From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
linux-arm-kernel@lists.infradead.org,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
Andrew Lunn <andrew@lunn.ch>,
Russell King <linux@arm.linux.org.uk>,
Jason Cooper <jason@lakedaemon.net>,
Stephen Warren <swarren@wwwdotorg.org>,
devicetree-discuss@lists.ozlabs.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org,
Rob Herring <rob.herring@calxeda.com>,
Grant Likely <grant.likely@secretlab.ca>,
Lior Amsalem <alior@marvell.com>,
Ben Dooks <ben.dooks@codethink.co.uk>,
Rob Landley <rob@landley.net>,
Gregory CLEMENT <gregory.clement@free-electrons.com>
Subject: Re: [PATCH v4 03/10] pinctrl: mvebu: kirkwood pinctrl driver
Date: Thu, 20 Sep 2012 21:36:36 +0200 [thread overview]
Message-ID: <20120920213636.2ee27d41@skate> (raw)
In-Reply-To: <CACRpkdZYr2B83e3mBmMkO8Ai3xU_QGevfbSOSNoTvK3Lz6y6mg@mail.gmail.com>
Dear Linus Walleij,
On Thu, 20 Sep 2012 21:28:20 +0200, Linus Walleij wrote:
> So what I'm after is whether in this case statically encoding this
> onto the .dtsi files is the right thing to do, or whether the boot loader
> or kernel should runtime-modify the device tree, patching in
> the ASIC-specific info, just like device tree files can override
> properties from include files.
>
> Or if this is a bad idea.
>
> Nobody is doing that right now AFAICT, but it is surely possible....
If I understand correctly, we would like drivers to be able to read
some common "system" registers to figure out which SoC variant we are
running on. Such feature should normally be provided by code in
arch/arm/mach-*/ and called by drivers, but we are trying to eliminate
all dependencies of driver code on architecture code, correct?
So, wouldn't we need a small, architecture-independent, infrastructure,
through which architecture-specific code could "register" at boot
time which SoC we are running on, and drivers could query this
information from the common infrastructure?
Of course, the major problem is to figure out what is the good
representation for this SoC identifier. Do we need a big list of SoCs
like we had machine IDs? A simple string? Or maybe there is just no
good way, and the whole idea is moot.
Best regards,
Thomas
--
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
next prev parent reply other threads:[~2012-09-20 19:36 UTC|newest]
Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-11 12:56 [PATCH 00/11] pinctrl: mvebu: pinctrl driver Sebastian Hesselbarth
2012-08-11 12:56 ` [PATCH 01/11] pinctrl: mvebu: pinctrl driver core Sebastian Hesselbarth
2012-08-20 9:09 ` Linus Walleij
2012-08-20 9:46 ` Sebastian Hesselbarth
2012-08-20 12:51 ` Thomas Petazzoni
2012-08-20 14:18 ` Linus Walleij
2012-08-20 14:51 ` Sebastian Hesselbarth
2012-08-25 8:22 ` Andrew Lunn
2012-08-20 14:11 ` Linus Walleij
2012-08-11 12:56 ` [PATCH 02/11] pinctrl: mvebu: dove pinctrl driver Sebastian Hesselbarth
2012-08-20 13:43 ` Linus Walleij
2012-08-20 14:43 ` Sebastian Hesselbarh
2012-08-20 17:16 ` Thomas Petazzoni
2012-08-11 12:56 ` [PATCH 03/11] pinctrl: mvebu: kirkwood " Sebastian Hesselbarth
2012-08-20 13:49 ` Linus Walleij
2012-08-27 13:43 ` Ben Dooks
2012-08-27 19:19 ` Sebastian Hesselbarth
2012-08-27 20:02 ` Stephen Warren
2012-08-11 12:56 ` [PATCH 04/11] pinctrl: mvebu: add pinctrl driver for Armada 370 Sebastian Hesselbarth
2012-08-20 14:25 ` Linus Walleij
