[RFC PATCH 10/15] pwm: add the PWM initial state retrieval infra

[Thierry Reding]

On Wed, Jul 01, 2015 at 10:21:56AM +0200, Boris Brezillon wrote:
> Add a ->init_state() function to the pwm_ops struct to let PWM drivers
> initialize the PWM state attached to a PWM device.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
> ---
>  drivers/pwm/core.c  | 3 +++
>  include/linux/pwm.h | 2 ++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> index 3e830ce..30631f5 100644
> --- a/drivers/pwm/core.c
> +++ b/drivers/pwm/core.c
> @@ -264,6 +264,9 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip,
>  		pwm->hwpwm = i;
>  		pwm_set_default_polarity(pwm, polarity);
>  
> +		if (chip->ops->init_state)
> +			chip->ops->init_state(chip, pwm);
> +
>  		radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
>  	}
>  
> diff --git a/include/linux/pwm.h b/include/linux/pwm.h
> index 0f36a06..b47244a 100644
> --- a/include/linux/pwm.h
> +++ b/include/linux/pwm.h
> @@ -177,6 +177,8 @@ struct pwm_ops {
>  					  struct pwm_device *pwm);
>  	void			(*disable)(struct pwm_chip *chip,
>  					   struct pwm_device *pwm);
> +	void			(*init_state)(struct pwm_chip *chip,
> +					      struct pwm_device *pwm);

I think I'd call this reset_state. init has this connotation of setting
a set of default values. For reset it's clearer in my opinion that it's
resetting to the hardware state.

Thierry
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