From: Linus Walleij <linus.walleij@linaro.org>
To: Stephen Warren <swarren@wwwdotorg.org>
Cc: Christian Ruppert <christian.ruppert@abilis.com>,
Patrice CHOTARD <patrice.chotard@st.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Grant Likely <grant.likely@secretlab.ca>,
Rob Herring <rob.herring@calxeda.com>,
Rob Landley <rob@landley.net>,
Sascha Leuenberger <sascha.leuenberger@abilis.com>,
Pierrick Hascoet <pierrick.hascoet@abilis.com>,
"devicetree-discuss@lists.ozlabs.org"
<devicetree-discuss@lists.ozlabs.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
Alexandre Courbot <acourbot@nvidia.com>
Subject: Re: [PATCH 2/2] Make non-linear GPIO ranges accesible from gpiolib
Date: Tue, 25 Jun 2013 16:32:52 +0200 [thread overview]
Message-ID: <CACRpkdaPJaZb7z+ua91MJ_krDRXGSaZS_5_3vHc7VcAFjUfdfQ@mail.gmail.com> (raw)
In-Reply-To: <51C4C2ED.5090505@wwwdotorg.org>
On Fri, Jun 21, 2013 at 11:17 PM, Stephen Warren <swarren@wwwdotorg.org> wrote:
> On 06/20/2013 05:57 AM, Christian Ruppert wrote:
> The Linux pinctrl subsystem specifically doesn't provide mutual
> exclusion between "mux function" and GPIO usage within a pin group,
> although perhaps a driver could internally.
It used to block this at one point. But it doesn't make sense
when the hardware looks like so:
>> +- SPI
>> Physical pins --- GPIO --- pinctrl -+- I2C
>> +- mmc
As in this case it is perfectly legal to enable the GPIO as
input while the I2C bus is running and "spy" on the signals.
The driver should probably not allow the GPIO output to be
driven while some peripheral is muxed in though, that could be
disastrous...
Yours,
Linus Walleij
next prev parent reply other threads:[~2013-06-25 14:32 UTC|newest]
Thread overview: 200+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-10 15:45 [PATCH 1/2] pinmux: Add TB10x pinmux driver Christian Ruppert
2013-04-10 15:45 ` [PATCH 2/2] GPIO: Add TB10x GPIO driver Christian Ruppert
2013-04-17 15:13 ` Linus Walleij
2013-04-17 15:13 ` Linus Walleij
2013-04-17 18:37 ` Stephen Warren
2013-04-17 14:48 ` [PATCH 1/2] pinmux: Add TB10x pinmux driver Linus Walleij
2013-04-17 14:48 ` Linus Walleij
2013-04-17 18:32 ` Stephen Warren
2013-04-18 9:03 ` Christian Ruppert
2013-04-26 7:47 ` Linus Walleij
2013-04-26 7:47 ` Linus Walleij
2013-04-29 16:17 ` Christian Ruppert
2013-04-29 16:17 ` Christian Ruppert
2013-05-02 18:49 ` Stephen Warren
2013-05-02 18:49 ` Stephen Warren
2013-05-03 18:03 ` Linus Walleij
2013-05-03 18:03 ` Linus Walleij
2013-05-08 16:41 ` Christian Ruppert
2013-05-08 16:41 ` Christian Ruppert
2013-05-08 20:01 ` Stephen Warren
2013-05-08 20:01 ` Stephen Warren
2013-05-10 8:25 ` Christian Ruppert
2013-05-10 8:25 ` Christian Ruppert
2013-05-14 12:29 ` Linus Walleij
2013-05-14 12:29 ` Linus Walleij
2013-05-15 9:41 ` Christian Ruppert
2013-05-15 9:41 ` Christian Ruppert
2013-05-20 8:03 ` Linus Walleij
2013-05-20 8:03 ` Linus Walleij
2013-05-22 9:49 ` Christian Ruppert
2013-05-22 9:49 ` Christian Ruppert
2013-06-12 16:44 ` [RFC] Allow GPIO ranges based on pinctl pin groups Christian Ruppert
2013-06-13 9:00 ` Linus Walleij
2013-06-13 9:00 ` Linus Walleij
2013-06-13 12:55 ` [PATCH 1/2] Add pin list based GPIO ranges Christian Ruppert
2013-06-13 18:30 ` Linus Walleij
2013-06-13 18:30 ` Linus Walleij
2013-06-14 7:17 ` Patrice CHOTARD
2013-06-14 7:17 ` Patrice CHOTARD
2013-06-14 8:24 ` [PATCH] Fix comment on pinctrl_gpio_range.pin_base Christian Ruppert
2013-06-16 10:19 ` Linus Walleij
