This series introduces a way to use pwm-backlight hooks with platforms that use the device tree through a subdriver system. It also adds support for the Tegra-based Ventana board, adding the last missing block to enable its panel. Support for other Tegra board can thus be easily added. I have something else in mind to properly support this (power sequences), but this work relies on the GPIO subsystem redesign which will take some time. The pwm-backlight subdrivers can do the job by the meantime. There are a few design points that might need to be discussed: 1) Link order is important: subdrivers register themselves in their module_init function, which must be called before pwm-backlight's probe. This forbids linking subdrivers as separate modules from pwm-backlight. 2) The subdriver's data is temporarily passed through the backlight device's driver data. This should not hurt, but maybe there is a better way to do this. 3) Subdrivers must add themselves into pwm-backlight's own of_device_id table. It would be cleaner to not have to list subdrivers into pwm-backlight's main file, but I cannot think of a way to do otherwise. Suggestions for the 3 points listed above are very welcome - in any case, I hope to make this converge into something mergeable quickly. Note that these patches are the last missing block to get a functional panel on Tegra boards. Using 3.8rc4 and these patches, the internal panel on Ventana is usable out-of-the-box. Yay. Alexandre Courbot (3): pwm-backlight: add subdriver mechanism tegra: pwm-backlight: add tegra pwm-bl driver tegra: ventana: of: add host1x device to DT arch/arm/boot/dts/tegra20-ventana.dts | 29 +++++- arch/arm/configs/tegra_defconfig | 1 + drivers/video/backlight/Kconfig | 7 ++ drivers/video/backlight/Makefile | 4 + drivers/video/backlight/pwm_bl.c | 70 ++++++++++++++- drivers/video/backlight/pwm_bl_tegra.c | 159 +++++++++++++++++++++++++++++++++ include/linux/pwm_backlight.h | 15 ++++ 7 files changed, 281 insertions(+), 4 deletions(-) create mode 100644 drivers/video/backlight/pwm_bl_tegra.c -- 1.8.1.1 -- 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