2012-08-20 16:48 ` Sebastian Hesselbarth
2012-08-20 17:36 ` Thomas Petazzoni
2012-08-20 18:01 ` Sebastian Hesselbarth
2012-08-20 18:51 ` Thomas Petazzoni
2012-08-21 7:12 ` Gregory CLEMENT
2012-08-11 12:56 ` [PATCH 05/11] pinctrl: mvebu: add pinctrl driver for Armada XP Sebastian Hesselbarth
2012-08-20 14:26 ` Linus Walleij
2012-08-11 12:56 ` [PATCH 06/11] ARM: mvebu: add pinctrl device in DT for Armada 370/XP SoCs Sebastian Hesselbarth
2012-08-20 14:27 ` Linus Walleij
2012-08-11 12:56 ` [PATCH 07/11] ARM: mvebu: Add pinctrl support to Armada XP SoCs Sebastian Hesselbarth
2012-08-20 14:27 ` Linus Walleij
2012-08-11 12:56 ` [PATCH 08/11] ARM: mvebu: Add pinctrl support to Armada 370 SoC Sebastian Hesselbarth
2012-08-20 14:28 ` Linus Walleij
2012-08-11 12:56 ` [PATCH 09/11] ARM: mvebu: adjust Armada XP evaluation board DTS Sebastian Hesselbarth
2012-08-20 14:28 ` Linus Walleij
2012-08-11 12:56 ` [PATCH 10/11] arm: mvebu: enable PINCTRL usage Sebastian Hesselbarth
2012-08-20 14:29 ` Linus Walleij
2012-08-11 12:56 ` [PATCH 11/11] arm: mvebu: add pinctrl support in defconfig Sebastian Hesselbarth
2012-08-20 14:31 ` Linus Walleij
2012-08-20 14:54 ` Sebastian Hesselbarth
2012-08-20 17:37 ` Thomas Petazzoni
2012-08-20 8:12 ` [PATCH 00/11] pinctrl: mvebu: pinctrl driver Linus Walleij
2012-08-22 8:22 ` [PATCH v2 0/9] " Sebastian Hesselbarth
2012-08-22 8:22 ` [PATCH v2 1/9] pinctrl: mvebu: pinctrl driver core Sebastian Hesselbarth
2012-08-22 20:43 ` Stephen Warren
2012-08-23 9:45 ` Sebastian Hesselbarth
2012-08-23 17:54 ` Stephen Warren
2012-08-23 20:31 ` Sebastian Hesselbarth
2012-08-23 21:26 ` Stephen Warren
2012-08-23 23:01 ` Sebastian Hesselbarth
2012-08-24 3:34 ` Stephen Warren
2012-08-25 15:53 ` Sebastian Hesselbarth
2012-08-27 4:33 ` Stephen Warren
2012-09-02 7:30 ` Linus Walleij
2012-09-02 8:27 ` Sebastian Hesselbarth
2012-09-03 9:32 ` Linus Walleij
2012-09-03 19:47 ` Jason Cooper
2012-09-09 19:56 ` Jason Cooper
2012-08-22 8:22 ` [PATCH v2 2/9] pinctrl: mvebu: dove pinctrl driver Sebastian Hesselbarth
2012-08-22 8:22 ` [PATCH v2 3/9] pinctrl: mvebu: kirkwood " Sebastian Hesselbarth
2012-08-22 8:22 ` [PATCH v2 4/9] pinctrl: mvebu: add pinctrl driver for Armada 370 Sebastian Hesselbarth
2012-08-22 8:22 ` [PATCH v2 5/9] pinctrl: mvebu: add pinctrl driver for Armada XP Sebastian Hesselbarth
2012-08-22 8:22 ` [PATCH v2 6/9] ARM: mvebu: add pinctrl device in DT for Armada 370/XP SoCs Sebastian Hesselbarth
2012-08-22 8:22 ` [PATCH v2 7/9] ARM: mvebu: Add pinctrl support to Armada XP SoCs Sebastian Hesselbarth
2012-08-22 20:45 ` Stephen Warren
2012-08-22 8:22 ` [PATCH v2 8/9] ARM: mvebu: Add pinctrl support to Armada 370 SoC Sebastian Hesselbarth
2012-08-22 20:46 ` Stephen Warren
2012-08-22 8:22 ` [PATCH v2 9/9] ARM: mvebu: adjust Armada XP evaluation board DTS Sebastian Hesselbarth
2012-09-10 8:39 ` [PATCH v3 0/9] pinctrl: mvebu: pinctrl driver Sebastian Hesselbarth
2012-09-10 8:39 ` [PATCH v3 1/9] pinctrl: mvebu: pinctrl driver core Sebastian Hesselbarth
2012-09-10 15:39 ` Linus Walleij
2012-09-11 14:44 ` Thomas Petazzoni
2012-09-11 22:17 ` Stephen Warren
2012-09-12 6:04 ` Linus Walleij
2012-09-12 6:54 ` Thomas Petazzoni
2012-09-12 15:50 ` Linus Walleij
2012-09-12 16:01 ` Thomas Petazzoni
2012-09-12 16:17 ` Linus Walleij
2012-09-12 21:10 ` Stephen Warren
2012-09-10 8:39 ` [PATCH v3 2/9] pinctrl: mvebu: dove pinctrl driver Sebastian Hesselbarth
