RE: [PATCH v6 00/17] Add PWM framework and device tree support
From: Hebbar, Gururaja <hidden>
Date: 2012-06-14 12:47:13
Also in:
linux-arm-kernel, linux-devicetree
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. Regards, Gururaja