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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: "Russell King - ARM Linux" <linux@arm.linux.org.uk>
Cc: Grant Likely <grant.likely@secretlab.ca>,
	Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>,
	Kevin Hilman <khilman@ti.com>,
	Segher Boessenkool <segher@kernel.crashing.org>,
	Arnd Bergmann <arnd@arndb.de>,
	devicetree-discuss@lists.ozlabs.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Jeremy Kerr <jeremy.kerr@canonical.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/2] drivers/amba: probe via device tree
Date: Sun, 22 May 2011 12:00:46 +0200	[thread overview]
Message-ID: <201105221200.46810.rjw@sisk.pl> (raw)
In-Reply-To: <20110521234725.GB17672@n2100.arm.linux.org.uk>

On Sunday, May 22, 2011, Russell King - ARM Linux wrote:
> On Sat, May 21, 2011 at 11:42:34AM -0600, Grant Likely wrote:
> > Russell, it seems to me that the primary behaviour that amba_bus has
> > over platform_bus is the clock management, and secondarily
> > verification of the type of device by the device id.  Am I correct, or
> > am I missing something?
> 
> It matches by vendor/device ID just like PCI does, and does the bus
> clock management and power management in a really nice way, which I
> doubt platform devices will ever do.

Then we should use the AMBA bus where possible.  Also, if there are
AMBA devices that currently pretend to be platform devices, they should be
converted back to AMBA.

> The way this discussion is going, I'm going to suggest that we also
> convert PCI stuff to being platform devices too.  I don't see the
> point of PCI existing for all the same reasons being given in this
> thread.

I agree.

Thanks,
Rafael

WARNING: multiple messages have this Message-ID (diff)
From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Kevin Hilman <khilman@ti.com>,
	Segher Boessenkool <segher@kernel.crashing.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Grant Likely <grant.likely@secretlab.ca>,
	Jeremy Kerr <jeremy.kerr@canonical.com>,
	devicetree-discuss@lists.ozlabs.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/2] drivers/amba: probe via device tree
Date: Sun, 22 May 2011 12:00:46 +0200	[thread overview]
Message-ID: <201105221200.46810.rjw@sisk.pl> (raw)
In-Reply-To: <20110521234725.GB17672@n2100.arm.linux.org.uk>

On Sunday, May 22, 2011, Russell King - ARM Linux wrote:
> On Sat, May 21, 2011 at 11:42:34AM -0600, Grant Likely wrote:
> > Russell, it seems to me that the primary behaviour that amba_bus has
> > over platform_bus is the clock management, and secondarily
> > verification of the type of device by the device id.  Am I correct, or
> > am I missing something?
> 
> It matches by vendor/device ID just like PCI does, and does the bus
> clock management and power management in a really nice way, which I
> doubt platform devices will ever do.

Then we should use the AMBA bus where possible.  Also, if there are
AMBA devices that currently pretend to be platform devices, they should be
converted back to AMBA.

> The way this discussion is going, I'm going to suggest that we also
> convert PCI stuff to being platform devices too.  I don't see the
> point of PCI existing for all the same reasons being given in this
> thread.

I agree.

Thanks,
Rafael

WARNING: multiple messages have this Message-ID (diff)
From: rjw@sisk.pl (Rafael J. Wysocki)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] drivers/amba: probe via device tree
Date: Sun, 22 May 2011 12:00:46 +0200	[thread overview]
Message-ID: <201105221200.46810.rjw@sisk.pl> (raw)
In-Reply-To: <20110521234725.GB17672@n2100.arm.linux.org.uk>

On Sunday, May 22, 2011, Russell King - ARM Linux wrote:
> On Sat, May 21, 2011 at 11:42:34AM -0600, Grant Likely wrote:
> > Russell, it seems to me that the primary behaviour that amba_bus has
> > over platform_bus is the clock management, and secondarily
> > verification of the type of device by the device id.  Am I correct, or
> > am I missing something?
> 
> It matches by vendor/device ID just like PCI does, and does the bus
> clock management and power management in a really nice way, which I
> doubt platform devices will ever do.

Then we should use the AMBA bus where possible.  Also, if there are
AMBA devices that currently pretend to be platform devices, they should be
converted back to AMBA.

> The way this discussion is going, I'm going to suggest that we also
> convert PCI stuff to being platform devices too.  I don't see the
> point of PCI existing for all the same reasons being given in this
> thread.

I agree.

