From: Shawn Guo <shawn.guo@linaro.org>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Stephen Warren <swarren@nvidia.com>,
"linus.walleij@stericsson.com" <linus.walleij@stericsson.com>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"rob.herring@calxeda.com" <rob.herring@calxeda.com>,
Richard Zhao <richard.zhao@linaro.org>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
"cjb@laptop.org" <cjb@laptop.org>,
"devicetree-discuss@lists.ozlabs.org"
<devicetree-discuss@lists.ozlabs.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Dong Aisheng <dongas86@gmail.com>
Subject: Re: [RFC PATCH v3 2/5] pinctrl: add dt binding support for pinmux mappings
Date: Tue, 17 Jan 2012 10:32:11 +0800 [thread overview]
Message-ID: <20120117023206.GA11756@S2101-09.ap.freescale.net> (raw)
In-Reply-To: <CACRpkdYmxQd7aaRhs+xc5nizC7OjwRzsduq-28kVTLjhTGjVZw@mail.gmail.com>
On Mon, Jan 16, 2012 at 05:08:57PM +0100, Linus Walleij wrote:
...
> As you can see none of the text above claims that the group is
> about hardware-defined groups or anything like that. The groups
> are just that - a group of pins, an abstract concept of a group.
Ok, the thing gets clarified. The concept of group is a abstract at
software level. It does not necessarily require a pin group defined
by raw hardware underneath, which is basically my argument.
> It could be drawn i UML even... maybe I'll do that for my
> ELC presentation :-)
>
> Then when we come to pinmux, which is slightly different
> involving the definitions of a function and mappings between
> functions and one or more pin groups as per above, which is
> something completely different and seems to be what you're
> discussing here?
>
> For hardware that does handle pins in groups there are
> special functions that can be used in the drivers like
> configuring a whole group (which falls back to iterating
> over pins if there is no such callback, showing again that
> this is a theoretical concept) so if the hardware handles
> pins in groups its a good idea to match group definitions
> 1-to-1 with these, but for hardware that doesn't there is
> some freedom of how to use the groups.
>
> I don't know if this helps though the discussion here seems
> a bit contended :-/
>
It does help to me. Thanks, Linus.
--
Regards,
Shawn
next prev parent reply other threads:[~2012-01-17 2:20 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-20 17:40 [RFC PATCH v3 0/5] pinctrl: imx: add pinnmux support Dong Aisheng
2011-12-20 17:40 ` [RFC PATCH v3 1/5] dt: add of_get_child_count helper function Dong Aisheng
2011-12-20 18:35 ` Rob Herring
2011-12-21 2:56 ` Dong Aisheng-B29396
2012-01-01 13:58 ` Linus Walleij
2011-12-20 19:47 ` Marek Vasut
2011-12-21 3:27 ` Dong Aisheng-B29396
2011-12-21 6:05 ` Lothar Waßmann
2011-12-20 23:58 ` Stephen Warren
2011-12-21 3:18 ` Dong Aisheng-B29396
2011-12-20 17:40 ` [RFC PATCH v3 2/5] pinctrl: add dt binding support for pinmux mappings Dong Aisheng
2011-12-20 19:48 ` Marek Vasut
2011-12-21 0:39 ` Stephen Warren
