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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.

    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 */
    --
    Sent by a consultant of the Qualcomm Innovation Center, Inc.
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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