linux-kernel - Re: [PATCH v2 1/4] pwm: meson: Simplify get

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Message-ID: <ll3i664yuojtueo5c5uzclduylbrjxf3r672jjb5hgtbslx6jj@fvcefnjftqmq>
Date: Mon, 4 Nov 2024 10:08:02 +0100
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: George Stark <gnstark@...utedevices.com>
Cc: neil.armstrong@...aro.org, khilman@...libre.com, jbrunet@...libre.com, 
	martin.blumenstingl@...glemail.com, linux-pwm@...r.kernel.org, linux-amlogic@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, kernel@...utedevices.com
Subject: Re: [PATCH v2 1/4] pwm: meson: Simplify get_state() callback

On Wed, Oct 16, 2024 at 06:25:50PM +0300, George Stark wrote:
> In .get_state() callback meson_pwm_channel struct are used to store
> lo and hi reg values but they are never reused after that so
> for clearness use local variable instead.
> 
> Signed-off-by: George Stark <gnstark@...utedevices.com>
> ---
>  drivers/pwm/pwm-meson.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c
> index 98e6c1533312..2ef632caebcc 100644
> --- a/drivers/pwm/pwm-meson.c
> +++ b/drivers/pwm/pwm-meson.c
> @@ -310,6 +310,7 @@ static int meson_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
>  	struct meson_pwm *meson = to_meson_pwm(chip);
>  	struct meson_pwm_channel_data *channel_data;
>  	struct meson_pwm_channel *channel;
> +	unsigned int hi, lo;
>  	u32 value;
>  
>  	channel = &meson->channels[pwm->hwpwm];
> @@ -319,11 +320,11 @@ static int meson_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
>  	state->enabled = value & channel_data->pwm_en_mask;
>  
>  	value = readl(meson->base + channel_data->reg_offset);
> -	channel->lo = FIELD_GET(PWM_LOW_MASK, value);
> -	channel->hi = FIELD_GET(PWM_HIGH_MASK, value);
> +	lo = FIELD_GET(PWM_LOW_MASK, value);
> +	hi = FIELD_GET(PWM_HIGH_MASK, value);
>  
> -	state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->lo + channel->hi);
> -	state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm, channel->hi);
> +	state->period = meson_pwm_cnt_to_ns(chip, pwm, lo + hi);
> +	state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm, hi);
>  
>  	state->polarity = PWM_POLARITY_NORMAL;

Fine for me if you drop the local variable channel as found by the build
bot.

Best regards
Uwe

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