linux-kernel - Re: [PATCH 1/1] pwm: Convert period and duty cycle to u64

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Date:   Wed, 16 Oct 2019 09:41:34 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Guru Das Srinagesh <gurus@...eaurora.org>
Cc:     linux-pwm@...r.kernel.org, kernel-team@...roid.com,
        Mark Salyzyn <salyzyn@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] pwm: Convert period and duty cycle to u64

On Tue, Oct 15, 2019 at 07:11:39PM -0700, Guru Das Srinagesh wrote:
> Because period and duty cycle are defined as ints with units of
> nanoseconds, the maximum time duration that can be set is limited to
> ~2.147 seconds. Change their definitions to u64 so that higher durations
> may be set.
> 
> Signed-off-by: Guru Das Srinagesh <gurus@...eaurora.org>
> ---
>  drivers/pwm/core.c  |  4 ++--
>  drivers/pwm/sysfs.c | 10 +++++-----
>  include/linux/pwm.h | 16 ++++++++--------
>  3 files changed, 15 insertions(+), 15 deletions(-)

Applied, thanks.

Thierry

> diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
> index 6ad51aa..dc79c03 100644
> --- a/drivers/pwm/core.c
> +++ b/drivers/pwm/core.c
> @@ -1163,8 +1163,8 @@ static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
>  		if (state.enabled)
>  			seq_puts(s, " enabled");
>  
> -		seq_printf(s, " period: %u ns", state.period);
> -		seq_printf(s, " duty: %u ns", state.duty_cycle);
> +		seq_printf(s, " period: %llu ns", state.period);
> +		seq_printf(s, " duty: %llu ns", state.duty_cycle);
>  		seq_printf(s, " polarity: %s",
>  			   state.polarity ? "inverse" : "normal");
>  
> diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c
> index 2389b86..3fb1610 100644
> --- a/drivers/pwm/sysfs.c
> +++ b/drivers/pwm/sysfs.c
> @@ -42,7 +42,7 @@ static ssize_t period_show(struct device *child,
>  
>  	pwm_get_state(pwm, &state);
>  
> -	return sprintf(buf, "%u\n", state.period);
> +	return sprintf(buf, "%llu\n", state.period);
>  }
>  
>  static ssize_t period_store(struct device *child,
> @@ -52,10 +52,10 @@ static ssize_t period_store(struct device *child,
>  	struct pwm_export *export = child_to_pwm_export(child);
>  	struct pwm_device *pwm = export->pwm;
>  	struct pwm_state state;
> -	unsigned int val;
> +	u64 val;
>  	int ret;
>  
> -	ret = kstrtouint(buf, 0, &val);
> +	ret = kstrtou64(buf, 0, &val);
>  	if (ret)
>  		return ret;
>  
> @@ -77,7 +77,7 @@ static ssize_t duty_cycle_show(struct device *child,
>  
>  	pwm_get_state(pwm, &state);
>  
> -	return sprintf(buf, "%u\n", state.duty_cycle);
> +	return sprintf(buf, "%llu\n", state.duty_cycle);
>  }
>  
>  static ssize_t duty_cycle_store(struct device *child,
> @@ -212,7 +212,7 @@ static ssize_t capture_show(struct device *child,
>  	if (ret)
>  		return ret;
>  
> -	return sprintf(buf, "%u %u\n", result.period, result.duty_cycle);
> +	return sprintf(buf, "%llu %llu\n", result.period, result.duty_cycle);
>  }
>  
>  static DEVICE_ATTR_RW(period);
> diff --git a/include/linux/pwm.h b/include/linux/pwm.h
> index b2c9c46..1efdd63 100644
> --- a/include/linux/pwm.h
> +++ b/include/linux/pwm.h
> @@ -39,7 +39,7 @@ enum pwm_polarity {
>   * current PWM hardware state.
>   */
>  struct pwm_args {
> -	unsigned int period;
> +	u64 period;
>  	enum pwm_polarity polarity;
>  };
>  
> @@ -56,8 +56,8 @@ enum {
>   * @enabled: PWM enabled status
>   */
>  struct pwm_state {
> -	unsigned int period;
> -	unsigned int duty_cycle;
> +	u64 period;
> +	u64 duty_cycle;
>  	enum pwm_polarity polarity;
>  	bool enabled;
>  };
> @@ -105,13 +105,13 @@ static inline bool pwm_is_enabled(const struct pwm_device *pwm)
>  	return state.enabled;
>  }
>  
> -static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
> +static inline void pwm_set_period(struct pwm_device *pwm, u64 period)
>  {
>  	if (pwm)
>  		pwm->state.period = period;
>  }
>  
> -static inline unsigned int pwm_get_period(const struct pwm_device *pwm)
> +static inline u64 pwm_get_period(const struct pwm_device *pwm)
>  {
>  	struct pwm_state state;
>  
> @@ -126,7 +126,7 @@ static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty)
>  		pwm->state.duty_cycle = duty;
>  }
>  
> -static inline unsigned int pwm_get_duty_cycle(const struct pwm_device *pwm)
> +static inline u64 pwm_get_duty_cycle(const struct pwm_device *pwm)
>  {
>  	struct pwm_state state;
>  
> @@ -308,8 +308,8 @@ struct pwm_chip {
>   * @duty_cycle: duty cycle of the PWM signal (in nanoseconds)
>   */
>  struct pwm_capture {
> -	unsigned int period;
> -	unsigned int duty_cycle;
> +	u64 period;
> +	u64 duty_cycle;
>  };
>  
>  #if IS_ENABLED(CONFIG_PWM)
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

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