2011-12-22 8:18 ` Dong Aisheng-B29396
2011-12-25 3:37 ` Stephen Warren
2011-12-27 14:41 ` Dong Aisheng-B29396
2011-12-29 2:46 ` Shawn Guo
2012-01-05 13:14 ` Dong Aisheng
2012-01-05 23:45 ` Stephen Warren
2012-01-06 6:21 ` Shawn Guo
2012-01-05 23:38 ` Stephen Warren
2012-01-06 10:51 ` Dong Aisheng-B29396
2012-01-06 17:23 ` Stephen Warren
2012-01-10 7:02 ` Dong Aisheng-B29396
2012-01-05 13:47 ` Dong Aisheng
2012-01-06 1:05 ` Stephen Warren
2012-01-06 5:27 ` Shawn Guo
2012-01-06 11:33 ` Dong Aisheng-B29396
2012-01-06 13:14 ` Shawn Guo
2012-01-06 18:03 ` Stephen Warren
2012-01-07 13:54 ` Shawn Guo
2012-01-08 12:51 ` Richard Zhao
2012-01-09 1:56 ` Shawn Guo
2012-01-09 6:18 ` Simon Glass
2012-01-10 11:30 ` Dong Aisheng-B29396
2012-01-11 19:19 ` Stephen Warren
2012-01-11 18:37 ` Stephen Warren
2012-01-11 23:56 ` Shawn Guo
2012-01-11 23:59 ` Stephen Warren
2012-01-12 4:03 ` Shawn Guo
2012-01-12 7:45 ` Dong Aisheng-B29396
2012-01-11 18:28 ` Stephen Warren
2012-01-11 18:17 ` Stephen Warren
2012-01-12 3:39 ` Shawn Guo
2012-01-12 7:40 ` Dong Aisheng-B29396
2012-01-12 20:46 ` Stephen Warren
2012-01-12 21:10 ` Stephen Warren
2012-01-13 3:46 ` Shawn Guo
2012-01-13 18:16 ` Stephen Warren
2012-01-14 1:22 ` Shawn Guo
2012-01-14 18:21 ` Dong Aisheng
2012-01-16 16:08 ` Linus Walleij
2012-01-17 2:32 ` Shawn Guo [this message]
2012-01-17 19:50 ` Stephen Warren
2012-01-18 2:30 ` Shawn Guo
2012-01-19 16:55 ` Linus Walleij
2012-01-19 19:30 ` Stephen Warren
2012-01-20 17:51 ` Linus Walleij
2012-01-10 8:21 ` Dong Aisheng-B29396
2012-01-10 13:05 ` Shawn Guo
2012-01-11 19:41 ` Stephen Warren
2012-01-11 23:01 ` Shawn Guo
2012-01-11 22:58 ` Stephen Warren
2012-01-11 20:17 ` Stephen Warren
2012-01-11 23:21 ` Shawn Guo
2012-01-12 8:36 ` Dong Aisheng-B29396
2012-01-12 20:56 ` Stephen Warren
2012-01-13 3:55 ` Shawn Guo
2012-01-13 8:07 ` Dong Aisheng-B29396
2012-01-13 13:35 ` Shawn Guo
2012-01-13 13:48 ` Linus Walleij
2012-01-13 14:23 ` Shawn Guo
2012-01-13 17:11 ` Dong Aisheng
2012-01-13 18:33 ` Stephen Warren
2012-01-14 1:10 ` Shawn Guo
2012-01-17 19:35 ` Stephen Warren
2012-01-17 19:48 ` Rob Herring
2012-01-14 17:58 ` Dong Aisheng
2012-01-17 19:44 ` Stephen Warren
2012-01-01 14:07 ` Linus Walleij
2012-01-01 15:22 ` Rob Herring
2012-01-05 13:59 ` Dong Aisheng
2011-12-20 17:40 ` [RFC PATCH v3 3/5] pinctrl: imx: add pinctrl imx driver Dong Aisheng
2011-12-20 19:50 ` Marek Vasut
2011-12-21 3:09 ` Dong Aisheng-B29396
2012-01-01 14:02 ` Linus Walleij
2012-01-08 13:05 ` Richard Zhao
2012-01-09 2:08 ` Shawn Guo
2012-01-09 2:17 ` Richard Zhao
2012-01-09 6:32 ` Shawn Guo
2012-01-10 8:38 ` Richard Zhao
2012-01-10 10:43 ` Linus Walleij
2012-01-10 10:55 ` Dong Aisheng-B29396
2012-01-10 13:51 ` Shawn Guo
2012-01-11 9:28 ` Linus Walleij
2011-12-20 17:40 ` [RFC PATCH v3 4/5] ARM: imx6q: using pinmux subsystem Dong Aisheng
2011-12-20 17:40 ` [RFC PATCH v3 5/5] mmc: sdhci-esdhc-imx: " Dong Aisheng
2012-01-01 13:54 ` Linus Walleij
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