linux-kernel - Re: [PATCH v4 05/24] misc: max77693-haptic: use pwm_get

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Message-ID: <20151116170040.00110079@bbrezillon>
Date:	Mon, 16 Nov 2015 17:00:40 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Thierry Reding <thierry.reding@...il.com>,
	linux-pwm@...r.kernel.org,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Kamil Debski <k.debski@...sung.com>, lm-sensors@...sensors.org,
	Jean Delvare <jdelvare@...e.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
	Joachim Eastwood <manabian@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org,
	Jingoo Han <jingoohan1@...il.com>,
	Lee Jones <lee.jones@...aro.org>, linux-fbdev@...r.kernel.org,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	k.kozlowski.k@...il.com
Subject: Re: [PATCH v4 05/24] misc: max77693-haptic: use pwm_get_xxx()
 helpers where appropriate

On Mon, 16 Nov 2015 07:55:33 -0800
Guenter Roeck <linux@...ck-us.net> wrote:

> On 11/16/2015 05:55 AM, Boris Brezillon wrote:
> > Hi Krzysztof,
> >
> > On Mon, 16 Nov 2015 22:10:40 +0900
> > Krzysztof Kozlowski <k.kozlowski@...sung.com> wrote:
> >
> >> W dniu 16.11.2015 o 17:56, Boris Brezillon pisze:
> >>> Use pwm_get_xxx() helpers instead of directly accessing the pwm->xxx field.
> >>> Doing that will ease adaptation of the PWM framework to support atomic
> >>> update.
> >>>
> >>> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> >>> ---
> >>> Patch generated with the following coccinelle script:
> >>>
> >>> --->8---
> >>> virtual patch
> >>>
> >>> @@
> >>> struct pwm_device *p;
> >>> expression e;
> >>> @@
> >>> (
> >>> -(p)->polarity = e;
> >>> +pwm_set_polarity((p), e);
> >>> |
> >>> -(p)->polarity
> >>> +pwm_get_polarity((p))
> >>> |
> >>> -(p)->period = e;
> >>> +pwm_set_period((p), e);
> >>> |
> >>> -(p)->period
> >>> +pwm_get_period((p))
> >>> |
> >>> -(p)->duty_cycle = e;
> >>> +pwm_set_duty_cycle((p), e);
> >>> |
> >>> -(p)->duty_cycle
> >>> +pwm_get_duty_cycle((p))
> >>> )
> >>> --->8---
> >>> ---
> >>>   drivers/input/misc/max77693-haptic.c | 7 ++++---
> >>>   1 file changed, 4 insertions(+), 3 deletions(-)
> >>>
> >>> diff --git a/drivers/input/misc/max77693-haptic.c b/drivers/input/misc/max77693-haptic.c
> >>> index 6d96bff..a038fb3 100644
> >>> --- a/drivers/input/misc/max77693-haptic.c
> >>> +++ b/drivers/input/misc/max77693-haptic.c
> >>> @@ -70,10 +70,11 @@ struct max77693_haptic {
> >>>
> >>>   static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic)
> >>>   {
> >>> -	int delta = (haptic->pwm_dev->period + haptic->pwm_duty) / 2;
> >>> +	int delta = (pwm_get_period((haptic->pwm_dev)) + haptic->pwm_duty) / 2;
> >>
> >> Double parentheses over argument are not needed so just:
> >> pwm_get_period(haptic->pwm_dev) + ...
> >
> > Actually it was generated with coccinelle, hence I didn't fix existing
> > coding style issues, but I have no problem fixing them.
> >
> There was no existing coding style issue. Your coccinelle script introduces it.
> You might want to consider updating your script and remove the unnecessary (( ))
> from it.

My bad, you are right: my script is buggy. I'll fix that.

Thanks,

Boris


-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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