linux-kernel - Re: [PATCH v6 07/12] usb: chipidea: add a usb2 driver for ci13xxx

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Message-ID: <20140923133645.GA18924@kwain>
Date:	Tue, 23 Sep 2014 15:36:45 +0200
From:	Antoine Tenart <antoine.tenart@...e-electrons.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	sebastian.hesselbarth@...il.com, Peter.Chen@...escale.com,
	balbi@...com, p.zabel@...gutronix.de,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, alexandre.belloni@...e-electrons.com,
	jszhang@...vell.com
Subject: Re: [PATCH v6 07/12] usb: chipidea: add a usb2 driver for ci13xxx

Arnd,

On Tue, Sep 23, 2014 at 12:39:04PM +0200, Arnd Bergmann wrote:
> On Tuesday 23 September 2014 12:28:03 Antoine Tenart wrote:
> > +       if (dev->of_node) {
> > +               ret = ci_hdrc_usb2_dt_probe(dev, ci_pdata);
> > +               if (ret)
> > +                       goto clk_err;
> > +       } else {
> > +               ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> > +               if (ret)
> > +                       goto clk_err;
> > +       }
> > 
> 
> Why do you care about the non-DT case here? I think it would be nicer to
> open-code the ci_hdrc_usb2_dt_probe() function in here and remove
> the dma_set_mask_and_coherent(), which should not even be necessary for
> the case where you have a hardwired platform device.
> 

I thought we agreed to call dma_set_mask_and_coherent():
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/273335.html

I do not have a strong opinion on this as I only use the dt case for my
usage.


Antoine

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