linux-kernel - Re: [PATCH RESEND 2/5] pinctrl: berlin: add a pinctrl driver for Marvell Berlin SoCs

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Date:	Fri, 11 Apr 2014 10:18:39 +0200
From:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>
To:	Jisheng Zhang <jszhang@...vell.com>
Cc:	"sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	Jimmy Xu <zmxu@...vell.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND 2/5] pinctrl: berlin: add a pinctrl driver for
 Marvell Berlin SoCs

Hi Jisheng,

On Fri, Apr 11, 2014 at 02:44:31PM +0800, Jisheng Zhang wrote:
> On Thu, 10 Apr 2014 06:07:51 -0700
> Antoine Ténart <antoine.tenart@...e-electrons.com> wrote:
> 
> ...
> > +static int berlin_pinmux_enable(struct pinctrl_dev *pctrl_dev,
> > +                               unsigned function,
> > +                               unsigned group)
> > +{
> > +       struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev);
> > +       struct berlin_pinctrl_group *group_desc = pctrl->groups + group;
> > +       struct berlin_pinctrl_function *function_desc =
> > +               pctrl->functions + function;
> > +       unsigned long flags;
> > +       u32 regval;
> > +
> > +       spin_lock_irqsave(&pctrl->lock, flags);
> > +
> > +       regval = readl(group_desc->reg);
> > +       regval &= group_desc->mask;
> > +       regval |= function_desc->muxval << group_desc->lsb;
> > +       writel(regval, group_desc->reg);
> 
> Could we use relaxed version instead?

We could, but this is not a performance issue here at all, so I guess we can
keep writel().

Thanks for the feedback !

Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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