linux-kernel - Re: [PATCH 1/2] drivers: pwm: core: Add pwmchip_add

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Date:	Tue, 13 Jan 2015 12:44:13 -0800
From:	Scott Branden <sbranden@...adcom.com>
To:	Tim Kryger <tim.kryger@...il.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Arun Ramamurthy <arun.ramamurthy@...adcom.com>,
	Jonathan Richardson <jonathar@...adcom.com>
CC:	Ray Jui <rjui@...adcom.com>, Linux PWM <linux-pwm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH 1/2] drivers: pwm: core: Add pwmchip_add_inversed

Patchset looks good.

On 15-01-04 05:12 PM, Tim Kryger wrote:
> Add a new function to register a PWM chip with channels that have their
> initial polarity as inversed.  This benefits drivers of controllers that
> by default operate with inversed polarity by removing the need to modify
> the polarity during initialization.
>
> Signed-off-by: Tim Kryger <tim.kryger@...il.com>
Acked-by: Scott Branden <sbranden@...adcom.com>

> ---
>   drivers/pwm/core.c  | 36 ++++++++++++++++++++++++++++--------
>   include/linux/pwm.h |  6 ++++++
>   2 files changed, 34 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> index 966497d..f28c4ce 100644
> --- a/drivers/pwm/core.c
> +++ b/drivers/pwm/core.c
> @@ -222,14 +222,8 @@ void *pwm_get_chip_data(struct pwm_device *pwm)
>   }
>   EXPORT_SYMBOL_GPL(pwm_get_chip_data);
>
> -/**
> - * pwmchip_add() - register a new PWM chip
> - * @chip: the PWM chip to add
> - *
> - * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base
> - * will be used.
> - */
> -int pwmchip_add(struct pwm_chip *chip)
> +static int pwmchip_add_with_polarity(struct pwm_chip *chip,
> +				     enum pwm_polarity polarity)
>   {
>   	struct pwm_device *pwm;
>   	unsigned int i;
> @@ -259,6 +253,7 @@ int pwmchip_add(struct pwm_chip *chip)
>   		pwm->chip = chip;
>   		pwm->pwm = chip->base + i;
>   		pwm->hwpwm = i;
> +		pwm->polarity = polarity;
>
>   		radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
>   	}
> @@ -279,9 +274,34 @@ out:
>   	mutex_unlock(&pwm_lock);
>   	return ret;
>   }
> +
> +/**
> + * pwmchip_add() - register a new PWM chip
> + * @chip: the PWM chip to add
> + *
> + * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base
> + * will be used.  The initial polarity for all channels is normal.
> + */
> +int pwmchip_add(struct pwm_chip *chip)
> +{
> +	return pwmchip_add_with_polarity(chip, PWM_POLARITY_NORMAL);
> +}
>   EXPORT_SYMBOL_GPL(pwmchip_add);
>
>   /**
> + * pwmchip_add_inversed() - register a new PWM chip
> + * @chip: the PWM chip to add
> + *
> + * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base
> + * will be used.  The initial polarity for all channels is inversed.
> + */
> +int pwmchip_add_inversed(struct pwm_chip *chip)
> +{
> +	return pwmchip_add_with_polarity(chip, PWM_POLARITY_INVERSED);
> +}
> +EXPORT_SYMBOL_GPL(pwmchip_add_inversed);
> +
> +/**
>    * pwmchip_remove() - remove a PWM chip
>    * @chip: the PWM chip to remove
>    *
> diff --git a/include/linux/pwm.h b/include/linux/pwm.h
> index e90628c..358547f 100644
> --- a/include/linux/pwm.h
> +++ b/include/linux/pwm.h
> @@ -183,6 +183,7 @@ int pwm_set_chip_data(struct pwm_device *pwm, void *data);
>   void *pwm_get_chip_data(struct pwm_device *pwm);
>
>   int pwmchip_add(struct pwm_chip *chip);
> +int pwmchip_add_inversed(struct pwm_chip *chip);
>   int pwmchip_remove(struct pwm_chip *chip);
>   struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
>   					 unsigned int index,
> @@ -217,6 +218,11 @@ static inline int pwmchip_add(struct pwm_chip *chip)
>   	return -EINVAL;
>   }
>
> +static inline int pwmchip_add_inversed(struct pwm_chip *chip)
> +{
> +	return -EINVAL;
> +}
> +
>   static inline int pwmchip_remove(struct pwm_chip *chip)
>   {
>   	return -EINVAL;
>

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