2012-09-10 15:40 ` Linus Walleij
2012-09-11 22:18 ` Stephen Warren
2012-09-10 8:39 ` [PATCH v3 3/9] pinctrl: mvebu: kirkwood " Sebastian Hesselbarth
2012-09-10 15:42 ` Linus Walleij
2012-09-10 8:39 ` [PATCH v3 4/9] pinctrl: mvebu: add pinctrl driver for Armada 370 Sebastian Hesselbarth
2012-09-10 15:43 ` Linus Walleij
2012-09-10 8:39 ` [PATCH v3 5/9] pinctrl: mvebu: add pinctrl driver for Armada XP Sebastian Hesselbarth
2012-09-10 15:43 ` Linus Walleij
2012-09-10 8:39 ` [PATCH v3 6/9] ARM: mvebu: add pinctrl device in DT for Armada 370/XP SoCs Sebastian Hesselbarth
2012-09-11 22:23 ` Stephen Warren
2012-09-12 6:56 ` Thomas Petazzoni
2012-09-12 20:57 ` Stephen Warren
2012-09-10 8:39 ` [PATCH v3 7/9] ARM: mvebu: Add pinctrl support to Armada XP SoCs Sebastian Hesselbarth
2012-09-10 8:39 ` [PATCH v3 8/9] ARM: mvebu: Add pinctrl support to Armada 370 SoC Sebastian Hesselbarth
2012-09-10 8:39 ` [PATCH v3 9/9] ARM: mvebu: adjust Armada XP evaluation board DTS Sebastian Hesselbarth
2012-09-10 15:45 ` [PATCH v3 0/9] pinctrl: mvebu: pinctrl driver Linus Walleij
2012-09-10 15:57 ` Sebastian Hesselbarth
2012-09-13 15:41 ` [PATCH v4 00/10] " Sebastian Hesselbarth
2012-09-13 15:41 ` [PATCH v4 01/10] pinctrl: mvebu: pinctrl driver core Sebastian Hesselbarth
2012-09-13 15:41 ` [PATCH v4 02/10] pinctrl: mvebu: dove pinctrl driver Sebastian Hesselbarth
2013-06-18 11:36 ` Russell King - ARM Linux
2013-06-18 12:01 ` Sebastian Hesselbarth
2013-06-18 15:02 ` Linus Walleij
2013-06-18 15:11 ` Russell King - ARM Linux
2013-06-18 15:23 ` Linus Walleij
2013-06-18 18:33 ` Mark Brown
2012-09-13 15:41 ` [PATCH v4 03/10] pinctrl: mvebu: kirkwood " Sebastian Hesselbarth
2012-09-16 7:46 ` Andrew Lunn
2012-09-16 9:09 ` Sebastian Hesselbarth
2012-09-17 8:45 ` Linus Walleij
2012-09-20 15:30 ` Arnd Bergmann
2012-09-20 18:34 ` Andrew Lunn
2012-09-20 19:28 ` Linus Walleij
2012-09-20 19:36 ` Thomas Petazzoni [this message]
2012-09-20 19:51 ` Andrew Lunn
2012-09-21 10:56 ` Ben Dooks
2012-09-21 18:14 ` Linus Walleij
2012-09-16 12:40 ` Jason Cooper
2012-09-17 1:55 ` Nicolas Pitre
2012-09-17 6:36 ` Sebastian Hesselbarth
2012-09-17 8:32 ` Andrew Lunn
2012-09-18 18:59 ` Andrew Lunn
2012-09-13 15:41 ` [PATCH v4 04/10] pinctrl: mvebu: add pinctrl driver for Armada 370 Sebastian Hesselbarth
2012-09-13 15:41 ` [PATCH v4 05/10] pinctrl: mvebu: add pinctrl driver for Armada XP Sebastian Hesselbarth
2012-09-13 15:41 ` [PATCH v4 06/10] ARM: mvebu: Add pinctrl support to Armada XP SoCs Sebastian Hesselbarth
2012-09-13 15:41 ` [PATCH v4 07/10] ARM: mvebu: Add pinctrl support to Armada 370 SoC Sebastian Hesselbarth
2012-09-13 15:41 ` [PATCH v4 08/10] ARM: mvebu: adjust Armada XP evaluation board DTS Sebastian Hesselbarth
2012-09-13 15:41 ` [PATCH v4 09/10] arm: mvebu: split Kconfig options for Armada 370 and XP Sebastian Hesselbarth
2012-09-13 15:41 ` [PATCH v4 10/10] arm: mvebu: select the pinctrl drivers for Armada 370 and Armada XP platforms Sebastian Hesselbarth
2012-09-13 15:48 ` [PATCH v4 00/10] pinctrl: mvebu: pinctrl driver Thomas Petazzoni
2012-09-14 16:41 ` Stephen Warren
2012-09-20 8:13 ` [PATCH 00/11] " Linus Walleij
2012-09-20 8:17 ` Sebastian Hesselbarth
2012-09-20 9:04 ` Thomas Petazzoni
2012-09-20 10:02 ` Andrew Lunn
2012-09-20 10:32 ` Thomas Petazzoni
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