From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Alexandre Courbot <acourbot@nvidia.com>
Cc: Stephen Warren <swarren@nvidia.com>,
Thierry Reding <thierry.reding@avionic-design.de>,
Simon Glass <sjg@chromium.org>,
Grant Likely <grant.likely@secretlab.ca>,
Rob Herring <rob.herring@calxeda.com>,
Mark Brown <broonie@opensource.wolfsonmicro.com>,
Anton Vorontsov <cbou@mail.ru>,
David Woodhouse <dwmw2@infradead.org>,
Arnd Bergmann <arnd@arndb.de>,
Leela Krishna Amudala <leelakrishna.a@gmail.com>,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fbdev@vger.kernel.org, devicetree-discuss@lists.ozlabs.org,
linux-doc@vger.kernel.org
Subject: Re: [PATCH v4 0/3] Runtime Interpreted Power Sequences
Date: Thu, 16 Aug 2012 23:47:34 +0200 [thread overview]
Message-ID: <201208162347.34810.rjw@sisk.pl> (raw)
In-Reply-To: <1345097337-24170-1-git-send-email-acourbot@nvidia.com>
On Thursday, August 16, 2012, Alexandre Courbot wrote:
> Overdue revision of this new feature, some changes required additional thought
> and rework.
>
> The most important change is in the way power sequences are expressed in the
> device tree. In order to avoid having to specify #address-cells, #size-cells and
> reg properties, the @ notation in the step names is dropped, and instead a
> fixed, sequential naming is adopted. The type of the resource used by a step is
> decided by the presence of some recognized properties:
>
> power-on-sequence {
> step0 {
> regulator = "power";
> enable;
> };
> step1 {
> delay = <10000>;
> };
> step2 {
> pwm = "backlight";
> enable;
> };
> ...
>
> To me this looks safe, clear and close to the platform data representation, but
> needs approval from DT experts.
>
> Resources are still referenced by name instead of having their phandles defined
> directly inside the sequences, as previous discussion came to the conclusion
> that doing so would require controversial changes to the regulator and PWM
> frameworks, and that having the resources declared at the device level was
> making sense logically speaking.
>
> Other changes/fixes since last revision:
> * Move to drivers/power/ (hope this is ok with the maintainers?)
> * Use microseconds for delay
> * Use devm for PWM resources and remove cleanup function as all resources are
> devm-managed
> * Remove "-gpio" suffix for GPIO reference in the driver
> * Remove params structure
> * Make power_seq structure private
> * Number of steps in a sequence is explicitly stated instead of resorting to a
> "stop" sequence step
> * Delays are a step instead of being a step parameter
> * Use flexible member arrays to limit number of memory allocations
> * Add documentation to DT bindings
>
> There was a lot of feedback on the previous version (thanks!) so if I forgot
> to address some important point, please bring it to my attention again.
>
> Alexandre Courbot (3):
> Runtime Interpreted Power Sequences
> pwm_backlight: use power sequences
> tegra: add pwm backlight device tree nodes
May I ask that the next version of this patchset be CCed to
linux-pm@vger.kernel.org?
Thanks,
Rafael
next prev parent reply other threads:[~2012-08-16 21:41 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-16 6:08 [PATCH v4 0/3] Runtime Interpreted Power Sequences Alexandre Courbot
2012-08-16 6:08 ` [PATCH v4 1/3] " Alexandre Courbot
2012-08-16 7:42 ` Thierry Reding
2012-08-16 9:19 ` Alex Courbot
2012-08-16 9:52 ` Thierry Reding
2012-08-16 10:33 ` Alex Courbot
2012-08-16 10:52 ` Thierry Reding
2012-08-16 14:14 ` Mark Brown
2012-08-16 18:38 ` Stephen Warren
2012-08-16 18:47 ` Mark Brown
2012-08-16 18:57 ` Stephen Warren
2012-08-16 19:35 ` Stephen Warren
2012-08-16 19:49 ` Thierry Reding
2012-08-16 21:10 ` Mitch Bradley
2012-08-17 23:04 ` Mark Brown
2012-08-17 8:52 ` Alex Courbot
2012-08-21 7:44 ` Tomi Valkeinen
2012-08-21 8:22 ` Alex Courbot
2012-08-21 8:33 ` Thierry Reding
2012-08-21 8:53 ` Alex Courbot
2012-08-21 8:57 ` Tomi Valkeinen
2012-08-21 9:13 ` Thierry Reding
2012-08-21 9:54 ` Tomi Valkeinen
2012-08-21 16:57 ` Mark Brown
2012-08-22 5:42 ` Thierry Reding
2012-08-24 9:24 ` Alex Courbot
2012-08-24 10:34 ` Tomi Valkeinen
2012-08-16 6:08 ` [PATCH v4 2/3] pwm_backlight: use power sequences Alexandre Courbot
2012-08-16 18:42 ` Stephen Warren
2012-08-16 6:08 ` [PATCH v4 3/3] tegra: add pwm backlight device tree nodes Alexandre Courbot
2012-08-16 18:45 ` Stephen Warren
2012-08-16 21:47 ` Rafael J. Wysocki [this message]
2012-08-17 8:54 ` [PATCH v4 0/3] Runtime Interpreted Power Sequences Alex Courbot
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=201208162347.34810.rjw@sisk.pl \
--to=rjw@sisk.pl \
--cc=acourbot@nvidia.com \
--cc=arnd@arndb.de \
--cc=broonie@opensource.wolfsonmicro.com \
--cc=cbou@mail.ru \
--cc=devicetree-discuss@lists.ozlabs.org \
--cc=dwmw2@infradead.org \
--cc=grant.likely@secretlab.ca \
--cc=leelakrishna.a@gmail.com \
--cc=linux-doc@vger.kernel.org \
--cc=linux-fbdev@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-tegra@vger.kernel.org \
--cc=rob.herring@calxeda.com \
--cc=sjg@chromium.org \
--cc=swarren@nvidia.com \
--cc=thierry.reding@avionic-design.de \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).