2013-06-16 10:19 ` Linus Walleij
2013-06-13 12:55 ` [PATCH 2/2] Make non-linear GPIO ranges accesible from gpiolib Christian Ruppert
2013-06-13 18:36 ` Linus Walleij
2013-06-13 18:36 ` Linus Walleij
2013-06-13 21:38 ` Stephen Warren
2013-06-14 9:12 ` Christian Ruppert
2013-06-19 18:10 ` Stephen Warren
2013-06-19 18:27 ` Stephen Warren
2013-06-20 11:57 ` Christian Ruppert
2013-06-21 21:17 ` Stephen Warren
2013-06-25 11:59 ` Christian Ruppert
2013-06-25 15:59 ` Stephen Warren
2013-06-25 14:27 ` Linus Walleij
2013-06-25 14:27 ` Linus Walleij
2013-06-25 15:19 ` Stephen Warren
2013-06-25 15:19 ` Stephen Warren
2013-06-25 14:32 ` Linus Walleij [this message]
2013-06-25 14:32 ` Linus Walleij
2013-06-25 15:22 ` Stephen Warren
2013-06-25 15:22 ` Stephen Warren
2013-06-25 14:56 ` Linus Walleij
2013-06-25 14:56 ` Linus Walleij
2013-06-25 15:31 ` Stephen Warren
2013-06-25 15:31 ` Stephen Warren
2013-06-25 15:47 ` Linus Walleij
2013-06-25 15:47 ` Linus Walleij
2013-06-25 15:28 ` Linus Walleij
2013-06-25 15:28 ` Linus Walleij
2013-06-25 15:39 ` Stephen Warren
2013-06-25 15:39 ` Stephen Warren
2013-06-25 15:53 ` Linus Walleij
2013-06-25 15:53 ` Linus Walleij
2013-06-17 16:03 ` Christian Ruppert
2013-06-17 16:04 ` [PATCH 1/4] " Christian Ruppert
2013-06-18 8:09 ` Linus Walleij
2013-06-18 8:09 ` Linus Walleij
2013-06-18 9:25 ` Christian Ruppert
2013-06-18 9:25 ` Christian Ruppert
2013-06-18 9:29 ` Christian Ruppert
2013-06-19 12:03 ` Linus Walleij
2013-06-19 12:03 ` Linus Walleij
2013-06-19 18:15 ` Stephen Warren
2013-06-19 18:15 ` Stephen Warren
2013-06-26 11:42 ` Christian Ruppert
2013-06-26 11:42 ` Christian Ruppert
2013-06-26 17:33 ` Stephen Warren
2013-06-26 17:33 ` Stephen Warren
2013-06-19 22:27 ` Stephen Warren
2013-06-26 11:46 ` Christian Ruppert
2013-06-26 17:34 ` Stephen Warren
2013-06-18 9:29 ` [PATCH 2/4] pinmux: Add TB10x pinmux driver Christian Ruppert
2013-06-19 22:35 ` Stephen Warren
2013-06-26 11:50 ` Christian Ruppert
2013-06-26 17:40 ` Stephen Warren
2013-07-05 9:49 ` Christian Ruppert
2013-07-05 18:40 ` Stephen Warren
2013-07-08 13:02 ` Christian Ruppert
2013-07-10 19:27 ` Stephen Warren
2013-07-16 8:47 ` Christian Ruppert
2013-07-16 16:04 ` Stephen Warren
2013-07-18 16:07 ` Christian Ruppert
2013-07-18 19:54 ` Stephen Warren
2013-07-26 9:42 ` Christian Ruppert
2013-07-26 16:05 ` Stephen Warren
2013-07-29 22:35 ` Linus Walleij
2013-08-05 11:51 ` Christian Ruppert
2013-08-05 11:51 ` Christian Ruppert
2013-08-14 16:53 ` Linus Walleij
2013-08-21 15:57 ` Christian Ruppert
2013-08-22 20:10 ` Stephen Warren
2013-08-28 14:47 ` Christian Ruppert
2013-10-08 12:21 ` Christian Ruppert
2013-10-08 12:25 ` [PATCH 01/03] Make non-linear GPIO ranges accesible from gpiolib Christian Ruppert
2013-10-09 11:58 ` Linus Walleij
2013-10-09 13:28 ` Christian Ruppert
2013-10-09 14:01 ` Linus Walleij
2013-10-10 20:49 ` Stephen Warren
2013-10-11 7:53 ` Linus Walleij
2013-10-15 13:36 ` Christian Ruppert
2013-10-15 13:37 ` [PATCH V2] " Christian Ruppert
2013-10-16 11:19 ` Linus Walleij
2013-10-16 12:56 ` [PATCH] Add a short note on pinctrl_get_group_pins to pinctrl.txt Christian Ruppert
2013-10-16 13:36 ` Linus Walleij
2013-10-10 20:47 ` [PATCH 01/03] Make non-linear GPIO ranges accesible from gpiolib Stephen Warren
2013-10-08 12:25 ` [PATCH 02/03] pinmux: Add TB10x pinmux driver Christian Ruppert
2013-10-09 12:30 ` Linus Walleij
2013-10-15 13:39 ` [PATCH V2] " Christian Ruppert
2013-10-15 13:39 ` Christian Ruppert
