[PATCH v1 3/5] of: add generic of_fixup_machine_compatible()

[Oleksij Rempel <o.rempel@pengutronix.de>]

Add generic function to extend/fixup machine compatible.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 common/oftree.c | 30 ++++++++++++++++++++++++++++++
 include/of.h    |  6 ++++++
 2 files changed, 36 insertions(+)

diff --git a/common/oftree.c b/common/oftree.c
index c6d75055cc..0a66882946 100644
--- a/common/oftree.c
+++ b/common/oftree.c
@@ -487,3 +487,33 @@ int of_autoenable_i2c_by_component(char *path)
 
 	return ret;
 }
+
+int of_fixup_machine_compatible(struct device_node *root, const char *compat)
+{
+	int cclen = 0, clen = strlen(compat) + 1;
+	const char *curcompat;
+	void *buf;
+
+	if (!root) {
+		root = of_get_root_node();
+		if (!root)
+			return -ENODEV;
+	}
+
+	curcompat = of_get_property(root, "compatible", &cclen);
+
+	buf = xzalloc(cclen + clen);
+
+	memcpy(buf, compat, clen);
+	memcpy(buf + clen, curcompat, cclen);
+
+	/*
+	 * Prepend the compatible from board entry to the machine compatible.
+	 * Used to match bootspec entries against it.
+	 */
+	of_set_property(root, "compatible", buf, cclen + clen, true);
+
+	free(buf);
+
+	return 0;
+}
diff --git a/include/of.h b/include/of.h
index cf9950e9b3..9f514c5ec2 100644
--- a/include/of.h
+++ b/include/of.h
@@ -316,6 +316,7 @@ struct device_node *of_find_node_by_path_or_alias(struct device_node *root,
 		const char *str);
 int of_autoenable_device_by_path(char *path);
 int of_autoenable_i2c_by_component(char *path);
+int of_fixup_machine_compatible(struct device_node *root, const char *compat);
 #else
 static inline bool of_node_name_eq(const struct device_node *np, const char *name)
 {
@@ -834,6 +835,11 @@ static inline int of_autoenable_i2c_by_component(char *path)
 	return -ENODEV;
 }
 
+static int of_fixup_machine_compatible(struct device_node *root,
+				       const char *compat)
+{
+	return -ENODEV;
+}
 
 #endif
 
-- 
2.30.2


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