linux-kernel - RE: [PATCH v4 07/12] usb: chipidea: add a usb2 driver for ci13xxx

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Date:	Fri, 12 Sep 2014 00:05:55 +0000
From:	Peter Chen <Peter.Chen@...escale.com>
To:	Antoine Tenart <antoine.tenart@...e-electrons.com>
CC:	"sebastian.hesselbarth@...il.com" <sebastian.hesselbarth@...il.com>,
	"balbi@...com" <balbi@...com>,
	"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
	"alexandre.belloni@...e-electrons.com" 
	<alexandre.belloni@...e-electrons.com>,
	"thomas.petazzoni@...e-electrons.com" 
	<thomas.petazzoni@...e-electrons.com>,
	"zmxu@...vell.com" <zmxu@...vell.com>,
	"jszhang@...vell.com" <jszhang@...vell.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 07/12] usb: chipidea: add a usb2 driver for ci13xxx


 
> On Thu, Sep 11, 2014 at 09:07:10AM +0800, Peter Chen wrote:
> > On Wed, Sep 03, 2014 at 09:48:26AM +0200, Antoine Tenart wrote:
> > > +
> > > +static int ci_hdrc_usb2_dt_probe(struct device *dev,
> > > +				 struct ci_hdrc_platform_data *ci_pdata) {
> > > +	ci_pdata->phy = of_phy_get(dev->of_node, 0);
> > > +	if (IS_ERR(ci_pdata->phy)) {
> > > +		if (PTR_ERR(ci_pdata->phy) == -EPROBE_DEFER)
> > > +			return -EPROBE_DEFER;
> > > +
> > > +		/* PHY is optional */
> > > +		ci_pdata->phy = NULL;
> > > +	}
> > > +
> > > +	return 0;
> > > +}
> >
> > You may also need to consider usb_phy case.
> 
> Don't we try using the generic PHY framework for new drivers?
> 
> Since there is no need for supporting an usb_phy case I don't think we have to
> consider this case yet. And no doing so could encourage people to add PHY
> drivers to the common PHY framework.
> 

If the common PHY framework is the only right way in future, you don't
need to change it.

> > > +
> > > +	if (dev->of_node) {
> > > +		ret = ci_hdrc_usb2_dt_probe(dev, ci_pdata);
> > > +		if (ret)
> > > +			return ret;
> > > +	} else {
> > > +		ret = dma_set_mask_and_coherent(&pdev->dev,
> DMA_BIT_MASK(32));
> > > +		if (ret)
> > > +			return ret;
> > > +	}
> >
> > You may need to do clk_disable_unprepare for above error cases.
> 
> Sure, I'll fix that.
> 
> > > +
> > > +	ci_pdata->name = dev_name(&pdev->dev);
> > > +
> > > +	priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
> > > +					   pdev->num_resources, ci_pdata);
> > > +	if (IS_ERR(priv->ci_pdev)) {
> > > +		ret = PTR_ERR(priv->ci_pdev);
> > > +		if (ret != -EPROBE_DEFER)
> > > +			dev_err(dev,
> > > +				"failed to register ci_hdrc platform
> device: %d\n",
> > > +				ret);
> >
> > Why you don't want the error message for deferral probe?
> 
> A driver can return an EPROBE_DEFER error and still probe successfully later.
> This would be confusing to have this kind of error message in this case. And
> when a driver returns -EPROBE_DEFER, there is an error message already.
> 

OK, agree.

Peter
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