linux-kernel - Re: [PATCH 04/14] pwm: rockchip: Add support for hardware readout

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Message-ID: <20160607172619.GB130037@google.com>
Date:	Tue, 7 Jun 2016 10:26:19 -0700
From:	Brian Norris <briannorris@...omium.org>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	linux-pwm@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org,
	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>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Milo Kim <milo.kim@...com>,
	Doug Anderson <dianders@...gle.com>,
	Caesar Wang <wxt@...k-chips.com>,
	Stephen Barber <smbarber@...omium.org>,
	Ajit Pal Singh <ajitpal.singh@...com>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
	Maxime Coquelin <maxime.coquelin@...com>,
	Patrice Chotard <patrice.chotard@...com>, kernel@...inux.com
Subject: Re: [PATCH 04/14] pwm: rockchip: Add support for hardware readout

On Sat, Jun 04, 2016 at 08:24:26AM +0200, Boris Brezillon wrote:
> On Fri, 3 Jun 2016 13:20:06 -0700 Brian Norris <briannorris@...omium.org> wrote:
> > On Fri, Jun 03, 2016 at 10:23:02AM +0200, Boris Brezillon wrote:
> > > @@ -75,6 +77,19 @@ static void rockchip_pwm_set_enable_v1(struct pwm_chip *chip,
> > >  	writel_relaxed(val, pc->base + pc->data->regs.ctrl);
> > >  }
> > >  
> > > +static void rockchip_pwm_get_state_v1(struct pwm_chip *chip,
> > > +				      struct pwm_device *pwm,
> > > +				      struct pwm_state *state)
> > > +{
> > > +	struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
> > > +	u32 enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN;
> > > +	u32 val;
> > > +
> > > +	val = readl(pc->base + pc->data->regs.ctrl);  
> > 
> > Nit: I just noticed you've been starting to use readl()/writel() in this
> > series, where previously {readl,writel}_relaxed() were being used. Any
> > reason?
> 
> Because I'm lazy and usually don't take the time to think whether it's
> safe of not to use the _relaxed() versions :-). Not sure you'll have a
> noticeable improvement by using _relaxed() for a PWM device by the
> way, but I can change that ;-).

I just figured consistency would be nice.

Brian