Widening audience for this version. The issue addressed is that the power sequences for backlights (and probably other devices), which were implemented using board-specific callbacks so far, could not be used with the device tree. This series of patches adds a small power sequence interpreter that allows to acquire and control regulators, GPIOs, and PWMs during sequences defined in the device tree or as platform data. It is easy to use, low-footprint, and takes care of managing the resources it acquires. This should help making the kernel less board-dependant.
Comments are especially welcome about the DT bindings proposal, which most certainly needs to be refined, if not completely redesigned. Documentation is still incomplete and will consolidate once the implementation reaches a stable state. The tegra device tree nodes of patch 3 are just here as an example usage. Changelog: v3: - Move to driver to base/ - Use sub-nodes to describe steps in the DT as suggested by Simon Glass - Write some documentation - Make the DT support optional Alexandre Courbot (3): runtime interpreted power sequences pwm_backlight: use power sequences tegra: add pwm backlight device tree nodes .../bindings/video/backlight/pwm-backlight.txt | 55 +++- Documentation/power/power_seq.txt | 120 +++++++++ arch/arm/boot/dts/tegra20-ventana.dts | 53 ++++ arch/arm/boot/dts/tegra20.dtsi | 2 +- drivers/base/Kconfig | 4 + drivers/base/Makefile | 1 + drivers/base/power_seq.c | 300 +++++++++++++++++++++ drivers/video/backlight/Kconfig | 1 + drivers/video/backlight/pwm_bl.c | 213 +++++++++++---- include/linux/power_seq.h | 139 ++++++++++ include/linux/pwm_backlight.h | 18 +- 11 files changed, 843 insertions(+), 63 deletions(-) create mode 100644 Documentation/power/power_seq.txt create mode 100644 drivers/base/power_seq.c create mode 100644 include/linux/power_seq.h -- 1.7.11.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
