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Date: Fri, 07 Sep 2007 09:41:29 -0700 From: David Brownell <david-b@...bell.net> To: khali@...ux-fr.org, dmitry.torokhov@...il.com Cc: linux-kernel@...r.kernel.org, gregkh@...e.de Subject: Re: Platform device id > If a device has a <name>.<instance> scheme this implies possibility of > having several instances of said device in a box. There are a few of > platform devices that can only have one instance Like USB peripheral controllers. Only one external "B" type connector is allowed. > - for example i8042 > keyboard controller (the -1 special handling came from me because > i80420 name was very confusing - there wasn't a dot separator in the > name back then). There were other devices with similar issues. > Drivers that allow multiple devices should not > attempt to use -1 for the very first instance - this should eliminate > potential for error and special handling that you are talking about. For that matter, a *driver* should never create its own device node(s) in the first place. Device creation belongs elsewhere, like as part of platform setup or, for busses with integral enumeration support like PCI or USB, bus glue. Linux is moving away from that legacy model. I realize that may be more easily said than done in some cases, like i8042 on non-PNP systems. - Dave - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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