From: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>
To: Florian Fainelli <florian-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>
Cc: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
Sebastian Andrzej Siewior
<sebastian-E0PNVn5OA6ohrxcnuTQ+TQ@public.gmane.org>,
Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Tony Prisk <linux-ci5G2KO2hbZ+pU9mqzGVBQ@public.gmane.org>,
Greg KH
<gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
USB list <linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH v2 2/2] USB: doc: Binding document for ehci-platform driver
Date: Wed, 24 Oct 2012 14:04:12 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1210241358090.1282-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <2721213.h9kKFkpVW0@flexo>
On Wed, 24 Oct 2012, Florian Fainelli wrote:
> As long as no one enables both ehci-platform and ehci-ppc-of at the same time
> there is no problem. ehci-ppc-of should be removed in favor of ehci-platform
> and make sure that the specific quirk in ehci-ppc-of also gets ported, other
> that I see no issue using "usb-ehci" as the least detailed compatible property
> name.
Suppose a DT board file is created for a oontroller which ehci-platform
can't handle. Then by your proposal, the board file shouldn't have
"usb-ehci" in its compatible property.
Now later on, suppose ehci-platform is enhanced so that it can manage
that controller. It's too late to update the board file because the
information has already been written to various firmwares. The
enhanced ehci-platform would have to include a special entry to match
the controller.
Since this reasoning applies every time ehci-platform is updated, it
seems reasonable to use the same approach right from the beginning.
Alan Stern
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WARNING: multiple messages have this Message-ID (diff)
From: stern@rowland.harvard.edu (Alan Stern)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/2] USB: doc: Binding document for ehci-platform driver
Date: Wed, 24 Oct 2012 14:04:12 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.44L0.1210241358090.1282-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <2721213.h9kKFkpVW0@flexo>
On Wed, 24 Oct 2012, Florian Fainelli wrote:
> As long as no one enables both ehci-platform and ehci-ppc-of at the same time
> there is no problem. ehci-ppc-of should be removed in favor of ehci-platform
> and make sure that the specific quirk in ehci-ppc-of also gets ported, other
> that I see no issue using "usb-ehci" as the least detailed compatible property
> name.
Suppose a DT board file is created for a oontroller which ehci-platform
can't handle. Then by your proposal, the board file shouldn't have
"usb-ehci" in its compatible property.
Now later on, suppose ehci-platform is enhanced so that it can manage
that controller. It's too late to update the board file because the
information has already been written to various firmwares. The
enhanced ehci-platform would have to include a special entry to match
the controller.
Since this reasoning applies every time ehci-platform is updated, it
seems reasonable to use the same approach right from the beginning.
Alan Stern
next prev parent reply other threads:[~2012-10-24 18:04 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-20 22:10 [PATCH v2 0/2] Update ehci-platform driver to support devicetree Tony Prisk
2012-10-20 22:10 ` Tony Prisk
[not found] ` <1350771032-11527-1-git-send-email-linux-ci5G2KO2hbZ+pU9mqzGVBQ@public.gmane.org>
2012-10-20 22:10 ` [PATCH v2 1/2] USB: Update EHCI-platform driver to devicetree Tony Prisk
2012-10-20 22:10 ` Tony Prisk
[not found] ` <1350771032-11527-2-git-send-email-linux-ci5G2KO2hbZ+pU9mqzGVBQ@public.gmane.org>
2012-10-21 2:02 ` Alan Stern
2012-10-21 2:02 ` Alan Stern
2012-10-22 14:51 ` Alan Stern
2012-10-20 22:10 ` [PATCH v2 2/2] USB: doc: Binding document for ehci-platform driver Tony Prisk
2012-10-20 22:10 ` Tony Prisk
[not found] ` <1350771032-11527-3-git-send-email-linux-ci5G2KO2hbZ+pU9mqzGVBQ@public.gmane.org>
2012-10-21 17:34 ` Florian Fainelli
2012-10-21 17:34 ` Florian Fainelli
2012-10-22 16:07 ` Stephen Warren
2012-10-22 16:07 ` Stephen Warren
[not found] ` <50856F41.7000205-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-10-22 17:34 ` Alan Stern
2012-10-22 17:34 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210221324580.1724-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-22 17:48 ` Stephen Warren
2012-10-22 17:48 ` Stephen Warren
[not found] ` <508586ED.1010106-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-10-22 19:00 ` Alan Stern
