linux-kernel - Re: [PATCH v2 5/6] pwm: mediatek: add PWM_CLK_DIV

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Date:   Tue, 27 Jun 2017 10:50:15 +0800
From:   Zhi Mao <zhi.mao@...iatek.com>
To:     m18063 <Claudiu.Beznea@...rochip.com>
CC:     <john@...ozen.org>, Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-pwm@...r.kernel.org>, <zhenbao.liu@...iatek.com>,
        <devicetree@...r.kernel.org>, <srv_heupstream@...iatek.com>,
        <sean.wang@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <yt.shen@...iatek.com>,
        <yingjoe.chen@...iatek.com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 5/6] pwm: mediatek: add PWM_CLK_DIV_MAX

On Mon, 2017-06-26 at 11:43 +0300, m18063 wrote:
> 
> On 23.06.2017 08:08, Zhi Mao wrote:
> > Replace "7" with "PWM_CLK_DIV_MAX" in function:mtk_pwm_config()
> > to improve the code readablity.
> > 
> > Signed-off-by: Zhi Mao <zhi.mao@...iatek.com>
> > ---
> >  drivers/pwm/pwm-mediatek.c |    6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
> > index 554a042..e5f6425 100644
> > --- a/drivers/pwm/pwm-mediatek.c
> > +++ b/drivers/pwm/pwm-mediatek.c
> > @@ -30,6 +30,8 @@
> >  #define PWMDWIDTH		0x2c
> >  #define PWMTHRES		0x30
> >  
> > +#define PWM_CLK_DIV_MAX		7
> > +
> >  enum {
> >  	MTK_CLK_MAIN = 0,
> >  	MTK_CLK_TOP,
> > @@ -130,8 +132,10 @@ static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
> >  		clkdiv++;
> >  	}
> >  
> > -	if (clkdiv > 7)
> > +	if (clkdiv > PWM_CLK_DIV_MAX) {
> You forgot to:
> 		mtk_pwm_clk_disable(chip, pwm);
Hi Claudiu,

Thanks for your suggestion.
It's a problem, I will modify this in the next release.

Regards,
Zhi
> > +		dev_err(chip->dev, "period %d not supported\n", period_ns);
> >  		return -EINVAL;
> > +	}
> >  
> >  	mtk_pwm_writel(pc, pwm->hwpwm, PWMCON, BIT(15) | clkdiv);
> >  	mtk_pwm_writel(pc, pwm->hwpwm, PWMDWIDTH, period_ns / resolution);
> >