linux-kernel - Re: [PATCH 2/5] pwm: rockchip: Remove the judge from return value of rockchip_pwm

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Date:   Mon, 3 Jul 2017 20:31:57 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     David Wu <david.wu@...k-chips.com>
Cc:     thierry.reding@...il.com, heiko@...ech.de, robh+dt@...nel.org,
        catalin.marinas@....com, briannorris@...omium.org,
        dianders@...omium.org, mark.rutland@....com,
        huangtao@...k-chips.com, linux-pwm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] pwm: rockchip: Remove the judge from return value
 of rockchip_pwm_config()

On Thu, 29 Jun 2017 20:27:48 +0800
David Wu <david.wu@...k-chips.com> wrote:

> It seems the rockchip_pwm_config always returns the result 0,
> so remove the judge.
> 
> Signed-off-by: David Wu <david.wu@...k-chips.com>

Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> ---
>  drivers/pwm/pwm-rockchip.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c
> index 617824c..cd45f17 100644
> --- a/drivers/pwm/pwm-rockchip.c
> +++ b/drivers/pwm/pwm-rockchip.c
> @@ -165,7 +165,7 @@ static void rockchip_pwm_get_state(struct pwm_chip *chip,
>  	clk_disable(pc->pclk);
>  }
>  
> -static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
> +static void rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
>  			       int duty_ns, int period_ns)
>  {
>  	struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
> @@ -188,8 +188,6 @@ static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
>  
>  	writel(period, pc->base + pc->data->regs.period);
>  	writel(duty, pc->base + pc->data->regs.duty);
> -
> -	return 0;
>  }
>  
>  static int rockchip_pwm_enable(struct pwm_chip *chip,
> @@ -236,13 +234,7 @@ static int rockchip_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
>  		enabled = false;
>  	}
>  
> -	ret = rockchip_pwm_config(chip, pwm, state->duty_cycle, state->period);
> -	if (ret) {
> -		if (enabled != curstate.enabled)
> -			rockchip_pwm_enable(chip, pwm, !enabled,
> -				      state->polarity);
> -		goto out;
> -	}
> +	rockchip_pwm_config(chip, pwm, state->duty_cycle, state->period);
>  
>  	if (state->enabled != enabled) {
>  		ret = rockchip_pwm_enable(chip, pwm, state->enabled,