Yeah, thanks Alex. :) So this is a non power sequence version of backlight & panel enabling, isn't it? I remember we talked about this several days ago and you mentioned kernel guys want an ad-hoc version(power sequence logics inside driver, not in DT) and I believe this is it, right? I think finally I can enable Tegra30 cardhu's display after this patch merged. Mark On 01/19/2013 06:30 PM, Alexandre Courbot wrote: > 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 > -- 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
