linux-kernel - Re: [PATCH v2 4/7] usb: ehci-platform: add optional reset controller retrieval

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Message-ID: <20140512143052.GA17154@lukather>
Date:	Mon, 12 May 2014 16:30:52 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Emilio Lopez <emilio@...pez.com.ar>,
	Mike Turquette <mturquette@...aro.org>, kishon@...com,
	hdegoede@...hat.com, Boris Brezillon <boris@...e-electrons.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-usb@...r.kernel.org, kevin.z.m.zh@...il.com,
	sunny@...winnertech.com, shuge@...winnertech.com,
	zhuzhenhua@...winnertech.com, linux-sunxi@...glegroups.com,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>
Subject: Re: [PATCH v2 4/7] usb: ehci-platform: add optional reset controller
 retrieval

Hi Alan,

On Sat, May 10, 2014 at 10:35:49AM -0400, Alan Stern wrote:
> > @@ -206,6 +208,19 @@ static int ehci_platform_probe(struct platform_device *dev)
> >  				break;
> >  			}
> >  		}
> > +
> > +		priv->rst = devm_reset_control_get_optional(&dev->dev,
> > +							    NULL);
> 
> I hate the style that matches arguments on a continuation line with the
> opening paren of the function call, for a couple of reasons.  Instead I
> simply indent continuation lines by two or more tab stops.  But some
> people seem to be incurably attached to it.

Ok, I'll change it.

> > +		if (IS_ERR(priv->rst)) {
> > +			err = PTR_ERR(priv->rst);
> > +			if (err == -EPROBE_DEFER)
> > +				goto err_put_clks;
> > +			priv->rst = NULL;
> > +		} else {
> > +			err = reset_control_deassert(priv->rst);
> > +			if (err)
> > +				goto err_put_clks;
> > +		}
> >  	}
> >  
> >  	if (pdata->big_endian_desc)
> 
> The new code was added inside an "if" statement, which will cause it to
> apply only to OF devices.  Is there any reason not to put the new code
> outside the "if" statement, so it applies to all devices?

Hmmm, I did this because so far, the reset framework only handles the
DT case. But that's right that it can be extended in the future, I'll
update it.

Thanks!
Maxime

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

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