linux-kernel - [RFC PATCH 2/2] of: add initcall with match boilerplate helpers

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Message-Id: <1383113571-13029-3-git-send-email-robherring2@gmail.com>
Date:	Wed, 30 Oct 2013 01:12:51 -0500
From:	Rob Herring <robherring2@...il.com>
To:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <rob.herring@...xeda.com>
Subject: [RFC PATCH 2/2] of: add initcall with match boilerplate helpers

From: Rob Herring <rob.herring@...xeda.com>

Add boilerplate helpers to create initcalls which are conditional on
matching on devicetree properties.

Cc: Grant Likely <grant.likely@...aro.org>
Signed-off-by: Rob Herring <rob.herring@...xeda.com>
---
 include/linux/of.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/of.h b/include/linux/of.h
index f95aee3..a1327c9 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -592,6 +592,18 @@ static inline int of_property_read_u32(const struct device_node *np,
 		s;						\
 		s = of_prop_next_string(prop, s))
 
+#define of_initcall_match(__func, __lvl, __match) \
+static int __init __func##_init(void) \
+{ \
+	if (of_find_matching_node(NULL, __match)) \
+		return __func(); \
+	else \
+		return -ENODEV;	\
+} \
+__lvl(__func##_init);
+
+#define of_module_init_match(__func, __match) of_initcall_match(__func, module_init, __match)
+
 #if defined(CONFIG_PROC_FS) && defined(CONFIG_PROC_DEVICETREE)
 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
-- 
1.8.1.2

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