linux-kernel - Re: [PATCH v3 3/4] pwm: core: Export of_pwm_request() so client drivers can also use it

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Message-ID: <20121211070059.GA8294@avionic-0098.adnet.avionic-design.de>
Date:	Tue, 11 Dec 2012 08:00:59 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Bryan Wu <cooloney@...il.com>, Richard Purdie <rpurdie@...ys.net>,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-doc@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v3 3/4] pwm: core: Export of_pwm_request() so client
 drivers can also use it

On Mon, Dec 10, 2012 at 11:00:36AM +0100, Peter Ujfalusi wrote:
> Allow client driver to use of_pwm_request() to get the pwm they need. This
> is needed for drivers which handle more than one pwm separately, like
> leds-pwm driver which have:

Hi Peter,

I really was hoping that we didn't have to export this function, but I
can't think of any other way to solve the problem at hand either. I'd
prefer to rename the function to of_pwm_get() at the same time to keep
consistent with other subsystems that provide similar functionality.
Also, please use all-caps for PWM in prose. And while at it, you can
drop the "core:" and "so client drivers can also use it" from the
subject line.

> pwmleds {
> 	compatible = "pwm-leds";
> 	kpad {
> 		label = "omap4::keypad";
> 		pwms = <&twl_pwm 0 7812500>;
> 		max-brightness = <127>;
> 	};
> 
> 	charging {
> 		label = "omap4:green:chrg";
> 		pwms = <&twl_pwmled 0 7812500>;
> 		max-brightness = <255>;
> 	};
> };
> 
> in the dts files.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
>  drivers/pwm/core.c  | 2 +-
>  include/linux/pwm.h | 7 +++++++
>  2 files changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> index 903138b..3a7ebcc 100644
> --- a/drivers/pwm/core.c
> +++ b/drivers/pwm/core.c
> @@ -486,7 +486,7 @@ static struct pwm_chip *of_node_to_pwmchip(struct device_node *np)
>   * becomes mandatory for devices that look up the PWM device via the con_id
>   * parameter.
>   */
> -static struct pwm_device *of_pwm_request(struct device_node *np,
> +struct pwm_device *of_pwm_request(struct device_node *np,
>  					 const char *con_id)
>  {
>  	struct pwm_device *pwm = NULL;

This is missing an EXPORT_SYMBOL_GPL.

> diff --git a/include/linux/pwm.h b/include/linux/pwm.h
> index 6d661f3..d70ffe3 100644
> --- a/include/linux/pwm.h
> +++ b/include/linux/pwm.h
> @@ -175,6 +175,7 @@ struct pwm_device *of_pwm_xlate_with_flags(struct pwm_chip *pc,
>  		const struct of_phandle_args *args);
>  
>  struct pwm_device *pwm_get(struct device *dev, const char *consumer);
> +struct pwm_device *of_pwm_request(struct device_node *np, const char *con_id);

While at it, maybe rename the con_id parameter as well to match
pwm_get().

Thierry

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