (m->compatible[0])
-				match &= cp
-					&& !of_compat_cmp(m->compatible, cp,
+		while (m->compatible[0]) {
+			match = of_match_type_name(node, m);
+			match &= cp && !of_compat_cmp(m->compatible, cp,
 							strlen(m->compatible));
 			if (match)
 				return m;
@@ -770,6 +778,15 @@ const struct of_device_id *__of_match_node(const struct of_device_id *matches,
 		}
 	} while (cp && (cplen > 0));
 
+	/* Check against matches without compatible string */
+	m = matches;
+	while (!m->compatible[0] && (m->name[0] || m->type[0])) {
+		match = of_match_type_name(node, m);
+		if (match)
+			return m;
+		m++;
+	}
+
 	return NULL;
 }


Thanks,
Kevin
> 
> Stephen Chivers,
> CSC Australia Pty. Ltd.
> 
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@lists.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev

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