Re: [PATCH v6 00/17] Add PWM framework and device tree support

[Thierry Reding <thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>]

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On Thu, Jun 14, 2012 at 12:47:13PM +0000, Hebbar, Gururaja wrote:
> On Tue, Apr 10, 2012 at 20:36:23, Thierry Reding wrote:
> > This patch series adds very rudimentary device-tree support for PWM
> > devices. With all of these patches applied (plus one board-specific
> > patch that is not included), I'm able to control the backlight on the
> > device I'm working on using the sysfs interface provided by the pwm-bl
> > driver and the backlight class.
> > 
> > This series is based on Sascha Hauer's series of patches[0] to add a
> > generic PWM framework. The first patch in this series is taken from
> > Sascha's branch, while the second patch enables each PWM chip to provide
> > multiple PWM devices (the Blackfin and PXA drivers have been ported to
> > the framework for reference). Currently a global namespace is still
> > provided to keep backwards-compatibility with the legacy PWM API. In
> > order to achieve this, the number of global PWM devices is limited to
> > 1024. However, patch 2 introduces per-chip indexing of PWM devices in
> > the core and patch 4 adds an API to request a PWM device using a lookup
> > table registered by board setup code. They are supposed to eventually
> > replace pwm_request() and allow to get rid of the global namespace. The
> > device tree support code does not use the global namespace.
> > 
> ..snip..
> ..snip..
> 
> > 
> > The whole series is based on the linux-next tree from 20120405. I think
> > I've addressed all of the concerns raised in the first five versions. I
> > have also pushed this version of the series to the PWM subsystem
> > repository[1].
> > 
> > Thierry
> > 
> > [0]: http://git.pengutronix.de/?p=imx/linux-2.6.git;a=shortlog;h=refs/heads/pwmlib
> > [1]: http://gitorious.org/linux-pwm/linux-pwm/trees/pwm-v6
> > 
> > Sascha Hauer (4):
> >   pwm: Add PWM framework support
> >   ARM i.MX: Move i.MX pwm driver to pwm framework
> >   ARM Samsung: Move s3c pwm driver to pwm framework
> >   ARM vt8500: Move vt8500 pwm driver to pwm framework
> > 
> > Shawn Guo (1):
> >   pwm: add pwm-mxs support
> > 
> > Simon Que (1):
> >   ARM: tegra: Fix PWM clock programming
> > 
> > Thierry Reding (11):
> >   pwm: Allow chips to support multiple PWMs
> >   pwm: Add debugfs interface
> >   pwm: Add table-based lookup for static mappings
> >   pwm: Add device tree support
> >   ARM: tegra: Provide clock for only one PWM controller
> >   pwm: Add NVIDIA Tegra SoC support
> >   pwm: tegra: Add device tree support
> >   pwm: Move Blackfin PWM driver to PWM framework
> >   pwm: Move PXA PWM driver to PWM framework
> >   pwm-backlight: Add rudimentary device tree support
> >   pwm: Take over maintainership of the PWM subsystem
> > 
> 
> I am planning to add PWM support in Linux for TI AM335x SOC. 
> I am taking your new PWM framework as reference.
> 
> I see a lot of ack's for the patches. I see that you are maintaining these patches in a separate repo.
> However, I couldn't find any of these 
> patches in the mainline kernel (including recent 3.5-rc2). 
> Do you have any plans for pushing this again to mainline kernel. 

Yes, as a matter of fact I'm in the process of getting the series ready for
inclusion into linux-next. I expect them to go into 3.6.

Thierry

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