2013-10-16 11:25 ` Linus Walleij
2013-10-08 12:25 ` [PATCH 03/03] GPIO: Add TB10x GPIO driver Christian Ruppert
2013-10-09 12:19 ` Linus Walleij
2013-10-15 13:45 ` Christian Ruppert
2013-10-16 11:29 ` Linus Walleij
2013-10-16 12:58 ` Christian Ruppert
2013-10-24 16:23 ` Christian Ruppert
2013-10-25 21:44 ` Linus Walleij
2013-10-25 3:27 ` Kumar Gala
2013-08-28 18:49 ` [PATCH 2/4] pinmux: Add TB10x pinmux driver Linus Walleij
2013-08-29 7:35 ` Christian Ruppert
2013-08-29 8:24 ` Linus Walleij
2013-08-30 8:19 ` Christian Ruppert
2013-06-18 9:29 ` [PATCH 3/4] GPIO: Add TB10x GPIO driver Christian Ruppert
2013-06-19 22:37 ` Stephen Warren
2013-06-18 9:29 ` [PATCH 4/4] Add Abilis Systems Sarl to device tree vendor prefixes Christian Ruppert
2013-06-17 16:04 ` [PATCH 2/4] pinmux: Add TB10x pinmux driver Christian Ruppert
2013-06-17 16:04 ` [PATCH 3/4] GPIO: Add TB10x GPIO driver Christian Ruppert
2013-06-17 16:04 ` [PATCH 4/4] Add Abilis Systems Sarl to device tree vendor prefixes Christian Ruppert
2013-05-16 0:12 ` [PATCH 1/2] pinmux: Add TB10x pinmux driver Stephen Warren
2013-05-16 0:12 ` Stephen Warren
2013-05-20 8:10 ` Linus Walleij
2013-05-20 8:10 ` Linus Walleij
2013-05-22 14:28 ` Christian Ruppert
2013-05-22 14:28 ` Christian Ruppert
2013-05-23 7:43 ` Haojian Zhuang
2013-05-23 7:43 ` Haojian Zhuang
2013-05-24 11:50 ` Christian Ruppert
2013-05-24 11:50 ` Christian Ruppert
2013-05-26 15:49 ` Haojian Zhuang
2013-05-26 15:49 ` Haojian Zhuang
2013-06-03 12:30 ` Christian Ruppert
2013-06-03 12:30 ` Christian Ruppert
2013-06-05 1:44 ` Haojian Zhuang
2013-06-05 1:44 ` Haojian Zhuang
2013-06-06 14:11 ` Christian Ruppert
2013-06-06 14:11 ` Christian Ruppert
2013-06-06 14:32 ` Haojian Zhuang
2013-06-06 14:32 ` Haojian Zhuang
2013-06-06 15:30 ` Christian Ruppert
2013-06-06 15:30 ` Christian Ruppert
2013-06-07 0:00 ` Haojian Zhuang
2013-06-07 0:00 ` Haojian Zhuang
2013-06-07 11:32 ` Christian Ruppert
2013-06-07 11:32 ` Christian Ruppert
2013-06-07 14:57 ` Haojian Zhuang
2013-06-07 14:57 ` Haojian Zhuang
2013-06-07 19:18 ` Stephen Warren
2013-06-07 19:18 ` Stephen Warren
2013-06-08 8:31 ` Haojian Zhuang
2013-06-08 8:31 ` Haojian Zhuang
2013-06-09 2:47 ` Stephen Warren
2013-06-09 2:47 ` Stephen Warren
2013-06-11 7:27 ` Christian Ruppert
2013-06-11 7:27 ` Christian Ruppert
2013-06-16 11:11 ` Linus Walleij
2013-06-16 11:11 ` Linus Walleij
2013-05-29 12:21 ` Linus Walleij
2013-05-29 12:21 ` Linus Walleij
2013-06-03 9:42 ` Christian Ruppert
2013-06-03 9:42 ` Christian Ruppert
2013-06-07 11:36 ` Linus Walleij
2013-06-07 11:36 ` Linus Walleij
2013-06-07 13:34 ` Christian Ruppert
2013-06-07 13:34 ` Christian Ruppert
2013-05-24 9:20 ` Linus Walleij
2013-05-24 9:20 ` Linus Walleij
2013-05-24 12:03 ` Christian Ruppert
2013-05-24 12:03 ` Christian Ruppert
2013-05-02 18:52 ` Stephen Warren
2013-05-02 18:52 ` Stephen Warren
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CACRpkdaPJaZb7z+ua91MJ_krDRXGSaZS_5_3vHc7VcAFjUfdfQ@mail.gmail.com \
--to=linus.walleij@linaro.org \
--cc=acourbot@nvidia.com \
--cc=christian.ruppert@abilis.com \
--cc=devicetree-discuss@lists.ozlabs.org \
--cc=grant.likely@secretlab.ca \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=patrice.chotard@st.com \
--cc=pierrick.hascoet@abilis.com \
--cc=rob.herring@calxeda.com \
--cc=rob@landley.net \
--cc=sascha.leuenberger@abilis.com \
--cc=swarren@wwwdotorg.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.