linux-kernel - Re: [PATCH 2/4] pwm: rockchip: Allow polarity invert on rk3288

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Date:	Wed, 20 Aug 2014 08:09:04 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Heiko Stuebner <heiko@...ech.de>,
	Caesar Wang <caesar.wang@...k-chips.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Eddie Cai <eddie.cai@...k-chips.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-pwm <linux-pwm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/4] pwm: rockchip: Allow polarity invert on rk3288

On Tue, Aug 19, 2014 at 09:05:20AM -0700, Doug Anderson wrote:
> On Tue, Aug 19, 2014 at 12:18 AM, Thierry Reding <thierry.reding@...il.com> wrote:
> > On Mon, Aug 18, 2014 at 10:09:07AM -0700, Doug Anderson wrote:
[...]
> >> @@ -74,10 +78,14 @@ static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip, bool enable)
> >>  {
> >>       struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
> >>       u32 enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_ENABLE |
> >> -                       PWM_CONTINUOUS | PWM_DUTY_POSITIVE |
> >> -                       PWM_INACTIVE_NEGATIVE;
> >> +                       PWM_CONTINUOUS;
> >>       u32 val;
> >>
> >> +     if (pc->polarity == PWM_POLARITY_INVERSED)
> >> +             enable_conf |= PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSITIVE;
> >> +     else
> >> +             enable_conf |= PWM_DUTY_POSITIVE | PWM_INACTIVE_NEGATIVE;
> >
> > I have a feeling you're going to answer the above question with: "Because
> > it's needed here". If so, my reply would be: "Then this function should
> > take a struct pwm_device instead of struct pwm_chip."
> 
> OK.  I've chosen to have it take a pwm_device AND a pwm_chip.  It is a
> little redundant because a pwm_device has a pointer to its pwm_chip,
> but it follows the lead of all of the callbacks in "struct pwm_ops".
> If you'd like me to spin it to take only a pwm_device I'm happy to.

No, that's fine.

Thierry

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