linux-kernel - Re: [PATCH v3 02/20] usb: ehci-orion: Add the optional PHY support

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Date:	Wed, 7 May 2014 11:40:06 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jason Cooper <jason@...edaemon.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 02/20] usb: ehci-orion: Add the optional PHY support

Dear Andrew Lunn,

On Tue, 6 May 2014 15:33:41 +0200, Andrew Lunn wrote:

> > +	priv->phy = devm_phy_get(&pdev->dev, "usb");
> > +	if (!IS_ERR(priv->phy)) {
> > +		err = phy_init(priv->phy);
> > +		if (err)
> > +			goto err2;
> > +
> > +		err = phy_power_on(priv->phy);
> > +		if (err)
> > +			goto err3;
> > +	}
> 
> Hi Gregory
> 
> What about EPROBE_DEFERRED?

In v4 (to be submitted soon), I've changed this to:

	priv->phy = devm_phy_optional_get(&pdev->dev, "usb");
	if (IS_ERR(priv->phy)) {
		err = PTR_ERR(priv->phy);
		goto err_phy_get;
	} else {
		err = phy_init(priv->phy);
		if (err)
			goto err_phy_init;

		err = phy_power_on(priv->phy);
		if (err)
			goto err_phy_power_on;
	}

Thanks to devm_phy_optional_get(), the fact of not having a PHY in the
DT is not considered an error. So on any error from
devm_phy_optional_get() (including -EPROBE_DEFER), we simply bail out.
Does this looks good?

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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