linux-kernel - Re: [PATCH 1/2] pwm: Add __weak attributed functions for pwm operations

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Date:	Sun, 15 May 2011 01:16:18 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Mohan Pallaka <mpallaka@...eaurora.org>,
	Russell King <rmk+kernel@....linux.org.uk>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.intradead.org, linux-input@...r.kernel.org,
	linux-i2c@...r.kernel.org, rmk@...-67.arm.linux.org.uk
Subject: Re: [PATCH 1/2] pwm: Add __weak attributed functions for pwm
 operations

On Fri, May 13, 2011 at 06:13:21PM +0530, Mohan Pallaka wrote:
> 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.
> 

Russell,

You seem to have authored pwm.h, do you have any objections to this
change?

Thanks!

> Change-Id: Ia507bf659d4d67d71f135012e7d919aca6c45c6c
> Signed-off-by: Mohan Pallaka <mpallaka@...eaurora.org>
> ---
>  include/linux/pwm.h |   12 +++++++-----
>  1 files changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/pwm.h b/include/linux/pwm.h
> index 7c77575..e0c8c3f 100644
> --- a/include/linux/pwm.h
> +++ b/include/linux/pwm.h
> @@ -3,29 +3,31 @@
>  
>  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);
>  
>  /*
>   * 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);
>  
>  /*
>   * pwm_enable - start a PWM output toggling
>   */
> -int pwm_enable(struct pwm_device *pwm);
> +int __weak pwm_enable(struct pwm_device *pwm);
>  
>  /*
>   * 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.

-- 
Dmitry
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