On 12/20/2011 04:32 AM, Thierry Reding wrote: > This patch series adds very rudimentary device-tree support for PWM devices. > I fully realize that this is early work and it should not be merged as is. > However I wanted to post these patches for review to make sure I'm not on a > wild-goose chase. > > 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-backlight 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 takes from Sascha's branch, > while the second patch enables each PWM chip to provide multiple PWM devices > (none of the drivers in Sascha's branch are converted yet). > > Patch 3 adds some code to lookup a PWM chip given its device-tree handle. This > code will be used later on by the pwm-backlight driver to find the PWM device > that it should be using. I did not include any binding documentation yet since > I wasn't sure the DT binding was at all sensible. > > Patch 4 was taken from the Chromium tree and is required to provide proper > clocking of the Tegra2 PWFM controller. All Chromium-specific tags have been > removed from the commit message. > > Patch 5 cleans up the clock registration for Tegra2 because patch 6 will only > instantiate one device for the PWFM controller instead of four. > > Patch 6 adds a generic PWM framework driver for the Tegra2 PWFM controller. > The code is taken from the Chromium tree with some adjustments to integrate it > with the PWM framework. > > Patch 7 implements DT-based probing in the pwm-backlight driver. Note that > this code only handles the "pwm" property (by looking up the PWM device via > the new PWM DT binding) and the "default-" and "max-brightness" properties. > Switching power to the backlight via GPIOs is not supported yet. > > [0]: http://git.pengutronix.de/?p=imx/linux-2.6.git;a=shortlog;h=refs/heads/pwmlib > > Sascha Hauer (1): > PWM: add pwm framework support > > Simon Que (1): > arm: tegra: Fix PWM clock programming > > Thierry Reding (5): > pwm: Allow chips to support multiple PWMs. > of: Add PWM support. > arm: tegra: Provide clock for only one PWM controller. > pwm: Add Tegra2 SoC support > pwm-backlight: Add rudimentary device-tree support > > .../bindings/video/backlight/pwm-backlight | 16 + > Documentation/pwm.txt | 56 ++++ > MAINTAINERS | 6 + > arch/arm/boot/dts/tegra20.dtsi | 6 + > arch/arm/mach-tegra/board-dt.c | 1 + > arch/arm/mach-tegra/clock.h | 1 + > arch/arm/mach-tegra/devices.c | 15 + > arch/arm/mach-tegra/devices.h | 1 + > arch/arm/mach-tegra/tegra2_clocks.c | 33 ++- > drivers/Kconfig | 2 + > drivers/Makefile | 1 + > drivers/of/Kconfig | 6 + > drivers/of/Makefile | 1 + > drivers/of/pwm.c | 88 ++++++ > drivers/pwm/Kconfig | 17 ++ > drivers/pwm/Makefile | 2 + > drivers/pwm/core.c | 301 ++++++++++++++++++++ > drivers/pwm/pwm-tegra.c | 274 ++++++++++++++++++ > drivers/video/backlight/Kconfig | 2 +- > drivers/video/backlight/pwm_bl.c | 70 +++++- > include/linux/of_pwm.h | 41 +++ > include/linux/pwm.h | 49 ++++ > 22 files changed, 976 insertions(+), 13 deletions(-) > create mode 100644 Documentation/devicetree/bindings/video/backlight/pwm-backlight > create mode 100644 Documentation/pwm.txt > create mode 100644 drivers/of/pwm.c > create mode 100644 drivers/pwm/Kconfig > create mode 100644 drivers/pwm/Makefile > create mode 100644 drivers/pwm/core.c > create mode 100644 drivers/pwm/pwm-tegra.c > create mode 100644 include/linux/of_pwm.h You need binding documentation for the pwm portion. Rob -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
