linux-kernel - [PATCH] pwm: Fix compilation error when CONFIG

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Message-Id: <1347343464-15417-1-git-send-email-tushar.behera@linaro.org>
Date:	Tue, 11 Sep 2012 11:34:24 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	thierry.reding@...onic-design.de, sachin.kamat@...aro.org,
	patches@...aro.org
Subject: [PATCH] pwm: Fix compilation error when CONFIG_PWM is not defined

As per Documentation/pwm.txt, PWM_LOOKUP and pwm_add_table are used in
board support files to add PWM chip entries. Currently these
definitions are protected within CONFIG_PWM macro in
include/linux/pwm.h.

Otherwise, we have to add ifdef's in machine file to fix following
compilation error.

error: array type has incomplete element type
error: implicit declaration of function ‘PWM_LOOKUP’ [-Werror=implicit-function-declaration]
error: implicit declaration of function ‘pwm_add_table’ [-Werror=implicit-function-declaration]
error: bit-field ‘<anonymous>’ width not an integer constant

Reported-by: Sachin Kamat <sachin.kamat@...aro.org>
Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
---
 include/linux/pwm.h |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 21d076c..87e7f45 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -124,6 +124,7 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
 
 struct pwm_device *pwm_get(struct device *dev, const char *consumer);
 void pwm_put(struct pwm_device *pwm);
+#endif
 
 struct pwm_lookup {
 	struct list_head list;
@@ -141,8 +142,10 @@ struct pwm_lookup {
 		.con_id = _con_id,			\
 	}
 
+#ifdef CONFIG_PWM
 void pwm_add_table(struct pwm_lookup *table, size_t num);
-
+#else
+static void pwm_add_table(struct pwm_lookup *table, size_t num) {}
 #endif
 
 #endif /* __LINUX_PWM_H */
-- 
1.7.4.1

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