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All these files lack a license statement, so add the default
GPL-2.0-only.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20220103120539.1730644-7-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Currently the backlight implementation stretches a brightness change over
a period of 100ms. While this is a fine default for PWM backlights, a user
might wish to change this slew time to meet other constraints or even
completely disable it for some backlight devices.
Add a parameter and provide the default value from the backlight device.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Add empty static inline function fallbacks if backlight support
is not enabled, so that drivers using the backlight don't fail to
build.
Fixes:
In function `simple_panel_ioctl':
undefined reference to `of_backlight_find'
undefined reference to `backlight_set_brightness_default'
undefined reference to `backlight_set_brightness'
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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This adds a small backlight layer. It provides a backlight device
on which the brightness parameter can be used to adjust the brightness.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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