linux-kernel - Re: [PATCH RFC] usb: gadget: Add xilinx axi usb2 device support

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Message-ID: <20140221161312.GA28555@e106331-lin.cambridge.arm.com>
Date:	Fri, 21 Feb 2014 16:13:12 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Felipe Balbi <balbi@...com>
Cc:	Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"michals@...inx.com" <michals@...inx.com>,
	Subbaraya Sundeep Bhatta <sbhatta@...inx.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH RFC] usb: gadget: Add xilinx axi usb2 device support

On Fri, Feb 21, 2014 at 03:41:03PM +0000, Felipe Balbi wrote:
> Hi,
> 
> On Fri, Feb 21, 2014 at 12:04:54PM +0000, Mark Rutland wrote:
> > > > +Example:
> > > > + 		axi-usb2-device@...00000 {
> > > > +                        compatible = "xlnx,axi-usb2-device-4.00.a";
> > > > +                        interrupt-parent = <0x1>;
> > > > +                        interrupts = <0x0 0x39 0x1>;
> > > > +                        reg = <0x42e00000 0x10000>;
> > > > +                        xlnx,include-dma = <0x1>;
> > > > +                };
> > > > +
> > > 
> > > you need to Cc devicetree@...r.kernel.org for this.
> > 
> > Cheers Filipe; thanks for adding us to Cc :)
> 
> sure, but it's "Felipe" ;-)

Whoops; sorry Felipe :)

> 
> > > > +	/* Map the registers */
> > > > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > > +	udc->base_address = devm_ioremap_nocache(&pdev->dev, res->start,
> > > > +						 resource_size(res));
> > > 
> > > use devm_ioremap_resource() instead.
> > 
> > Also, res might be NULL. You should check that before dereferencing it.
> 
> not needed when using devm_ioremap_resource(), see the implementation.

Ah, good to know.

Cheers,
Mark.
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