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Subject[PATCH 1/2] pwm: Add __weak attributed functions for pwm operations
Date
For chip drivers that support both pwm and non-pwm modes
would encounter compilation errors if the platform doesn't
have support for pwm though the chip is programmed to work
in non-pwm mode. Add __weak attributed pwm functions to avoid
compilation issues in these scenarios.

Change-Id: Ia507bf659d4d67d71f135012e7d919aca6c45c6c
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>
---
include/linux/pwm.h | 21 ++++++++++++++++-----
1 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 7c77575..3a8c3df 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -3,29 +3,40 @@

struct pwm_device;

+/* Add __weak functions to support PWM */
+
/*
* pwm_request - request a PWM device
*/
-struct pwm_device *pwm_request(int pwm_id, const char *label);
+struct pwm_device __weak *pwm_request(int pwm_id, const char *label)
+{
+ return NULL;
+}

/*
* pwm_free - free a PWM device
*/
-void pwm_free(struct pwm_device *pwm);
+void __weak pwm_free(struct pwm_device *pwm) { }

/*
* pwm_config - change a PWM device configuration
*/
-int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
+int __weak pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+ return -ENODEV;
+}

/*
* pwm_enable - start a PWM output toggling
*/
-int pwm_enable(struct pwm_device *pwm);
+int __weak pwm_enable(struct pwm_device *pwm)
+{
+ return -EINVAL;
+}

/*
* pwm_disable - stop a PWM output toggling
*/
-void pwm_disable(struct pwm_device *pwm);
+void __weak pwm_disable(struct pwm_device *pwm) { }

#endif /* __LINUX_PWM_H */
--
1.7.1.1


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