Thanks,
Rafael

  reply	other threads:[~2011-05-22 10:00 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-19 18:28 [PATCH v2 0/2] amba bus device tree probing Rob Herring
2011-05-19 18:28 ` Rob Herring
     [not found] ` <1305829704-11774-1-git-send-email-robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-05-19 18:28   ` [PATCH 1/2] dt: check for devices already created fron DT scan Rob Herring
2011-05-19 18:28     ` Rob Herring
     [not found]     ` <1305829704-11774-2-git-send-email-robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-05-19 19:54       ` Grant Likely
2011-05-19 19:54         ` Grant Likely
2011-05-19 18:28   ` [PATCH 2/2] drivers/amba: probe via device tree Rob Herring
2011-05-19 18:28     ` Rob Herring
     [not found]     ` <1305829704-11774-3-git-send-email-robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-05-19 20:01       ` Grant Likely
2011-05-19 20:01         ` Grant Likely
     [not found]         ` <20110519200158.GW5109-e0URQFbLeQY2iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2011-05-19 23:30           ` Rob Herring
2011-05-19 23:30             ` Rob Herring
2011-05-19 23:39             ` Grant Likely
2011-05-19 23:39               ` Grant Likely
     [not found]               ` <20110519233958.GB18181-e0URQFbLeQY2iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2011-05-20 13:24                 ` Rob Herring
2011-05-20 13:24                   ` Rob Herring
     [not found]                   ` <4DD66B8A.5040404-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-05-20 14:21                     ` Arnd Bergmann
2011-05-20 14:21                       ` Arnd Bergmann
     [not found]                       ` <201105201621.03801.arnd-r2nGTMty4D4@public.gmane.org>
2011-05-20 15:17                         ` Rob Herring
2011-05-20 15:17                           ` Rob Herring
     [not found]                           ` <4DD68614.6090209-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-05-20 16:08                             ` Stephen Neuendorffer
2011-05-20 16:08                               ` Stephen Neuendorffer
2011-05-21 17:42                               ` Grant Likely
2011-05-21 17:42                                 ` Grant Likely
2011-05-21 23:47                                 ` Russell King - ARM Linux
2011-05-21 23:47                                   ` Russell King - ARM Linux
2011-05-21 23:47                                   ` Russell King - ARM Linux
2011-05-22 10:00                                   ` Rafael J. Wysocki [this message]
2011-05-22 10:00                                     ` Rafael J. Wysocki
2011-05-22 10:00                                     ` Rafael J. Wysocki
2011-05-22 15:46                                   ` Rob Herring
2011-05-22 15:46                                     ` Rob Herring
2011-05-22 15:46                                     ` Rob Herring
2011-05-23 15:23                                   ` Grant Likely
2011-05-23 15:23                                     ` Grant Likely
2011-05-22 10:03                                 ` Arnd Bergmann
2011-05-22 10:03                                   ` Arnd Bergmann
2011-05-22 10:03                                   ` Arnd Bergmann
2011-05-25  9:03                                   ` Linus Walleij
2011-05-25  9:03                                     ` Linus Walleij
2011-05-23  9:37                                 ` Kristoffer Glembo
2011-05-23  9:37                                   ` Kristoffer Glembo
2011-05-23  9:37                                   ` Kristoffer Glembo
2011-05-23  9:58                                   ` Russell King - ARM Linux
2011-05-23  9:58                                     ` Russell King - ARM Linux
2011-05-23 15:09                                     ` Grant Likely
2011-05-23 15:09                                       ` Grant Likely
2011-05-23 15:09                                       ` Grant Likely
2011-05-24 15:03                                       ` Rob Herring
2011-05-24 15:03                                         ` Rob Herring
2011-05-24 15:03                                         ` Rob Herring
2011-05-25  3:02                                         ` Shawn Guo
2011-05-25  3:02                                           ` Shawn Guo
2011-05-25  3:02                                           ` Shawn Guo
2011-05-25  9:07                                         ` Linus Walleij
2011-05-25  9:07                                           ` Linus Walleij
     [not found]                               ` <a42f0c27-2811-4b68-bedf-7dfaa7bff6ff-+Ck8Kgl/v0/6UOWq+LNw4LjjLBE8jN/0@public.gmane.org>
2011-05-21 23:35                                 ` Russell King - ARM Linux
2011-05-21 23:35                                   ` Russell King - ARM Linux
     [not found]                                   ` <20110521233558.GA17672-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2011-05-23 15:00                                     ` Stephen Neuendorffer
2011-05-23 15:00                                       ` Stephen Neuendorffer
     [not found]                                       ` <1007bcf2-7786-4f03-bff7-8d8af83939f1-+Ck8Kgl/v0+GljRhoabY2LjjLBE8jN/0@public.gmane.org>
2011-05-23 15:47                                         ` Russell King - ARM Linux
2011-05-23 15:47                                           ` Russell King - ARM Linux
2011-05-21  4:00                             ` Segher Boessenkool
2011-05-21  4:00                               ` Segher Boessenkool
     [not found]                               ` <80f20ac921a33e9f0bf3e249f539a8ef-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2011-05-21 14:55                                 ` Rob Herring
2011-05-21 14:55                                   ` Rob Herring
     [not found]                                   ` <4DD7D24D.2070604-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2011-05-21 15:18                                     ` Segher Boessenkool
2011-05-21 15:18                                       ` Segher Boessenkool
     [not found]                                       ` <ad5605c2a3d4b36f63f36f52afe89cfd-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2011-05-21 17:43                                         ` Grant Likely
2011-05-21 17:43                                           ` Grant Likely

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