linux-kernel - [PATCH v2 1/1] mfd: syscon: return -ENOSYS if CONFIG_MFD

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Message-ID: <1382431585-26649-1-git-send-email-peter.chen@freescale.com>
Date:	Tue, 22 Oct 2013 16:46:25 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	<sameo@...ux.intel.com>, <lee.jones@...aro.org>
CC:	<b29396@...escale.com>, <shawn.guo@...aro.org>,
	<peter.chen@...escale.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v2 1/1] mfd: syscon: return -ENOSYS if CONFIG_MFD_SYSCON is not enabled

Some platforms may not define CONFIG_MFD_SYSCON (or haven't syscon),
it can fix build error for these platforms.

Signed-off-by: Peter Chen <peter.chen@...escale.com>

---

Changes for v2:
- Using #ifdef instead of IS_ENABLED
- Using ENOSYS instead of ENXIO as return val

 include/linux/mfd/syscon.h |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
index b473577..8789fa3 100644
--- a/include/linux/mfd/syscon.h
+++ b/include/linux/mfd/syscon.h
@@ -17,10 +17,35 @@
 
 struct device_node;
 
+#ifdef CONFIG_MFD_SYSCON
 extern struct regmap *syscon_node_to_regmap(struct device_node *np);
 extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
 extern struct regmap *syscon_regmap_lookup_by_pdevname(const char *s);
 extern struct regmap *syscon_regmap_lookup_by_phandle(
 					struct device_node *np,
 					const char *property);
+#else
+static inline struct regmap *syscon_node_to_regmap(struct device_node *np)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+static inline struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+static inline struct regmap *syscon_regmap_lookup_by_pdevname(const char *s)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+static inline struct regmap *syscon_regmap_lookup_by_phandle(
+					struct device_node *np,
+					const char *property)
+{
+	return ERR_PTR(-ENOSYS);
+}
+#endif
+
 #endif /* __LINUX_MFD_SYSCON_H__ */
-- 
1.7.1


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