2012-10-22 19:00 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210221443580.1724-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-22 22:10 ` Stephen Warren
2012-10-22 22:10 ` Stephen Warren
[not found] ` <5085C470.4040707-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-10-23 14:10 ` Alan Stern
2012-10-23 14:10 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210231004310.1635-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-23 16:15 ` Stephen Warren
2012-10-23 16:15 ` Stephen Warren
[not found] ` <5086C2B0.6070006-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-10-23 17:59 ` Alan Stern
2012-10-23 17:59 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210231340340.1635-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-23 18:47 ` Stephen Warren
2012-10-23 18:47 ` Stephen Warren
[not found] ` <5086E62D.8040407-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-10-23 19:33 ` Alan Stern
2012-10-23 19:33 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210231522230.1635-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-23 20:06 ` Rob Herring
2012-10-23 20:06 ` Rob Herring
[not found] ` <5086F8D6.5050605-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2012-10-24 14:57 ` Alan Stern
2012-10-24 14:57 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210241013310.1481-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-24 15:26 ` Sebastian Andrzej Siewior
2012-10-24 15:26 ` Sebastian Andrzej Siewior
[not found] ` <20121024152652.GG4368-E0PNVn5OA6ohrxcnuTQ+TQ@public.gmane.org>
2012-10-24 16:16 ` Stephen Warren
2012-10-24 16:16 ` Stephen Warren
[not found] ` <5088145F.1040504-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-10-24 16:36 ` Florian Fainelli
2012-10-24 16:36 ` Florian Fainelli
2012-10-24 16:38 ` Alan Stern
2012-10-24 16:38 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210241233040.1282-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-24 16:44 ` Florian Fainelli
2012-10-24 16:44 ` Florian Fainelli
2012-10-24 18:04 ` Alan Stern [this message]
2012-10-24 18:04 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210241358090.1282-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-24 18:18 ` Florian Fainelli
2012-10-24 18:18 ` Florian Fainelli
2012-10-24 16:45 ` Stephen Warren
2012-10-24 16:45 ` Stephen Warren
[not found] ` <50881B19.3080609-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-10-24 17:46 ` Alan Stern
2012-10-24 17:46 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210241329230.1282-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-24 18:09 ` Stephen Warren
2012-10-24 18:09 ` Stephen Warren
[not found] ` <50882EED.9020200-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-10-24 18:55 ` Mitch Bradley
2012-10-24 18:55 ` Mitch Bradley
[not found] ` <5088399F.2000102-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
2012-10-24 19:30 ` Alan Stern
2012-10-24 19:30 ` Alan Stern
2012-10-25 10:23 ` Sebastian Andrzej Siewior
2012-10-25 10:23 ` Sebastian Andrzej Siewior
[not found] ` <20121025102301.GA3469-E0PNVn5OA6ohrxcnuTQ+TQ@public.gmane.org>
2012-10-25 14:36 ` Alan Stern
2012-10-25 14:36 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210251035270.1278-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-26 8:02 ` Sebastian Andrzej Siewior
2012-10-26 8:02 ` Sebastian Andrzej Siewior
[not found] ` <20121026080254.GD3009-E0PNVn5OA6ohrxcnuTQ+TQ@public.gmane.org>
2012-10-26 14:54 ` Alan Stern
2012-10-26 14:54 ` Alan Stern
2012-10-25 15:53 ` Stephen Warren
2012-10-25 15:53 ` Stephen Warren
2012-10-24 19:41 ` Alan Stern
2012-10-24 19:41 ` Alan Stern
2012-10-24 16:44 ` Alan Stern
2012-10-24 16:44 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210241238570.1282-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-24 16:48 ` Stephen Warren
2012-10-24 16:48 ` Stephen Warren
2012-10-24 17:42 ` Rob Herring
2012-10-24 17:42 ` Rob Herring
[not found] ` <50882882.1090806-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2012-10-24 17:57 ` Alan Stern
2012-10-24 17:57 ` Alan Stern
2012-10-24 16:28 ` Stephen Warren
2012-10-24 16:28 ` Stephen Warren
[not found] ` <50881727.10601-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-10-24 16:54 ` Alan Stern
2012-10-24 16:54 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1210241249010.1282-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2012-10-24 17:37 ` Florian Fainelli
2012-10-24 17:37 ` Florian Fainelli
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