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

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Message-ID: <20140507132150.GA23936@lunn.ch>
Date:	Wed, 7 May 2014 15:21:50 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Andrew Lunn <andrew@...n.ch>,
	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

On Wed, May 07, 2014 at 11:40:06AM +0200, Thomas Petazzoni wrote:
> 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?

Hi Thomas

That looks good.

To avoid the SATA phy problems we had last time, i would like to test
this on a few systems. Please could you let me know what branch v4 is
in when it is ready.

   Thanks
	Andrew
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