linux-kernel - Re: [PATCH 4/7] ECHI Platform: Merge ppc-of EHCI driver into the ehci-platform driver

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Date:	Fri, 21 Feb 2014 15:21:32 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Mark Rutland <mark.rutland@....com>,
	Alistair Popple <alistair@...ple.id.au>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tony Prisk <linux@...sktech.co.nz>
Subject: Re: [PATCH 4/7] ECHI Platform: Merge ppc-of EHCI driver into the ehci-platform driver

On Friday 21 February 2014 11:48:03 Mark Rutland wrote:
> > +
> > +       np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx");
> > +       if (np != NULL) {
> > +               /* claim we really affected by usb23 erratum */
> > +               if (!of_address_to_resource(np, 0, &res))
> > +                       ehci->ohci_hcctrl_reg =
> > +                               devm_ioremap(&pdev->dev,
> > +                                            res.start + OHCI_HCCTRL_OFFSET,
> > +                                            OHCI_HCCTRL_LEN);
> > +               else
> > +                       ehci_dbg(ehci, "%s: no ohci offset in fdt\n", __FILE__);
> > +               if (!ehci->ohci_hcctrl_reg) {
> > +                       ehci_dbg(ehci, "%s: ioremap for ohci hcctrl failed\n",
> > +                               __FILE__);
> > +               } else {
> > +                       ehci->has_amcc_usb23 = 1;
> > +               }
> > +       }
> 
> As this is being dropped into a generic driver, it would be nice to have
> a comment explaining why we need to do this -- not everyone using this
> will know the powerpc history. It certainly seems odd to look for
> another node in the tree that this driver isn't necessarily handling,
> and that should probably be explained.
> 
> As this bit of fixup is only needed for powerpc, it would be nice to not
> have to do it elsewhere. Perhaps these could be factored out into a
> ppc_platform_reset function that could be empty stub for other
> architectures.

How about using the .data field of the of_device_id array to point to
a structure of functions? That way you don't even have to call
of_device_is_compatible() here. Note that using of_find_compatible_node()
is the wrong approach anyway, you want to check the current device
for compatibility, not just any device I assume.

	Arnd
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